? semiconductor components industries, llc, 2010 november, 2010 ? rev. 3 1 publication order number: cat5126/d cat5126 one-time digitally programmable 32-tap potentiometer description the cat5126 is a digital programmable potentiometer. the wiper position is controlled with a simple 2 ? wire digital interface. this digital potentiometer is unique in that it has an optional one ? time programmable feature that either sets the wiper?s position upon power ? on to a user ? defined value, or the wiper can be set and the interface also disabled to prevent further adjustment. the cat5126 has an end ? to ? end resistance of 10 k , 50 k , and 100 k . all cat5126 devices have 32 ? wiper positions and operate from a single 2.5 v to 5.5 v supply. the cat5126 is available in tdfn 8 ? pad and msop 8 ? lead packages. each device is guaranteed over the industrial temperature range of ? 40 c to +85 c. features ? wiper position stored after one ? time non ? volatile programming ? user ? defined power ? on wiper position ? 32 ? tap positions ? wiper position programmed through simple 2 ? wire serial interface ? low 0.35 a (typ) static supply current ? 2.5 v to 5.5 v single ? supply operation ? 10 k , 50 k , and 100 k end ? to ? end resistances ? 50 ppm/ c end ? to ? end t emperature coefficient and 5 ppm/ c ratiometric temperature coefficient ? tdfn 8 ? pad (2 x 3 mm) and msop 8 ? lead packages ? these devices are pb ? free, halogen free/bfr free and are rohs compliant applications ? mechanical potentiometer replacement ? products using one ? time factory calibration ? contrast, brightness, volume controls ? programmable analog functions http://onsemi.com pin configurations see detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. ordering information msop ? 8 z suffix case 846ad msop (z) (top views) gnd v dd cs r w v pp r l r h u/d 1 tdfn ? 8 vp2 suffix case 511ak tdfn (vp2) gnd v dd cs r w v pp r l r h u/d 1
cat5126 http://onsemi.com 2 figure 1. functional diagram 32 ? position decoder 8 1 7 5 6 2 4 3 up/down counter one ? time program block gnd v pp v dd u/d cs r l r 1 r 2 r 31 r 30 r w r w r h table 1. pin description pin name function 1 r w wiper connection 2 cs chip ? select input. a high ? to ? low cs transition determines the mode: increment if u/d is high, or decrement if u/d is low. cs is also used for one ? time programming (see the one ? time programming section). 3 v dd power ? supply voltage 4 gnd ground 5 v pp programming voltage for one ? time programming. connect v pp to 10 v supply when one ? time programming the device. for normal operation, connect to ground or let float. 6 u/d up/down control input. with cs low, a low ? to ? high transition increments or decrements the wiper position. 7 r l low terminal of resistor 8 r h high terminal of resistor table 2. absolute maximum ratings parameters ratings units v dd to gnd ? 0.5 to +7.0 v v pp to gnd ? 0.5 to +12.0 v all other pins to gnd ? 0.5 to v dd +0.5 v maximum continuous current into h, l, and w 1.5 ma continuous power dissipation (t a = +70 c) msop 8 ? lead (derate 4.5 mw/ c above +70 c) tdfn 8 ? pad (derate 24.4 mw/ c above +70 c) 362 1951 mw operating temperature range ? 40 to +85 c junction temperature +150 c storage temperature range ? 65 to +150 c lead temperature (soldering, 10 s) +300 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability.
cat5126 http://onsemi.com 3 table 3. electrical characteristics (v dd = 2.5 v to 5.5 v, v pp = gnd, r h = v dd , r l = gnd, t a = ? 40 c to +85 c, unless otherwise noted. typical values are at v dd = 5.0 v, t a = +25 c, unless otherwise noted.) (note 1) symbol parameter conditions min typ max units dc performance res resolution 3.2 % r pot end ? to ? end resistance ? 10 device 8 10 12 k ? 50 device 40 50 60 ? 00 device 80 100 120 tc rpot tc of pot resistance 50 300 ppm/ c tc ratio ratiometric resistance tc 5 20 ppm/ c inl integral nonlinearity potentiometer configuration, no load 0.5 1 lsb dnl differential nonlinearity potentiometer configuration, no load 0.25 0.5 lsb r w wiper resistance v dd = 5 v 70 100 v dd = 2.5 v 150 200 digital inputs (cs , u/d ) v ih input high voltage 0.7 x v dd v v il input low voltage 0.3 x v dd v i in input leakage current 0.1 1 a c in input capacitance 5 pf power supply v dd supply voltage 2.5 5.5 v i dd stand by current (note 2) 0.35 1 a i ddw programming current 0.25 1 ma v pp programming voltage v dd = 5 v 8.5 10 v v dd = 2.5 v 6.0 10 i pp v pp input current v pp = 10 v 5 a timing characteristics (note 3) t cu u/d mode to cs setup figures 6, 7 50 ns t ci cs hold to u/d mode figures 6, 7 50 ns t ic u/d step hold to cs figures 6, 7 0 ns t il u/d step low time figures 6, 7 100 ns t ih u/d step high time figures 6, 7 100 ns t iw wiper switching time c l = 0 pf, figures 6, 7 100 ns t pc v pp rising edge to cs falling edge figure 8 1 ms t cp cs falling edge to v pp falling edge figure 8 5 ms t cl cs step low time figure 8 5 ms t ch cs step high time figure 8 5 ms t ph v pp falling edge to cs rising edge figure 8 1 ms f u/d max u/d frequency 5 mhz 1. all devices are production tested at t a = +25 c and are guaranteed by design for t a = ? 40 c to +85 c. 2. digital inputs cs and u/d are connected to gnd or v dd . 3. digital timing is guaranteed by design, not production tested. 4. power ? up time is the period of time from when the power supply is applied until the serial interface is ready for writing.
cat5126 http://onsemi.com 4 table 3. electrical characteristics (v dd = 2.5 v to 5.5 v, v pp = gnd, r h = v dd , r l = gnd, t a = ? 40 c to +85 c, unless otherwise noted. typical values are at v dd = 5.0 v, t a = +25 c, unless otherwise noted.) (note 1) (continued) symbol units max typ min conditions parameter timing characteristics (note 3) t up power ? up time (note 4) 1 ms t settle output settling time 100 k variable resistor configuration, c l = 10 pf 1 s 100 k potentiometer configuration, c l = 10 pf 0.25 1. all devices are production tested at t a = +25 c and are guaranteed by design for t a = ? 40 c to +85 c. 2. digital inputs cs and u/d are connected to gnd or v dd . 3. digital timing is guaranteed by design, not production tested. 4. power ? up time is the period of time from when the power supply is applied until the serial interface is ready for writing. typical operating characteristics (v dd = 2.5 v to 5.5 v, v pp = gnd, v h = v dd , v l = gnd, t a = +25 c) figure 2. v pp vs. v dd figure 3. i dd programming vs. v dd v dd (v) v dd (v) 5.5 4.5 3.5 2.5 5 6 7 8 9 10 5.5 4.5 3.5 2.5 100 150 200 250 300 figure 4. wiper resistance vs. tap position @ 25 c figure 5. wiper voltage vs. tap position tap position tap 30 20 10 0 0 20 40 60 80 100 120 30 20 10 0 0 1 2 3 4 5 6 v pp (v) i cc ( a) r w ( ) v w (v) valid programming invalid programming v dd = 2.5 v v dd = 5.0 v v dd = 5.0 v v dd = 2.5 v
cat5126 http://onsemi.com 5 detailed description the cat5126 devices are 10 k /50 k /100 k (end ? to ? end resistance) digitally controlled potentiometers. they have 32 ? tap positions that are accessible to the wiper along the resistor array between r h and r l . the wiper (r w ) position is adjusted sequentially through the tap positions using a simple i 2 c interface. these digital potentiometers have an optional one ? time programmable feature that sets the por position of the wiper. the i 2 c interface can then be disabled, permanently preventing unwanted adjustment. digital interface operation the cat5126 devices have two modes of operation when the serial interface is active: increment mode and decrement mode. the serial interface is only active when cs is low. the cs and u/d inputs control the position of the wiper along the resistor array. when cs transitions from high to low, the part goes into increment mode if u/d is high (figure 6), and into decrement mode if u/d is low (figure 7). once the mode is set, the device remains in that mode until cs goes high. a low ? to ? high transition at the u/d increments or decrements the wiper position depending on the current mode. the value of the counter is then stored and the wiper position is maintained till the device is powered down. the wiper performs a make ? before ? break transition, ensuring that there is never an open circuit during a transition from one resistor tap to another. when the wiper is at either end (max/min) of the resistor array, additional transitions in the direction of the endpoint do not change the counter value (the counter does not wrap around). one ? time programming the factory ? set default position of the wiper on power ? up is tap 16. however, the power ? up position can be changed once using the one ? time programming feature. after the wiper is moved to the desired position, the programming sequence is initiated by setting u/d high, applying 10 v to v pp , and then taking cs low. five pulses on cs (consisting of cs starting from low and going high for t ch and then low for t cl ) program the device (figure 8). the programming voltage should then be taken to zero. after the device is programmed, v pp can be set to zero or be allowed to float. the wiper position is still adjustable, but always returns to this programmed position on power ? up. figure 6. increment mode serial interface timing diagram t ci t cu t up t ic t ih t iw t il v dd cs u/d v w figure 7. decrement mode serial interface timing diagram t ic t il t ih t iw t ci t cu t up v w u/d cs v dd
cat5126 http://onsemi.com 6 if the intent is to program the device to a specific wiper position and not to allow further adjustments, then six programming pulses are required (as opposed to five), as shown in figure 8. the sixth pulse locks the wiper position and disables the serial interface. this also allows u/d and cs to float without any increase in supply current. once the lockout bit is set, no further adjustment to the potentiometer is possible, effectively changing the potentiometer into a fixed resistor ? divider (table 4). it is recommended that the user either use six cs pulses (convert to a fixed voltage ? divider) or five pulses (program the initial power ? up value of the device, but still be able to adjust the wiper). if the device is programmed with five pulses and later it is desired to disable the interface (convert to a fixed voltage ? divider), then care must be taken to ensure that the wi per is in the same position as it was originally set to (when programmed with five pulses). the full six programming pulses must be applied. note that once the six ? pulse program occurs, no further programming is possible. table 4. one ? time programming mode mode power up position interface operation factory default at midscale active programming allowed programming with 5 pulses at the midscale position at midscale active programming allowed programming with 5 pulses different from midscale position ? only once at the new programmed position active no further change in power ? up position allowed programming with 5 pulses if the power up position was changed before at the previous programmed position active none programming with 6 pulses if the tap position is at midscale midscale position forever i 2 c interface active till power down i 2 c interface disable after next power ? up programming only with 6 pulses if the tap position is different from midscale position at the new programmed position i 2 c interface active till power down i 2 c interface disable after next power ? up figure 8. one time program mode serial interface timing diagram 10 v 0 v 5 bits program wiper position optional lockout bit t ch t cl t pc t ph t cp v pp cs u/d 5. if cat5126 is programmed with less than 5 pulses, it does not change the power ? up recall position. 6. during internal power ? up the wiper is forced to miscale; thereafter the wiper is set at the stored position.
cat5126 http://onsemi.com 7 package dimensions msop 8, 3x3 case 846ad ? 01 issue o e1 e a2 a1 e b d c a top view side view end view l1 l2 l detail a detail a notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-187. symbol min nom max a a1 a2 b c d e e1 e l 0o 6o l2 0.05 0.75 0.22 0.13 0.40 2.90 4.80 2.90 0.65 bsc 0.25 bsc 1.10 0.15 0.95 0.38 0.23 0.80 3.10 5.00 3.10 0.60 3.00 4.90 3.00 l1 0.95 ref 0.10 0.85
cat5126 http://onsemi.com 8 package dimensions tdfn8, 2x3 case 511ak ? 01 issue a pin#1 identification e2 e a3 eb d a2 top view side view bottom view pin#1 index area front view a1 a l d2 notes: (1) all dimensions are in millimeters. (2) complies with jedec mo-229. symbol min nom max a 0.70 0.75 0.80 a1 0.00 0.02 0.05 a3 0.20 ref b 0.20 0.25 0.30 d 1.90 2.00 2.10 d2 1.30 1.40 1.50 e 3.00 e2 1.20 1.30 1.40 e 2.90 0.50 typ 3.10 l 0.20 0.30 0.40 a2 0.45 0.55 0.65
cat5126 http://onsemi.com 9 example of ordering information (note 10) prefix device # suffix company id cat 5126 z product number 5126 i ? gt3 package i = industrial ( ? 40 c to +85 c) temperature range z: msop vp2: tdfn g: nipdau t: tape & reel 3: 3,000 units / reel tape & reel (note 12) (optional) ? 10 resistance ? 10: 10 k ? 50: 50 k ? 00: 100 k lead finish table 5. ordering information orderable part numbers resistor (k ) package ? pin parts per reel cat5126vp2i10gt3 (note 7) 10 tdfn 3000 cat5126vp2i50gt3 (notes 7, 11) 50 tdfn 3000 cat5126vp2i00gt3 (notes 7, 11) 100 tdfn 3000 cat5126zi ? 10 ? gt3 10 msop 3000 cat5126zi ? 50 ? gt3 (note 11) 50 msop 3000 cat5126zi ? 00 ? gt3 (note 11) 100 msop 3000 7. part number is not exactly the same as the ?example of ordering information? shown above. for the indicated part numbers the re are no hyphens in the orderable part numbers. 8. all packages are rohs ? compliant (lead ? free, halogen ? free). 9. the standard lead finish is nipdau. 10. the device used in the above example is a ca t5126zi ? 10 ? gt3 (msop, industrial temperature, 10 k , nipdau, tape & reel, 3,000/reel). 11. for additional package and temperature options, please contact your nearest on semiconductor sales office. 12. for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and ree l packaging specifications brochure, brd8011/d. on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. cat5126/d publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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