CAT5126 One-Time Digitally Programmable 32-Tap Potentiometer FEATURES DESCRIPTION Wiper position stored after one-time nonvolatile programming 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 onetime 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. User-defined Power-On wiper position 32-tap positions Wiper position programmed through simple 2-wire serial interface Low 0.35 µA (typ) static supply current 2.5 V to 5.5 V single-supply operation The CAT5126 has an end-to-end resistance of 10 kΩ, 50 kΩ, and 100 kΩ. All CAT5126 devices have 32-wiper positions and operate from a single 2.5 V to 5.5 V supply. 10 kΩ, 50 kΩ, and 100 kΩ end-to-end resistances 50 ppm/°C end-to-end temperature coefficient and 5 ppm/°C ratiometric temperature coefficient 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. TDFN 8-pad (2 x 3 mm) and MSOP 8-lead packages APPLICATIONS Mechanical potentiometer replacement For Ordering Information details, see page 10. Products using one-time factory calibration Contrast, brightness, volume controls Programmable analog functions FUNCTIONAL DIAGRAM PIN CONFIGURATION RH 8 MSOP (Z) (top view) 1 VDD 3 8 RH ¯¯¯ CS 2 CAT 7 RL VDD 3 5126 6 ¯ U/D 4 VPP RW GND 5 GND CS U/D 1 2 3 4 8 7 6 5 2 R30 UP/DOWN COUNTER 6 RW 32-POSITION DECODER TDFN (VP2) (top view) RW ¯¯¯ CS VDD GND R31 4 VPP RH RL ¯ U/D VPP 5 ONE-TIME PROGRAM BLOCK R2 R1 7 RL © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 1 Doc. No. MD-2129 Rev. D 1 RW CAT5126 PIN DESCRIPTION Pin Name Function 1 RW Wiper Connection 2 ¯¯¯ CS ¯¯¯ transition determines the mode: increment if U/D ¯ is high, or Chip-Select Input. A high-to-low CS ¯ is low. CS ¯¯¯ is also used for one-time programming (see the One-Time decrement if U/D Programming section). 3 VDD Power-Supply Voltage 4 GND 5 VPP Programming Voltage for One-Time Programming. Connect VPP to 10 V supply when one-time programming the device. For normal operation, connect to ground or let float. 6 ¯ U/D ¯¯¯ low, a low-to-high transition increments or decrements the Up/Down Control Input. With CS wiper position. 7 RL Low Terminal of Resistor 8 RH High Terminal of Resistor Ground ABSOLUTE MAXIMUM RATINGS (1) Parameters VDD to GND VPP to GND All other pins to GND Maximum Continuous Current into H, L, and W Continuous Power Dissipation (TA = +70°C) MSOP 8-Lead (derate 4.5mW/°C above +70°C) TDFN 8-Pad (derate 24.4mW/°C above +70°C) Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10 s) Ratings -0.5 to +7.0 -0.5 to +12.0 -0.5 to VDD +0.5 ±1.5 Units V V V mA 362 1951 mW mW -40 to +85 +150 -65 to +150 +300 ºC ºC ºC ºC Notes: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. Doc. No. MD-2129 Rev. D 2 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 ELECTRICAL CHARACTERISTICS VDD = 2.5 V to 5.5 V, VPP = GND, RH = VDD, RL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical (1) values are at VDD = 5.0 V, TA = +25°C, unless otherwise noted. Symbol Parameter Conditions Min Typ Max Units DC PERFORMANCE RES RPOT TCRPOT TCRATIO Resolution End-to-End Resistance 3.2 % -10 Device 8 10 12 -50 Device 40 50 60 -00 Device 80 100 120 ±50 ±300 ppm/°C ±5 ±20 ppm/°C TC of Pot Resistance Ratiometric Resistance TC kΩ INL Integral Nonlinearity Potentiometer configuration, no load 0.5 1 LSB DNL Differential Nonlinearity Potentiometer configuration, no load 0.25 0.5 LSB VDD = 5 V 70 100 Ω VDD = 2.5 V 150 200 Ω RW Wiper Resistance ¯¯¯, U/D ¯) DIGITAL INPUTS (CS VIH Input High Voltage VIL Input Low Voltage IIN Input Leakage Current CIN Input Capacitance 0.7 x VDD V ±0.1 0.3 x VDD V ±1 µA 5 pF POWER SUPPLY VDD Supply Voltage IDD Stand by Current IDDW Programming Current VPP Programming Voltage IPP VPP Input Current 2.5 5.5 V 0.35 1 µA 0.25 1 mA VDD = 5 V 8.5 10 VDD = 2.5 V 6.0 10 (Note 2) VPP = 10 V 5 V µA Notes: (1) All devices are production tested at TA = +25°C and are guaranteed by design for TA = -40°C to +85°C. ¯¯¯ and U/D ¯ are connected to GND or VDD. (2) Digital inputs CS © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 3 Doc. No. MD-2129 Rev. D CAT5126 ELECTRICAL CHARACTERISTICS (continued) VDD = 2.5 V to 5.5 V, VPP = GND, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 5.0 V, TA = +25°C, unless otherwise noted. (1) TIMING CHARACTERISTICS (2) Symbol Parameter Conditions Min tCU ¯ Mode to CS ¯¯¯ Setup U/D Figures 1, 2 50 ns tCI ¯¯¯ Hold to U/D ¯ Mode CS Figures 1, 2 50 ns tIC ¯ Step Hold to CS ¯¯¯ U/D Figures 1, 2 0 ns tIL ¯ Step Low Time U/D Figures 1, 2 100 ns tIH ¯ Step High Time U/D Figures 1, 2 100 ns tIW Wiper Switching Time CL = 0 pF, Figures 1, 2 tPC tCP ¯¯¯ VPP Rising Edge to CS Falling Edge ¯¯¯ Falling Edge to VPP CS Falling Edge Typ Max 100 Units ns Figure 3 1 ms Figure 3 5 ms tCL ¯¯¯ Step Low Time CS Figure 3 5 ms tCH ¯¯¯ Step High Time CS Figure 3 5 ms tPH ¯¯¯ VPP Falling Edge to CS Rising Edge Figure 3 1 ms fU/D¯MAX ¯ Frequency U/D tUP Power-Up Time tSETTLE Output Settling Time (Note 3) 100 kΩ variable resistor configuration, CL = 10 pF 1 100 kΩ potentiometer configuration, CL = 10 pF 0.25 5 MHz 1 ms µs Notes: (1) All devices are production tested at TA = +25°C and are guaranteed by design for TA = -40°C to +85°C. (2) Digital timing is guaranteed by design, not production tested. (3) Power-up time is the period of time from when the power supply is applied until the serial interface is ready for writing. Doc. No. MD-2129 Rev. D 4 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 TYPICAL OPERATING CHARACTERISTICS VDD = 2.5 V to 5.5 V, VPP = GND, VH = VDD, VL = GND, TA = +25°C. VPP vs. VDD IDD programming vs. VDD 10 300 Valid Programming 250 8 7 ICC (uA) VPP (V) 9 Invalid Programming 200 150 6 5 100 2.5 3.5 4.5 5.5 2.5 3.5 VDD (V) 5.5 VDD (V) Wiper Resistance vs. Tap Position @ 25°C Wiper Voltage vs. Tap Position 120 6.0 VDD = 2.5V 100 5.0 80 VDD = 5.0V 4.0 V W (V) R W (Ω ) 4.5 60 40 3.0 2.0 VDD = 5V 20 VDD = 2.5V 1.0 0 0.0 0 10 20 30 0 Tap Position © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 10 20 30 Tap 5 Doc. No. MD-2129 Rev. D CAT5126 decrements the wiper position depending on the current mode. DETAILED DESCRIPTION The value of the counter is then stored and the wiper position is maintained till the device is Powered down. The CAT5126 devices are 10 kΩ/50 kΩ/100 kΩ (endto-end resistance) digitally controlled potentiometers. They have 32-tap positions that are accessible to the wiper along the resistor array between RH and RL. 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). The wiper (RW) position is adjusted sequentially through the tap positions using a simple I2C interface. These digital potentiometers have an optional one-time programmable feature that sets the POR position of the wiper. The I2C interface can then be disabled, permanently preventing unwanted adjustment. One-Time Programming The factory-set default position of the wiper on powerup 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 ¯ high, programming sequence is initiated by setting U/D CS low. Five applying 10 V to VPP, and then taking ¯¯¯ pulses on ¯¯¯ CS (consisting of ¯¯¯ CS starting from low and going high for tCH and then low for tCL) program the device (Figure 3). The programming voltage should then be taken to zero. After the device is programmed, VPP 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. 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 ¯¯¯ is low. active when CS ¯¯¯ and U/D ¯ inputs control the position of the The CS ¯¯¯ transitions wiper along the resistor array. When CS from high to low, the part goes into increment mode if ¯ is high (Figure 1), and into decrement mode if U/D ¯ is low (Figure 2). Once the mode is set, the U/D ¯¯¯ goes high. A device remains in that mode until CS ¯ increments or low-to-high transition at the U/D VDD tUP CS tCU tCI tIL tIH tIC U/D tIW VW Figure 1. Increment Mode Serial Interface Timing Diagram VDD CS U/D tUP tCU tCI tIH tIL tIC tIW VW Figure 2. Decrement Mode Serial Interface Timing Diagram Doc. No. MD-2129 Rev. D 6 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 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 3. The sixth pulse locks the wiper position and disables the serial ¯ and CS ¯¯¯ to float without interface. This also allows U/D 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 1). 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 wiper 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. ¯¯¯ It is recommended that the user either use six CS pulses (convert to a fixed voltage-divider) or five Table 1. 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 powerup 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 I2C interface active till power down I2C 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 I2C interface active till power down I2C interface disable after next power-up U/D 10V VPP 0V tCH tCL tCP CS tPH tPC 5 BITS PROGRAM WIPER POSITION OPTIONAL LOCKOUT BIT Figure 3. One Time Program Mode Serial Interface Timing Diagram Notes: (1) If CAT5126 is Programmed with less than 5 pulses, it does not change the Power-up recall position. (2) During internal power-up the wiper is forced to miscale; thereafter the wiper is set at the stored position. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-2129 Rev. D CAT5126 PACKAGE OUTLINE DRAWINGS MSOP 8-Lead 3 x 3 mm (Z) (1)(2) SYMBOL MIN NOM MAX A E E1 1.10 A1 0.05 0.10 0.15 A2 0.75 0.85 0.95 b 0.22 c 0.13 D 2.90 0.38 0.23 3.00 3.10 E 4.80 4.90 5.00 E1 2.90 3.00 3.10 e L 0.65 BSC 0.40 0.60 L1 L2 θ 0.80 0.95 REF 0.25 BSC 0º 6º TOP VIEW D A A2 A1 DETAIL A e b c SIDE VIEW END VIEW θ L2 L L1 DETAIL A Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC Specification MO-187. Doc. No. MD-2129 Rev. D 8 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 TDFN 8-Pad 2 mm x 3 mm (VP2) (1)(2) D e A b E2 E PIN#1 IDENTIFICATION A1 PIN#1 INDEX AREA D2 TOP VIEW SIDE VIEW SYMBOL MIN NOM MAX A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A2 0.45 0.55 0.65 A3 b 0.25 A2 A3 D 1.90 2.00 2.10 1.30 1.40 1.50 E 2.90 3.00 3.10 E2 1.20 1.30 1.40 e FRONT VIEW 0.30 D2 L BOTTOM VIEW 0.20 REF 0.20 L 050 TYP 0.20 0.30 0.40 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC Specification MO-229. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 9 Doc. No. MD-2129 Rev. D CAT5126 EXAMPLE OF ORDERING INFORMATION Prefix Device # CAT (1) Suffix 5126 Z I -10 Temperature Range I = Industrial (-40ºC to 85ºC) Company ID Product Number 5126 G T3 Tape & Reel T: Tape & Reel 3: 3,000/Reel Resistance -10: 10 kΩ -50: 50 kΩ -00: 100 kΩ Package Z: MSOP VP2: TDFN – Lead Finish G:NiPdAu ORDERING INFORMATION Orderable Part Number CAT5126VP2I10GT3* Resistor [kΩ] Package-Pin Part Per Reel 10 TDFN 3000 CAT5126VP2I50GT3 (4)* 50 TDFN 3000 CAT5126VP2I00GT3 CAT5126ZI-10-GT3 (4)* 100 TDFN 3000 10 MSOP 3000 CAT5126ZI-50-GT3 (4) 50 MSOP 3000 CAT5126ZI-00-GT3 (4) 100 MSOP 3000 * Part number is not exactly the same as the “Example of Ordering Information” shown above. For part numbers marked with * there are NO hyphens in the orderable part numbers. Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) The device used in the above example is a CAT5126ZI-10-GT3 (MSOP, Industrial Temperature range, 10 kΩ, NiPdAu, Tape & Reel, 3,000/Reel). (4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. Doc. No. MD-2129 Rev. D 10 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 REVISION HISTORY Date Rev. Description 14-Mar-07 A 12-Mar-08 B Initial Issue Add Top Mark Code link Add -MD to document number 21-Nov-08 C Change logo and fine print to ON Semiconductor 13-Jul-09 D Update Ordering Information table ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any 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 without 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 applications 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 situation 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 officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly 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. PUBLICATION ORDERING INFORMATION 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: [email protected] © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 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 11 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative Doc. No. MD-2129 Rev. D