N55T10 data sheet release date: sep. 27, 20 13 - 1 - ver ision : a6.0 1. general description the n55t 10 is a general purpose capacitive touch sensor to co - work with other general micro - processors through serial interface. one N55T10 can support up to 10 sensor pads . each pad equip s with environment adaptive calibration function to prevent false trigger . the n55t 10 features serial interface to communicate with master microprocessor to receive command /configuration from master and deliver touch sensor pad status to master chip. the n55t 10 provides s tand - by mode to minimize the po wer consumption and all touch sensor pads can be waked up under low stand - by current . part number sensor pad s wake up serial interface auto calibration N55T10 10 v v v
N55T10 data sheet release date: sep. 27, 20 13 - 2 - ver ision : a6.0 2. feature s ? w ide range of operating voltage: ? 2. 1 ~ 5.5v ? built - in oscillator ? built - in r egulator ? operating modes: normal mode and stand - by mode ? max 10 touch sensor pads ? a ny sensor pad can be configured to wake up ? configurable less number of sensor pads to speed up response time ? key lock release feature ? r eset management ? p ower - on reset ? reset c o mmand from master chip ? 1 s tandby current : 10 ua @3v , 10 sensor pad s ? operating current : 50 0ua @3v , 10 sensor pad s ? the sensor function still can work while one speaker connecting to the same power supply is playing. ? support d evelopment system ? c onfiguration em ulator with usb port ? configuration tool for developing parameters easily 1 the standby current depend s on the number of active sensor pad s.
N55T10 data sheet release date: sep. 27, 20 13 - 3 - ver ision : a6.0 3. block diagram figure 1 N55T10 block diagram 3.1 p in description pin name type function r osc i ring oscillator resistor pin v dd power power vss ground ground reg out o regulator output ip0~ip9 i cap s ensor input pins . sc lk i s erial clock sd i /o s erial data / sint o serial interrupt to master mcu /r st i reset pin cscfg i chip select configuration pin analogic engine serial interface control logical sclk sd cscfg timing generator configuration and algorithm logic /sint 10 ip0-ip9 regulator regout rosc oscillator /rst
N55T10 data sheet release date: sep. 27, 20 13 - 4 - ver ision : a6.0 4. functional descri ption the n55t 10 provides up to 10 touch sensor pads . each touch sensor pad can be configured to be able to wake up or not . there are normal mode and s tand - by mode for the chip. in the s tand - by mode , chip consume s less current to save power and any sensor pad can be wake d up. this chip equip s calibration function to adapt to new circumstances to prevent false trigger . 4.1 serial interface there are three pins for the serial interface. this chip always act s as a slave chip. there are sclk, sd and /sint pins. a nother mcu will be needed and act as master chip. master mcu control/configure and get s sensor pad status through the serial interface. 1. sclk always generate from master mcu. 2. sd can be command or parameters from master mcu or sensor pad status from this c hip. 3. /sint pin act as interrupt pin and will be active wheneve r any of monitored sensor pads status was changed. and /sint will release once the sensor pads status was read by mcu from serial port.
N55T10 data sheet release date: sep. 27, 20 13 - 5 - ver ision : a6.0 5. electrical character istics 5.1 absolute maximum ratings para meter symbol conditions rated value unit power supply v dd ? v ss - - 0.3 to +7.0 v input voltage v in all inputs v ss - 0.3 to v dd +0.3 v operating temp. t opr - 0 to + 7 0 ? c note: exposure to conditions beyond those listed under the absolute maximum ratings ta ble may adversely affect the life and reliability of the device. 5.2 dc c haracteristics (v dd ? v ss = 3.0 v, t a = 25 ? parameter sym. conditions min. typ. max. unit operating v oltage v dd 2. 1 - 5.5 v input l ow v oltage v il all input pins v ss - 0.3 v dd v input h igh v oltage v ih all input pins 0.7 v dd - v dd v operating current i op 10 sensor pads - 500 - ua standby current i sb 1 sensor pad - 3 - ua 5 sensor pads - 6 - ua 10 sensor pads - 10 - ua 1 sensor pad (v dd =4.5v) - 5 - ua 5 sensor pads (v dd =4.5v) - 10 - ua 10 sensor pads (v dd = 4.5v) - 15 - ua power down current i pd - - 1 ua pull - high resistor r ph 50 100 200 k ?
N55T10 data sheet release date: sep. 27, 20 13 - 6 - ver ision : a6.0 5.3 ac c haracteristics (v dd C v ss = 3.0v, t a = 25 ? c ; u nless otherwise specified) parameter sym. conditions min. typ. max. unit external main oscillator frequency f ext r osc =220kohm 10 - mhz frequency deviation by voltage drop external main oscillator (r osc =220k , v reg =2.0v~2.4v ) 10 % sensor pad response time ( 10 active pads ) t rt standby mode - 310 - ms sensor pad response time (10 active pads ) t rt normal mode - 100 - ms sclk f sclk - - 4 mhz sync clk tsync 1 - - sclk
N55T10 data sheet release date: sep. 27, 20 13 - 7 - ver ision : a6.0 6. typical ap plication circuit figure 2 application circuit of n55t 10 c3 4.7uf u1 N55T10 die sd 2 cscf g 4 ip9 6 ip7 8 ip5 10 ip3 12 ip1 14 vss 17 vdd 19 nc 22 /sint 1 sclk 3 nc 5 ip8 7 ip6 9 ip4 11 ip2 13 ip0 15 /rst 16 regout 18 rosc 20 nc 21 nc 23 c4 0.1uf vdd c1 4.7uf gnd j1 conn 6 1 1 2 2 3 3 4 4 5 5 6 6 sint sclk vdd gnd sda vdd bp00 connect to configuration usb bridge. open when N55T10 connects to configuration usb bridge. mcu bp02 bp01 vss note 1 note 2: this application circuit illustrates the usage of built-in oscillator, hence the rosc pin does not need to connect external resistor. note 2 note 1: in this application circuit, this ip0 is used to sense environment temperature drop quickly. the control flow of mcu should reset N55T10 once ip0 is active. this methodology can avoid the false trigger due to environment temperature variation quickly. but if the product is not concerned about the environment temperature drop quickly, the ip0 can be used as a sensor pad. sensor pad5 sensor pad2 sensor pad9 sensor pad7 sensor pad8 c5 30pf sensor pad1 sensor pad4 sensor pad3 sensor pad6 c2 0.1uf
N55T10 data sheet release date: sep. 27, 20 13 - 8 - ver ision : a6.0 7. revision history revision date modifications a 1.0 october 200 9 ? preliminary release. a 2.0 december 2009 ? add touch modes description a 3.0 january 2010 ? modify the spec for 3 batteries applica tion a 4.0 february 2010 ? add some features a5.0 march 2010 ? confidential release a5 .1 may 2010 ? add the serial interface ac spec a5 .2 may,28 2010 ? modify the block diagram ? modify the standby current data with different conditions ? typ application ci rcuit modify for regout and cscfg pin a5 . 3 aug , 12 2010 ? remove some useless data ? modify the standby current data in typical conditions ? update the t yp ical application circuit for usb bridge a6.0 sep, 2 7, 2013 ? update the typical application circuit. ? to uniform the terminology to use sensor pads instead of key.
N55T10 data sheet release date: sep. 27, 20 13 - 9 - ver ision : a6.0 important notice nuvoton products are neither intended nor warranted for usage in systems or equipment, any malfunction or failure of which may cause loss of human life, bodi ly injury or severe property damage. such applications are deemed, insecure usage. insecure usage includes, but is not limited to: equipment for surgical implementation, atomic energy control instruments, airplane or spaceship instruments, the control o r operation of dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all types of safety devices, and other applications intended to support or sustain life. all insecure usage shall be made at customers risk, and in t he event that third parties lay claims to nuvoton as a result of customers insecure usage, customer shall indemnify the damages and liabilities thus incurred by nuvoton.
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