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i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 1 of 33 all rights reserved november 2012 IQS128 / IQS128l datasheet iq switch ? - proxsense ? series single channel capacitive proximity/touch controller the IQS128 / IQS128l proxsense ? ic is a ful ly integrated capacitive sensor implementing dynamic calib ration (dycal?) technology : intelligent hysteresis to allow for sensor drift even during sensor activation. features dycal? : intelligent hysteresis i nternal c apacitor i mplementation (ici ) C reference capacitor on - chip a utomatic t uning i mplementation ( ati) - automatic adjustment for optimal sensor performance supply voltage: 2.95 v to 5 .5 v minimum external components 1 - wire open drain d ata streaming option advanced o n - chip digital signal processing user selectable (otp) : external synchronisation contr ol or external control over filter operation i / o s ink or s ource selection time - out for stuck key proximity and touch sensitivity selections IQS128l : low power options available keys: touch: 5mm x 5mm or larger (overlay thickness dependent) proximity: va rious electrical options (wire / pcb trace / ito / conductive foil) dielectric: material: various non - metal materials (i.e. glass, plastic, painted surfaces) thickness: 6 mm plastic, 10 mm glass for touch. very thick overlay possible for proximity applications occupancy sensors sar qualification for tablet pcs on - ear detection for mobile phones 3d glasses personal media players white goods and appliances human interface devices proximity activated backlighting any applications where a touch and proximity condition can prevail for a n extended period of time with or without a host controller a dvantages a llows for sensor drift in periods of activation and non - activation improved digital filtering to reduce external noise m inimal power consumption (<7a) when in standby mode ( charge halt) . available options t a tsot23 - 6 d fn8 (2x3) - 40 c to 85 c iq s128 IQS128l IQS128l d fn8 (2x3) IQS128 tsot23 - 6 free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 2 of 33 all rights reserved november 2012 contents 1 overview ................................ ................................ ................................ ................................ ......................... 4 1.1 d evice variations ................................ ................................ ................................ ................................ ................ 4 1.2 d evice ................................ ................................ ................................ ................................ ................................ . 4 1.3 o peration ................................ ................................ ................................ ................................ ........................... 4 1. 4 a pplicability ................................ ................................ ................................ ................................ ........................ 4 2 pin - out ................................ ................................ ................................ ................................ ............................. 5 2.1 IQS128 ................................ ................................ ................................ ................................ ............................... 5 2.1.1 pin - out ................................ ................................ ................................ ................................ ........................... 5 2.1.2 schematic ................................ ................................ ................................ ................................ ...................... 5 2.1.3 typical values ................................ ................................ ................................ ................................ ................ 5 2.2 IQS128l ................................ ................................ ................................ ................................ ............................. 6 2.2.1 pin - out ................................ ................................ ................................ ................................ ........................... 6 2.2.2 schematic ................................ ................................ ................................ ................................ ...................... 6 2.2.1 typical values ................................ ................................ ................................ ................................ ................ 6 3 user configurable op tions ................................ ................................ ................................ .......................... 7 3.1 c onfiguring d evices ................................ ................................ ................................ ................................ ........... 7 3.1.1 IQS128 user selectable options ................................ ................................ ................................ .................... 7 3.1.2 IQS128l user selectable options ................................ ................................ ................................ .................. 9 4 measuring capacitanc e using the charge transfer method ................................ ............................... 11 5 dycal? ................................ ................................ ................................ ................................ ............................. 12 5.1 o perating p rinciple ................................ ................................ ................................ ................................ .......... 13 5.2 n on - t ouch m ode ................................ ................................ ................................ ................................ ............. 13 5.3 t ouch m ode ................................ ................................ ................................ ................................ ..................... 1 3 6 configurable setting s ................................ ................................ ................................ ................................ . 14 6.1 ext_ctrl: e xternal c ontrol ................................ ................................ ................................ ............................ 14 6.1.1 charge halt ................................ ................................ ................................ ................................ ................. 14 6.1.2 halt lta filter ................................ ................................ ................................ ................................ .............. 14 6.1.3 pulse on ctrl: ................................ ................................ ................................ ................................ ............. 14 6.2 logic ................................ ................................ ................................ ................................ ............................... 15 6.3 rf n oise on IQS128/IQS128l ................................ ................................ ................................ ............................ 15 6.3.1 nd: rf nois e detection (IQS128) ................................ ................................ ................................ ................ 15 6.3.2 IQS128/IQS128l rf noise immunity ................................ ................................ ................................ ........... 15 6.4 p thr[1:0] p roximity t hreshold ................................ ................................ ................................ ............................. 15 6.5 t thr[2:0] t ouch t hreshold ................................ ................................ ................................ ................................ ... 16 6.6 ctrl_direction ................................ ................................ ................................ ................................ ............. 16 6.7 t halt[1:0] f ilter h alt ................................ ................................ ................................ ................................ ........... 17 6.8 lp [1:0] l ow p ower m odes (IQS128l) ................................ ................................ ................................ .................. 17 7 streaming mode ................................ ................................ ................................ ................................ ............ 18 8 automa tic tuning implement ation (ati) ................................ ................................ ................................ .. 19 8.1 ati ................................ ................................ ................................ ................................ ................................ ... 19 8.1.1 ati target ................................ ................................ ................................ ................................ .................... 19 8.1.2 ati base : significance of ati base ................................ ................................ ................................ .................. 19 8.2 s ensitivity due to ati ................................ ................................ ................................ ................................ ........ 20 8.3 ati p rocedure ................................ ................................ ................................ ................................ .................. 20 9 dycal specific setti ngs ................................ ................................ ................................ ................................ . 21 9.1 rel_t thr : r elease t hreshold (IQS128l) ................................ ................................ ................................ ............ 21 9.2 dycal_output (iq s128l) ................................ ................................ ................................ ............................. 21 free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 3 of 33 all rights reserved november 2012 10 electrical specifica tions ................................ ................................ ................................ ............................. 22 10.1 a bsolute m aximum s pecifications ................................ ................................ ................................ ..................... 22 10.2 g eneral c haracteristics (m easured at 25c) ................................ ................................ ................................ ..... 22 10.3 o utput c haracteristics (m easured at 25c) ................................ ................................ ................................ ...... 23 10.4 t imi ng c haracteristics ................................ ................................ ................................ ................................ ...... 23 11 packaging and part - number information ................................ ................................ .............................. 25 11.1 p ackaging i nformation ................................ ................................ ................................ ................................ ..... 25 11.1.1 tsot23 - 6 ................................ ................................ ................................ ................................ ................ 25 11.1.2 tsot23 - 6 tape ................................ ................................ ................................ ................................ ........ 26 11.1.3 dfn8 (2x3) ................................ ................................ ................................ ................................ .............. 26 11.1.4 dfn8 tape ................................ ................................ ................................ ................................ .............. 27 11.1.5 moister sensitivity level (msl) ................................ ................................ ................................ ............... 28 11.2 d evice p ackaging c onvention ................................ ................................ ................................ ........................... 29 11.2.1 IQS128 ................................ ................................ ................................ ................................ .................... 29 11.2.2 IQS128l ................................ ................................ ................................ ................................ ................... 29 11.3 o rdering i nformation ................................ ................................ ................................ ................................ ...... 30 11.3.1 IQS128 ................................ ................................ ................................ ................................ .................... 30 11.3.2 IQS128l ................................ ................................ ................................ ................................ ................... 30 12 errata ................................ ................................ ................................ ................................ ............................. 31 13 datasheet revision h istory ................................ ................................ ................................ ......................... 32 14 contact information ................................ ................................ ................................ ................................ .. 33 free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 4 of 33 all rights reserved november 2012 1 overview 1.1 device variations functionality devi ce package dycal lp modes rf noise detection pulse on ctrl ( i nput) dycal output ati base touch debounce release threshold filter operation block ati IQS128 tsot23 - 6 75% normal - - available reseed t out 4 values 3 IQS128l d fn8(2x3) 75% & 87. 5% up dated 3sec after exiting tm 4 power modes - re - ati p out or t out 8 values 2 please note: except for the functional variations stated above , there also exist differences between the proximity and touch thresholds for the IQS128l version. more on this in sec tions 6.4 & 6.5 . 1.2 device the IQS128 and IQS128l ics will be referred to as IQS128/IQS128l throughout the datasheet, unless they have different functionality, where it will be explicitly stated an d explained. t he IQS128/IQS128l is a single channel capacitive proximity and touch device which employ s an internal voltage regul ato r and reference capacitor (cs). the IQS128/IQS128l device has a dedicated pin for the connection of a sense electrode (cx) a nd output pin for proximity and touch ev ents on out . the polarity of the output pins can be configured . a 1 - wire open drain data streaming protocol is implemented for debugging purposes. special d evice configuration can be done by setting one time programm able (otp) options. the device automatically track s slow varying environmental changes via various signal processing algorithms and has an a utomatic tuning implementation (ati) algorithm to calibrate the device to the sense electrode . dycal? (dynamic ca libration) is a special form of hysteresis that can track slow varying environmental change even while the sensor is in a touch state. the charge transfer method of capacitive sensing is employed on the IQS128/IQS128l . (the c harge transfer principle is th oroughly described in the application note: azd004 - azoteq capacitive sensing. ) 1.3 operation the device has been designed to be used in applications where proximity is required and touch condition s can prevail for an extended period of time which may re sult in uncompensated drift in conventional capacitive sensors . a low threshold is used to detect the proximity of an object , with a higher threshold for touch detection . dynamic calibration is performed when a touch condition is detected for longer than t d ynacal . the hysteresis algorithm will now check for the release condition of the touch, while still tracking environmental changes 1.4 applicability all specifications , except where specifically mentioned otherwi se, provided by this datasheet are applicable to the following ranges : temperature : - 40c to +85c supply voltage (v ddhi ) : 2 .95 v to 5 .5 v free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 5 of 33 all rights reserved november 2012 2 pin - o ut the iqs12 8 is available in a tsot23 - 6 package and the IQS128l is available in a d fn8(2x3) package . 2.1 iqs1 28 2.1.1 pin - out figure 2.1 pin - out of iqs12 8 package table 2.1 pin - out descri p tion iqs12 8 pin name type function 1 out digital out output 2 v ss ground gnd reference 3 ctrl / nd digital input /output control i nput or proximity output / nd pin 4 v reg analogue o utput internal regulator pin (connect 1 f bypass c apacitor) 5 v ddhi supply input supply voltage input 6 c x analogue sense electrode 2.1.2 schematic figure 2.2 typical application schematic of iqs12 8 2.1.3 typical values component value c vreg 1uf r cx 470 ? ( typ ical) r pu * 4.7 k ? ( typ ical) c vddhi 1uf * r pu is only needed if device is setup in active low state. 128xx vddhi cx v ss vddhi v reg v reg out out ctrl/nd vss cx ctrl / nd vddhi 1 vddhi 2 c vdd hi 3 c vreg 6 note: a 100pf capacitor can be places in parallel with the existing capacitors between vddhi and gnd as well as between vreg and gnd for added rf immunity. 5 gnd 4 gnd IQS128 r cx r pu sense electrode ctrl input/output output free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 6 of 33 all rights reserved november 2012 2.2 IQS128l 2.2.1 pin - out figure 2.3 pin - out of IQS128l package table 2.2 pin - out descri p tion IQS128l pin name type function 1 v ddhi supply input supply voltage i nput 2 v reg analogue output internal regulator pin (connect 1 f bypass c apacitor) 3 ctrl digital input/output control input or proximity output 4 nc - no connect 5 nc - no connect 6 out digital out output 7 v ss ground gnd reference 8 cx analogue sen se electrode 2.2.2 schematic figure 2.4 typical application schematic of IQS128l 2.2.1 typical values component value c vreg 1uf r cx 470 ? ( typ ical) r pu 4.7 k ? ( typ ical) c vddhi 1uf * r pu is only needed if device is setup in active low state. IQS128 vddhi l 1 i z z z v ss 1 v reg 2 out 3 ctrl/nd 4 cx 5 vddhi 6 vddhi 7 c vddhi 8 c vreg zzzxx note: a 100pf capacitor can be places in parallel with the existing capacitors between v ddhi and gnd as well as between vreg and gnd for added rf immunity. vddhi gnd v reg gnd ctrl IQS128 l nc r cx cx r pu vss sense electrode out ctrl input/output nc output free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 7 of 33 all rights reserved november 2012 3 user configurable options table 4.1 and table 4.2 l ist the user configurable settings. the device is fully functional in its default state, but some applications may require alternative configuration settings. these settings are enabled by configuring one time programmable (otp) user options. c onfiguration can be done on packaged device s or in - circuit. in - circuit configuration may be limited by v alues of external components chosen. popular configurations are available ex - stock C please check with the local distributor for availability . azoteq can supply pre - configured devices for large quantities. 3.1 configuring d evice s azoteq offers a configuratio n tool (ct xxx ) and accompanying software (usbprog.exe) that can be used to program the otp user options for prototyping purposes. more details regarding the configuration of the device with the usbprog program is explained by application note: azd007 C u sbprog overview which can be found on the azoteq website . alterna tive programming solutions for the IQS128/IQS128l also exist . f or further enquiries regarding this, please contact azoteq at proxsensesupport@azoteq.com or the local distributor . 3.1.1 IQS128 use r selectable options table 3 - 1 : IQS128 bank 0 user selectable options bit 7 6 5 4 3 2 1 0 name t th r 2 t th r 1 t th r 0 p th r 1 p th r 0 nd logic ext_ctrl default 0 0 0 0 0 0 0 0 bit 7 - 5 t th r <2:0> : touch thresholds ( counts ) - section 6.5 000 = 16 001 = 40 010 = 60 011 = 90 100 = 130 101 = 200 110 = 340 111 = 500 b it 4 - 3 p th r < 1 :0> : proximity thresholds (counts) - section 0 00 = 4 01 = 8 10 = 12 11 = 16 b it 2 nd : rf noise detection - section 6.3.1 0 = disable rf noise detect 1 = enable rf noise detect b it 1 logic: output logic select (only when streaming mode is disabled) - section 6.7 0 = 1 software open drain active low 1 = active high bit 0 ext_ctrl: selects external control option on out - section 6.1 0 = charge halt 1 = halt lta filter 1 only applicable for out pin. if ctrl is configured as output, it is a push - pull output. free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 8 of 33 all rights reserved november 2012 table 3 - 2 : IQS128 bank 1 user selectable options bit 7 6 5 4 3 2 1 0 n ame streaming ~ ~ t halt 1 t halt 0 ~ ~ ctrl_direction default 0 0 0 0 0 0 0 0 bit 7 streaming : 1 - wire streaming protocol - section 0 0 = disabled 1 = enabled bit 6 - 5 unimplemented b it 4 - 3 t th a lt < 1 :0> : filter halt settings - section 6.7 00 = always 01 = 18s 10 = 60s 11 = 3s bit 2 - 1 unimplemented bit 0 ctrl_direction: configures control pin as input or output 0 = inpu t for external control from mcu (used with bank0 - bit 0) - section 0 1 = output mode operation table 3 - 3 : IQS128 bank 2 user selectable options bit 7 6 5 4 3 2 1 0 name ~ ~ ~ ~ ~ ati base 1 ati base 0 ~ default ~ ~ ~ ~ ~ 0 0 ~ bit 7 - 4 unimplemented b it 2 - 1 ati base < 1 :0> : base value selections - section 8.1 00 = 200 counts 01 = 100 counts 10 = 150 cou nts 11 = 250 counts bit 0 unimplemented free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 9 of 33 all rights reserved november 2012 3.1.2 IQS128l user selectable options table 3 - 4 : IQS128l bank 0 user selectable options bit 7 6 5 4 3 2 1 0 name t thr 2 t thr 1 t thr 0 p thr 1 p thr0 n d logic ext_ctrl default 0 0 0 0 0 0 0 0 bit 7 - 5 t thr <2:0> : touch thresholds (counts) - section 6.5 000 = 40 001 = 6 0 010 = 10 0 011 = 20 0 100 = 36 0 101 = 5 00 110 = 70 0 111 = 9 00 b it 4 - 3 p thr < 1 :0> : proximity thresholds (counts) - section 0 00 = 4 01 = 8 10 = 16 11 = 32 b it 2 unimplemented b it 1 logic: output logic select (only when streaming mode is disabled) - section 6.7 0 = 2 software open drain active low 1 = active high bit 0 ext_ctrl: selects external control option on out - se ction 6.1 0 = charge halt 1 = halt lta filter 2 only applicable for out pin. if ctrl is configured as output, it is a push - pull output. free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 10 of 33 all rights reserved november 2012 table 3 - 5 : IQS128l bank 1 user selectable options bit 7 6 5 4 3 2 1 0 name streaming lp 1 lp0 t halt 1 t halt 0 ~ ~ ctrl_direction default 0 0 0 0 0 0 0 0 bit 7 streaming : 1 - wire streaming protocol - section 0 0 = disabled 1 = enabled b it 6 - 5 lp < 1 :0> : low power mode timings - section 6.8 00 = 9.01ms ( boost power mode) 01 = 27ms (normal power mode) 10 = 100ms (low power mode 1) 11 = 300ms (low power mode 2) b it 4 - 3 t th alt < 1 :0> : filter halt settings - section 6.7 00 = always 01 = 18s 10 = 60s 11 = 3s bit 2 - 1 unimplemented bit 0 ctrl_direction: configures control pin as input or output 0 = input for external control from mcu (used with bank0 - bit 0) - section 0 1 = output mode operation table 3 - 6 : IQS128l bank 2 user selectable options bit 7 6 5 4 3 2 1 0 name ~ ~ dycal_output release_thres ati base 2 ati base 1 ati ba se 0 ~ default ~ ~ 0 0 0 0 ~ bit 7 - 6 unimplemented b it 5 dycal_output: out pin will react with the detection of a - section 9.2 0 = proximity 1 = touch bit4 release_thres: release thresho ld - dycal (% of touch threshold) - section 9.1 0 = 75% 1 = 87.5% b it 3 - 1 ati base <3:0 >: base value selections - section 8.1 000 = 200 counts 0 01 = 250 counts 0 10 = 300 counts 0 11 = 350 counts 100 = 400 counts 101 = 550 counts 110 = 700 counts 111 = 850 counts bit 0 unimplemented free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v 2.4 page 11 of 33 all rights reserved november 2012 4 measuring capacitance using the charge t ransfer method the charge trans fer method of capacitive sensing is employed on the IQS128/IQS128l . (the c harge transfer principle is thoroughly described in the application note: azd004 - azoteq capacitive sensing.) a c harge c ycle is used to take a measurement of the capacitance of the sense electrode (connected to cx) relative to ground. it consists of a series of pulses charging cx and discharging cx to the reference capacitor, at the charge transfer frequency (fcx - refer to section 10 ). the number of the pulses required to reach a trip voltage on the reference capacitor is referred to as c ounts (cs) which is the instantaneous capacitive measurement. the cs value is used to determine if either a physical contact or a proximity event has occurred based on the change in cs detected. the typical values of cs , without a touch or a proximity condition range between 1344 and 1 865 , although higher and lower cs can be used based on the application requirements. with cs larger than +/ - 1865 the gain of the system may become too high causing unsteady cs . the IQS128/IQS128l schedules a charge cycle every t sample seconds to ensure regular samples for processing of results. the duration of the charge cycle is defined as t charge and varies according to the cs required to reach the trip voltage. other activities, such as data streaming (if device is in streaming mode), are completed between charge cycle s. please note: attaching a probe to the cx pin will increase the capacitance of the electrode and t herefore the cs . this may have an immediate influence on the cs (decrease t charge C thus cs ) and cause a proximity or a touch event. after t halt seconds the system will adjust to accommodate for this change. if the total load on cx, with the probe attached is still lower than the maximum cx load the system will continue to function normally after t halt seconds with the probe attached. figure 4.1 charge cycles as can be see on cx figure 4.2 charge cycles as charged in lp modes ( IQS128l only) c x p i n 1 2 3 4 t c h a r g e t s a m p l e c x p i n 1 2 t l p _ c h a r g e t l p 3 free datasheet http:///
i q switch ? proxsense ? series copyright ? azote q (pty) ltd 20 11 IQS128 & IQS128lp datasheet v2.2 page 12 of 33 all rights reserved november 2012 5 dycal? figure 5.1 dycal operation p t h r t t h r c s i q s 1 2 8 : r e l _ t t h r = 7 5 % i q s 1 2 8 l p : r e l _ t t h r = 7 5 % o r 8 7 . 5 % 1 0 o u t r e c a l l i b r a t e l t a c s l t a C l o n g t e r m a v e r a g e o f c s p t h r - d e r i v e d f r o m l t a t t h r - d e r i v e d f r o m l t a 1 . i f t o u c h p a d i s a p p r o a c h e d i n n o n - t m : c s g o e s b e l o w l t a , i f c s g o e s b e l o w p t h , o u t = h i g h & l t a w i l l h a l t ( n o t a l l o w e d t o t r a c k c s ) , i f c s g o e s b e l o w t t h , o u t w i l l s t a y h i g h & l t a w i l l r e c a l i b r a t e d e v i c e w i l l e n t e r t m ( t o u c h m o d e ) & o u t w i l l s t a y h i g h t m : t o u c h m o d e t m n o n - t m n o n - t m n o n - t m : n o n - t o u c h m o d e 2 . i f t o u c h p a d i s r e l e a s e d i n t m : l t a w i l l t r a c k c s a s l o n g a s c s i s b e l o w p t h r c s g o e s a b o v e l t a i f c s g o e s a b o v e p t h r , l t a w i l l h a l t , i f c s g o e s a b o v e r e l _ t t h r , o u t w i l l g o l o w & l t a w i l l r e c a l i b r a t e l t a i s a l l o w e d t o t r a c k c s l t a & free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v2.2 pag e 13 of 33 all rights reserved november 2012 5.1 o perating principle figure 5.1 is a visual representation of the dycal functionality. the out pin is used to indicate the st atus of a dycal event ( both a proximity and a touch e vent ) . the dycal functionality is summarised below. 5.2 non - touch mode the out pin is activated on the successful detection of a proximity event and will remain activated for the duration of the proximity event , permitting that this event is not longer than the f ilter halt timings. the lta will be halted in this time. as soon as a touch condition is detected ( cs below t thr ) , the controller will dynamically re - calibrate its lta to the halted lta C t th r . the ic is now in touch mode. 5.3 touch mode after the re - calibrati on of the lta , it will follow the cs and be allowed to track slow varying environmental changes . if the cs were to exceed the lta by a release threshold (rel_t th r ) the touch detection will stop and the out pin will return to its original state . free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 1 1 IQS128 & IQS128lp datasheet v2.2 pag e 14 of 33 all rights reserved november 2012 6 c onfigur able settings th is section describes the user configurable options of the IQS128/IQS128l in more detail. user programmable options are selected by configuring the otp selections. please refer to section 3 for an overview of the configurable settings. 6.1 ext_ctrl: external control the user has the option to control some parameters of the IQS128/IQS128l from an external source. the ic can be used in default mode (ctrl unconnected) or the user can use the ctrl pin to select whether the master should halt the charge transfer s ( i.e. stop operation) or to halt lta filter tracking on the IQS128/IQS128l . 6.1.1 charge halt if ctrl is sampled high for longer than t ext_halt, the charge conversion cycle will be halted, once the current conversion has been completed. the device will remain in this standby mode until the ctrl line is sampled low again. an automatic reseed is performed directly after ctrl is released to compensate for any environmental changes which might have occurred during the stan dby mode. 6.1.2 halt lta filter when configured in this mode, ctrl can be used to control the lta halt times when sampled high. the ctrl pin has precedence over the configurations bits selected for the halt timings. if ctrl is sampled high for longer than t ext _ h alt , the filter will be halted until this pin is sampled low. . figure 6.1 master output signal on ctrl pin to halt operation or filter halt 6.1.3 pulse on ctrl: the pulse on the ctrl pin needs to adhere to the following timing constraints: 2 5 ms < t pulse < 35 ms 6.1.3.1 IQS128: reseed a reseed condition can be initiated by generating a pulse on the ctrl pin. the lta will be reset to the cs , forcing the out pin to its original state. if the cs value is outside its allowable limits, the device will forc e an ati event to reset the system sensitivity. (please refer to section 8 for more detail). 6.1.3.2 IQS128l : re - ati a re - ati condition can be initiated by generating a pulse on the ctrl pin. this function can be issued at any time. figure 6.2 master output signal on ctrl to force a reseed condition c t r l 1 0 t e x t - h a l t c t r l 1 0 t p u l s e free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 15 of 33 all rights reserved november 2012 6.2 l ogic the logic used by the device can be selected as a ctive high or a ctive low . the output pins out and ctrl will function based on this selection . confi guration: bank0 bit1: logic output selection bit selection 0 software open drain active low 1 active high a software open drain output is implemented for the out pin when configured in active low mode. the voltage on the pull - up resistor is limited to the IQS128/IQS128l supply voltage. a 4k7 - 10k resistor between out and v ddhi is recommended. 6.3 rf noise on IQS128/IQS128l 6.3.1 nd: rf noise detection (IQS128) the IQS128 has rf noise detect (nd) functionality. (this option is not available on the IQS128l . ) if nd function is enabl ed, the IQS128 is able to detect rf noise on the ctrl / nd pin. further details on the working of this can be found in the application notes: azd015 and azd015b. 6.3.2 IQS128/IQS128l rf noise immunity the IQS128/IQS128l has advanced immunity to rf noise sources such as gsm cellular telephones, dect, bluetooth and wifi devices. design guidelines should however be followed to ensure the best noise immunity. the design of capacitive sensing applications can encompass a large range of situations but as a summary t he following should be noted to improve a design: a ground plane should be placed under the ic, except under the cx line. all the tracks on the pcb must be kept as short as possible. the capacitor between vddhi and vss as well as between vre g and vss, mus t be placed as close as possible to the ic. a 100 pf capacitor should be placed in parallel with the 1uf capacitor between vddhi and vss. another 100 pf capacitor can be placed in parallel with the 1uf capacitor between vref and vss. if the device is too s ensitive for a specific application a parasitic capacitor (max 5pf) can be added between the cx line and ground. proper sense electrode and button design principles must be followed. unintentional coupling of sense electrode to ground and other circuitry m ust be limited by increasing the distance to these sources. in some instances a ground plane some distance from the device and sense electrode may provide significant shielding from undesired interference. when t he capacitance between the sense electrod e and ground becomes too large the sensitivity of the device may be influenced. 6.4 p thr[1:0] proximity threshold the IQS128/IQS128l has 4 proximity threshold settings indicated in cs . the proximity threshold is selected by the designer to obtain the desired s ensitivity and noise immunity. a proximity event is triggered if the cs diverges more than the selected count from the lta for 6 consecutive cycles . IQS128 configuration: bank0 bit 4 - 3 p th1 :p th0 :proximity thresholds bit selection 00 4 (most sensitive) 01 8 10 12 11 16 (least sensitive) IQS128l configuration: bank0 bit 4 - 3 p thr1 :p thr0 :proximity thresholds bit selection 00 4 (most sensitive) 01 8 10 16 11 32 (least sensitive) free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 16 of 33 all rights reserved november 2012 6.5 t th r [ 2 :0] touch threshold the IQS128/IQS128l has 8 touch threshold settings indicated in cs . the touch threshold is selected by the designer to obtain the desired touch sensitivity. a touch event is triggered if the cs diverges more than the selected count from the lta f or 2 consecutive cycles . in the no - touch state the cs must diverge more than the touch threshold value below the lta. o perating in the touch state, the cs must diverge more than rel_t th r of the touch threshold value above the l ta . the following equation is used to determine if a touch or release event occurred. no touch state: lt a C cs <= t th r touch state: cs - lt a >= rel_ t th r IQS128 configuration: bank0 bit 7 - 5 t th r 2 :t th r 0 touch thresholds bit selection 000 16 (most sensitive) 001 40 010 6 0 011 90 100 130 101 200 110 340 111 500 (least sensitive) iqs1 28l configuration: bank0 bit 7 - 5 t th r 2 :t th r 0 touch thresholds bit selection 000 40 (most sensitive) 001 60 010 100 011 200 100 360 101 500 110 700 111 900 (least sensitive) 6.6 ctrl_direction the ctrl pin can be configured as an input (default) or as an output. if configured as input, the ic has an internal pull - up resistor enabled. see section 6.1 for more information on functionality of ctrl as input. if the ctrl pin is configured as an output it, cannot be used to c ontrol the filter or charge transfer operation. the ctrl pin is activated upon the successful detection of a proximity condition. the pin will remain activated for the duration of the proximity detection as indicated in figure 7.3. if a proximity conditio n is detected in conjunction with a touch event, the pin will only be de - activated when the touch condition is no longer detected as indicated in figure below. free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 17 of 33 all rights reserved november 2012 figure 6.3 proximity and touch output 6.7 t halt[1:0] filter halt the lta fi lter only executes while no proximity events are detected to ensure compensation only for environmental changes. once a touch event is detected the filter will resume operation and will on longer be halted. the halt timing configuration settings determine how long the filter is halted. configuration: bank1 bit 4 - 3 t halt1 :t halt0 lta halt timings for proximity events bit selection 00 always 01 18 seconds 10 60 seconds 11 3 seconds the presence of a proximity condition for a time exceeding the halt time will be deemed as a fault state which would trigger a reseed event where after the output state on the out pin will be reset to its original condition. 6.8 lp [1:0] low power modes ( IQS128l ) there exist 4 lp modes. the lp modes will decrease the sampling frequ ency of cs which will reduce the power consumption of the device. however, t his wil l also increase the response time of the device. configuration: bank1 bit 6 - 5 lp 1 : lp 0 l ow power modes bit selection 00 9.1ms ( boost power mode ) 01 100ms (normal power mode) 10 200ms ( low power mode 1 ) 11 300ms (low power mode 2) p r o x i m i t y a c t u a t i o n 1 0 1 0 p r o x i m i t y a c t u a t i o n t o u c h a c t u a t i o n 1 0 c t r l o u t free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 18 of 33 all rights reserved november 2012 7 streaming mode for a more complete description of the data streaming protocol, please refer to application note azd017 on the azoteq website. t he IQS128/IQS128l has the capability to strea m data to a mcu. this provides the designer the ability to obtain the parameters and sensor data within the device in order to aid design into applications. data streaming is performed as a 1 - wire data protocol on the out pin . t he output function of this pin is therefore lost when the device is configured in streaming mode. data streaming can be enabled as indicated below: configuration: bank1 bit 7 : streaming mode bit selection 0 d isabled 1 e nabled figure 7.1 illustrates the communication protocol for initialising and sending data with the 1 wire communication protocol. 1. communications initiated by a start bit . b it defined as a low condition for t start . 2. following the start bit , is a synchronisation byte (t in it = 0xaa) . this byte is used by the mcu for clock synchronisation. 3. following t init the data bytes will be sent . with short data streaming mode enabled, 5 bytes of data will be sent, otherwise 8 bytes will be sent after each charge cycle. 4. each byte sent will be preceded by a start bit and a stop bit will follow every byte. 5. stop bit indicated by taking pin 1 high. the stop bit does not have a defined period . figure 7.1 debug: 1 - wire streaming debug mode the following table define s t he bit definitions for the IQS128/IQS128l devices during streaming m ode . d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 t o u t / o u t t i n i t t s t o p t d a t a s t o p C s t a r t s t o p C s t a r t s t a r t free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 19 of 33 all rights reserved november 2012 byte definitions for streaming mode byte bit value 0 7:0 cs high byte 1 15:8 cs low byte 2 23:16 lta high byte 3 31:24 lta low byte 4 39 38 37 36 35 34 33 32 ati busy proximity event detected touch event dectected out state indication not u sed zoom active not used not used 5 47 46 45 44 43 42 41 40 ati multiplier (i) ati multiplier (s) ati multiplier (s) compensation (p 4 ) compensation (p3) compensation (p2) compensation (p1) c ompensation (p0) 6 55 :54 53 52 51 50 49 48 not used compensation (p5) touch threshold bit 2 touch threshold bit 1 touch threshold bit 0 proximity threshold bit 1 proximity threshold bit 0 7 63:56 counter azoteq provides a gui (graphical user interface) application that can be utilised to capture and visualise t he data streamed from the IQS128/IQS128l . 8 a utomatic tuning implementation (ati) ati is a sophisticated techn ology implemented in the latest generation proxsense ? devices that optimises the performance of the sensor in a wide range of applications and environmental conditions (refer to application note azd0027 - a utomatic tuning implementation ) . ati makes adjus tments through external reference capacitors unnecessary (as required by most other solutions) to obtain optimum performance . 8.1 ati the IQS128/IQS128l implements an ati algorithm. this algorithm adjusts the ati parameters to optimise the sensing electrode s connection to the device. the device will execute the ati algorithm whenever the device starts - up and or when the cs are not within a predetermined range. there are 2 important definitions to understand for ati: 8.1.1 ati target ati adjusts internal circuitr y according to two parameters, the ati multiplier and the ati compensation . the ati multiplier can be viewed as a course adjustment of cs , used to achieve the ati base value. t he ati compensation is a fine adjustment used to reach the ati target value . with these two parameters the cs of the IQS128/IQS128l is tuned until an ati target value of 1600 is achieved. 8.1.2 ati base : significance of ati base as mentioned above, t he ati m ultiplier is used to select a base value for the ati . the ati base value is impor tant, as this determines the sensitivity of the device. the sensitivity can be defined as: sensitivity = ati target / ati base the ati target remains fixed at 1600 and it can thus be seen from this that a larger base value will result in a less sensitive d evice. the designer has the option to increase/reduce the sensitivity of the system through the ati base value. for most applications the ati base should be kept default. free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 20 of 33 all rights reserved november 2012 the options for the ati base is as follows: IQS128 configuration: bank 2 bit 2 - 1 at i base 1 : a t i base 0 ati base values bit selection 00 200 (most sensitive) 01 100 10 150 11 250 (least sensitive) IQS128l configuration: bank 2 bit 3 - 1 ati base 2 : a t i base 0 ati base values bit selection 000 200 (most sensitive) 001 250 010 300 011 350 100 400 101 550 110 700 111 850 (least sensitive) 8.2 sensitivity due to ati the adjustment of the ati parameters will result in variations in the cs and sensitivity. sensitivity can be observed as the change in cs as the result of a fixed change in sens ed capacitance. the ati parameters have been chosen to provide significant overlap . i t may therefore be possible to select various combinations of ati multiplier and ati compensation settings to obtain the same cs . the sensitivity of the various options may however be different for the same cs . 8.3 ati procedure while the ati algorithm is in progress this condition will be indicated in the streaming data and proximity and touch events cannot be detected. the device will only briefly remain in this conditio n and it will be entered only when relatively large shifts in the cs has been detected. the ati function aims to maintain a constant cs , regardless of the capacitance of the sense electrode (within the maximum range of the device). the effects of ati on the application are the following: automatic adjustment of the device configuration and processing parameters for a wide range of pcb and application designs to maintain a optimal configuration for proximity and touch detection. automatic tuning of the sen se electrode at start - up to optimise the sensitivity of the application. automatic re - tuning when the device detects changes in the sensing electrode s capacitance to accommodate a large range of changes in the environment of the application that influence s the sensing electrode . re - tuning only occurs during device operation when a relatively large sensitivity reduction is detected. this is to ensure smooth operation of the device during operation. re - tuning may temporarily influences the normal functionin g of the device, but in most instances the effect will be hardly noticeable. shortly after the completion of the re - tuning process the sensitivity of a proximity detec tion may be reduced slightly for a few seconds as internal filters stabilises . ati can be implemented so effectively due to: excellent system signal to noise ratio (snr). effective digital signal processing to remove ac and other noise. the very stable core of the devices. the built - in capability to accommodate a large range of sensing electro de capacitances . free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 21 of 33 all rights reserved november 2012 9 dycal specific settings 9.1 rel_t thr : release threshold ( IQS128l ) the IQS128l has the option to increase the release threshold when in tm. this helps that small variations caused by moving a finger/hand on a touch pad will not cause the ic to exit tm, making the solution more robust. the options available are shown below: configuration: bank2 bit4: rel_t thr bit selection 0 75% 1 87.5% 9.2 dycal_output ( IQS128l ) the IQS128l can be configured to activate the out pin with either a proximity ev ent or a touch event. choosing a proximity event, will make the activation of out more sensitive. using a touch event to activate out will make the system less sensitive which is needed in some applications. the lta will still halt with the detection of a proximity but will not have an influence on the out pin. the lta will still re - calibrate once a touch condition is detected. configuration: bank2 bit5:dycal_output bit selection 0 proximity 1 touch free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 22 of 33 all rights reserved november 2012 10 electrical specifications 10.1 absolute maximum specific ations exceeding these maximum specifications may cause damage to the device. operating t emperature - 40c to 85c supply voltage (v ddhi C v ss ) 3 6 . 5 v maximum pin v oltage (out , ctrl ) v ddhi + 0 .5v pin voltage ( c x ) 2.5v minimum pin voltage ( vddhi , vreg , o ut, ctrl , cx ) v ss - 0.5v minimum p ower - o n s lope 1 0 0v/s esd p rotection ( vddhi , vreg , v ss , out , ctrl , cx ) 4 kv 10.2 general characteristics (measured at 25c) standard IQS128/IQS128l devices are rated for supply voltages between 2.95v and 5 .5 v . table 10.1 IQS128/iqs1 28l general operating conditions description conditions parameter min typ max unit supply v oltage v ddhi 2.95 5. 50 v internal regulator o utput 2.95 v ddhi 5. 5 v reg 2.35 2.5 0 2.65 v boost power o perating current 2.95 v ddhi 5. 5 i iqs12 8_bp 7 7 a standby operating current 4 2.95 v ddhi 5. 5 i standby 7 a normal power o perating curr ent 2.95 v ddhi 5. 5 i iqs12 8 _np 31 a low power 1 o perating curr ent 2.95 v ddhi 5. 5 i IQS128l lp 1 17 a low power 2 o perating curr ent 2.95 v ddhi 5. 5 i IQS128l _lp 2 10.5 a table 10.2 start - up and shut - down slope characteristics description ic conditions parameter min max unit por d/s v ddhi slope 100v /s por 1.45 1.70 v bod d/s bod 1.30 1.40 v 3 maximum voltage applied for otp programming and not intended for operation. 4 ctrl = input and ctrl = high (charge halt). free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 23 of 33 all rights reserved november 2012 10.3 output characteristics (measured at 25c) table 10.3 out characteristics symbol description i source (ma) conditions min typ max unit v oh output high voltage 1 v ddhi = 5 .5 v tbd v 1 v ddhi = 3.3v tbd 1 v ddhi = 2. 95 v tbd symbol description i s ink (ma) conditions min typ max unit v o l output low voltage 1 v ddhi = 5 .5 v 0.30 tbd v 1 v ddhi = 3.3v 0.20 tbd 1 v ddhi = 2. 9 5v 0.20 tbd 10.4 timing characteristics table 10.4 main oscillator 5 symbol description conditions mi n typ max unit f osc IQS128/IQS128l main oscillator 2.95 v ddhi 5. 5 0.9 1 1.1 mhz table 10.5 IQS128l response times power mode conditions dycal min ** max unit boost power mode 6 detection 27.3 - ms release 27.3 - ms normal power mode 7 detection 111 - ms release 123 - ms low power mode 1 detection 301 - ms release 313 - ms low power mode 2 detection 821 - ms release 832 - ms * *minimum time calculated as a user touching and exceeding the t thr . touch debounce is 2 and i/o is toggled after next charg e transfer cycle, requiring 3 charge cycles for the minimum time of a decision to be made. 5 all timings are derived from the main oscillator. 6 minimum d etection and release times = 3 x t charge 7 detection min = 3 x t lp_c harge + 2 x t l p (max) (t lp_charge is dependent on counts) (counts is short) release min = 3 x t lp_c harge + 2 x t l p (max) (t lp_charge is dependent on counts) (counts is longer) maximum time = dependent on speed at which user approaches electrode free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 24 of 33 all rights reserved november 2012 table 10.6 general timing characteristics for 2.95v v ddhi 5.5 v table 10.7 IQS128 resp onse times power mode conditions dycal min * max unit boost power mode 8 detection 63.7 - ms release 63.7 - ms * *minimum time calculated as causing a proximity detection on the IQS128. prox debounce is 6 and i/o is toggled after next charge transfer cycle, requiring 7 charge cycles for the minimum time of a decision to be made. 8 IQS128 only available in boost power mode. minimum detection and release times = 7 x t charge symbol description conditions min typ max unit t high output high minimum t ime 9 ms t low output low minimum time 9 ms f cx charge t ransfer frequency 250 khz t charge charge cycle duration c s = 1600, fcx = 250khz 6.4 ms t sample refer to section 4 ms t bp sampling period in bp t charge - 2 sample 9 ms t bp sampling period in bp t charge sample t charge + 2 ms t lp_charge low power charging time cs*(1 /f cx )+t charge t np low power time between charges for lp1. refer to section 4 18.9 27 35.1 ms t lp 1 low power time between charges for lp1. refer to section 4 70 100 130 ms t lp 2 low power t ime between charges for lp1. refer to section 4 210 300 390 ms t start refer to section 0 14.4 17 18.8 us t init refer to section 0 136 us t data refer to section 0 136 us t d ynacal dynamic calibration time 2.95 v ddhi 5.5 ext _ halt halt operation/filter halt time 2.95 v ddhi 5.5 pulse pulse timing 2.95 v ddhi 5.5 free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 25 of 33 all rights reserved november 2012 11 packaging and part - number information 11.1 packaging information 11.1.1 tsot23 - 6 figure 11.1 tsot23 - 6 packaging 9 table 11.1 tsot23 - 6 dimensions dimension min (mm) max (mm) a 2.60 3.00 b 1.50 1.70 c 2.80 3.00 d 0.30 0.50 e 0.95 basic f 0.84 0.90 g 0.00 0.10 h 0.30 0.50 i 0 8 j 0.03 0.20 9 drawing not on scale d a c e f g h i b j free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 26 of 33 all rights reserved november 2012 11.1.2 tsot23 - 6 tape figure 11.2 IQS128tape specification 11.1.3 dfn8 (2x3) c = 0 . 2 5 0 x 4 5 p i n # 1 i d d 1 d 2 n 1 n 8 f e 1 a b e c c 2 c 1 n o t e : b o t h p a c k a g e l e n g t h a n d w i d t h d o n o t i n c l u d e m o l d f l a s h a n d b u r r free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 27 of 33 all rights reserved november 2012 figure 11.3 dfn8 (2x3) packaging 10 table 11.2 dfn8(2x3) dimensions d imension min (mm) max (mm) a 2.0 0.1 b 3.0 0.1 c 0.70 0.80 c1 0~0.050 c2 0.203typ d1 1.60typ d2 1.50typ e 0.250typ e1 0.500typ f 0.400typ 11.1.4 dfn8 tape figure 11.4 dfntape specification 10 drawing not on scale free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 28 of 33 all rights reserved november 2012 11.1.5 m oister s ensitivity level (msl) moisture sensitivity level relates to the packaging and handling precautions for some semiconductors. the msl is an electronic standard for the time period in which a moisture sensitive device can be exposed to ambient room conditions (approximately 30c/60%rh). increasingly, semiconductors have been manufactured in smaller sizes. components such as thin fine - pitch devices and ball grid arrays could be damaged during smt reflow when moisture trapped inside the comp onent expands. the expansion of trapped moisture can result in internal separation ( delamination ) of the plastic from the die or lead - frame, wire bond damage, die damage, and inter nal cracks. most of this damage is not visible on the component surface. in extreme cases, cracks will extend to the component surface. in the most severe cases, th e component will bulge and pop. table 11.3 IQS128 packaging msl information package level (duration) tsot23 - 6 msl1 (unlimited at 30 c/85% rh ) dfn8 (2x3) msl 3 C 168 hours free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 29 of 33 all rights reserved november 2012 11.2 device packaging convention 11.2.1 IQS128 11.2.1.1 top 11.2.1.2 bottom 11.2.2 IQS128l 11.2.2.1 top 128xx zzzzz iqs 12 8 l 1 i z z z zzz xx batch configuration ic name ic name configuration batch free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 30 of 33 all rights reserved november 2012 11.3 ordering information only full reels can be ordered and o rders will be subject to a moq (minimum order quantity) of a full reel. contact t he official distributor for sample quantities. a list of the distributors can be found under the distributors section of www.azoteq.com . for large orders, azoteq can provide pre - configured devices. the part - number can be generated by using usbprog.exe or the interactive part number generator on the website. 11.3.1 IQS128 ic name IQS128 = iqs12 8 configuration zzzzz = ic configuration (hexadecimal) package type ts = t so t23 - 6 bulk packaging r = reel (3000pcs/reel ) moq = 1 reel. mass production orders shipped as full reels. 11.3.2 IQS128l ic name IQS128l = IQS128l configuration zzzzzz = ic configuration (hexadecimal) package type dn = dfn8 (2x3) bulk packaging r = reel (3000pcs/reel) moq = 1 reel. mass production orders shipped as full reels. IQS128 zzzzz ppb IQS128 l zzzzz z ppb configuration configuration ic name ic name bulk packaging bulk packaging package type package type free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 31 of 33 all rights reserved november 2012 12 errata - section 11.2.2 : it must be noted that the previous packaging for the IQS128l is still being phased out and for this reason ics can still be found with th e below packaging convention and device markings . packaging convention: device markings: 12 8lxx z z z z z 128 lxx ic name z z z z z configuration 1 batch 2 3 4 5 6 7 8 vddhi v reg ctrl nc cx vss out nc free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 32 of 33 all rights reserved november 2012 13 datasheet revision history version 1. 1 0 - preliminary release version 2.0 - added IQS128l and its functional differences - added ati base description - a dded nd feature description for IQS128 version 2.1 - updated aesthetics version 2.2 - changed qfn to dfn - changed power mode names version 2.3 - updated maximum operating voltage to 5.5 throughout document - updated absolute maximum specification: su pply voltage to 6.5v. (only intended for otp programming!) version 2.4 - updated por and bor table - updated packaging and part - number information - changed current sample references to counts (cs) - changed a ntenna references to electrode - changed au to - ati references to ati - changed device markings - added tape/reel specification - moved section on packaging information to section 12 - made revision history a section on its own - added tape specification - added errata to accommodate previous packaging free datasheet http:///
i q switch ? proxsense ? series copyright ? azoteq (pty) ltd 20 12 IQS128 & IQS128l datasheet v 2.4 page 33 of 33 all rights reserved november 2012 14 contact information development centre & head quaters physical address 109 main street paarl 7646 western cape republic of south africa tel: +27 (0) 21 863 0033 fax: +27 (0) 21 863 1512 postal address po box 3534 paarl 7620 republic of south africa sales, finance, admin office physical address menlyn square, east block, first floor, 116 lois, c/o gobie avenue , menlyn pretoria 0181 gauteng republic of south africa tel: +27 (0) 12 361 9338 fax : +27 (0) 12 361 3784 postal address po bo x 491 menlyn 0063 republic of south africa the following patents relate to the device or usage of the device: us 6,249,089 b1, us 6,621,225 b2, us 6,650,066 b2, us 6,952,084 b2, us 6,984,900 b1, us 7,084,526 b2, us 7,084,531 b2, us 7,119,459 b2, us 7,265 ,494 b2, us 7,291,940 b2, us 7,329,970 b2, us 7,336,037 b2, us 7,443,101 b2, us 7,466,040 b2, us 7,498,749 b2, us 7,528,508 b2, us 7,755,219 b2, us 7,772,781, us 7,781,980 b2, us 7,915,765 b2, ep 1 120 018 b1, ep 1 206 168 b1, ep 1 308 913 b1, ep 1 530 178 b1, zl 99 8 14357.x, aus 761094 iq switch?, proxsense?, lightsense?, airbutton? and the logo are trademarks of azoteq. the information in this datasheet is believed to be accurate at the time of publication. azoteq assumes no liability arising from th e use of the information or the product. the applications mentioned herein are used solely for the purpose of illustration and azoteq makes no warranty or representation that such applications will be suitable without further modification, nor recommends t he use of its products for application that may present a risk to human life due to malfunction or otherwise. azoteq products are not authorized for use as critical components in life support devices or systems. no licenses to patents are granted, implicitly or otherwise, under any intellectual property rights. azoteq reserves the right to alter its products without prior notification. for the most up - to - date information, please refer to www. azoteq.com . www.azoteq.com proxsensesupport@azoteq.com free datasheet http:///

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