CAT5126 One‐time Digital 32‐tap Potentiometer (POT) Description The CAT5126 is a digital POT. 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 kW, 50 kW, and 100 kW. 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 −40C to +85C. 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 mA (typ) Static Supply Current 2.5 V to 5.5 V Single-supply Operation 10 kW, 50 kW, and 100 kW End-to-End Resistances 50 ppm/C End-to-End Temperature Coefficient and 5 ppm/C Ratiometric Temperature Coefficient TDFN 8-pad (2 3 mm) and MSOP 8-lead Packages These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant TDFN−8 VP2 SUFFIX CASE 511AK PIN CONFIGURATIONS RW CS VDD GND RH RL U/D VPP MSOP (Z) RW CS VDD GND 1 RH RL U/D VPP TDFN (VP2) (Top Views) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. Applications MSOP−8 Z SUFFIX CASE 846AD 1 Features http://onsemi.com Mechanical Potentiometer Replacement Products using One-time Factory Calibration Contrast, Brightness, Volume Controls Programmable Analog Functions Semiconductor Components Industries, LLC, 2013 June, 2013 − Rev. 4 1 Publication Order Number: CAT5126/D CAT5126 RH VDD GND CS U/D 8 3 R31 4 2 UP/DOWN COUNTER R30 6 RW 32−POSITION DECODER VPP 5 ONE−TIME PROGRAM BLOCK 1 RW R2 R1 RL 7 Figure 1. Functional Diagram Table 1. PIN DESCRIPTION Pin Name Function 1 RW 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 VDD Power−Supply Voltage 4 GND Ground 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 Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position. 7 RL Low Terminal of Resistor 8 RH High Terminal of Resistor Table 2. ABSOLUTE MAXIMUM RATINGS Parameters Ratings Units VDD to GND −0.5 to +7.0 V VPP to GND −0.5 to +12.0 V All other pins to GND −0.5 to VDD +0.5 V Maximum Continuous Current into H, L, and W 1.5 mA Continuous Power Dissipation (TA = +70C) MSOP 8-lead (derate 4.5 mW/C above +70C) TDFN 8-pad (derate 24.4 mW/C above +70C) 362 1951 Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10 s) mW −40 to +85 C +150 C −65 to +150 C +300 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. http://onsemi.com 2 CAT5126 Table 3. ELECTRICAL CHARACTERISTICS (VDD = 2.5 V to 5.5 V, VPP = GND, RH = VDD, RL = GND, TA = −40C to +85C, unless otherwise noted. Typical values are at VDD = 5.0 V, TA = +25C, unless otherwise noted.) (Note 1) Symbol Parameter Conditions Min Typ Max Units DC PERFORMANCE RES Resolution RPOT End−to−End Resistance TCRPOT TC of Pot Resistance TCRATIO Ratiometric Resistance TC 3.2 % −10 Device 8 10 12 kW −50 Device 40 50 60 −00 Device 80 100 120 50 300 ppm/C 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 RW Wiper Resistance VDD = 5 V 70 100 W VDD = 2.5 V 150 200 DIGITAL INPUTS (CS, U/D) 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 mA 5 pF POWER SUPPLY VDD Supply Voltage IDD Stand by Current IDDW Programming Current VPP Programming Voltage IPP VPP Input Current 2.5 (Note 2) 5.5 V 0.35 1 mA 0.25 1 mA VDD = 5 V 8.5 10 V VDD = 2.5 V 6.0 10 VPP = 10 V 5 mA TIMING CHARACTERISTICS (Note 3) tCU U/D Mode to CS Setup Figures 6, 7 50 ns tCI CS Hold to U/D Mode Figures 6, 7 50 ns tIC U/D Step Hold to CS Figures 6, 7 0 ns tIL U/D Step Low Time Figures 6, 7 100 ns tIH U/D Step High Time Figures 6, 7 100 ns tIW Wiper Switching Time CL = 0 pF, Figures 6, 7 tPC VPP Rising Edge to CS Falling Edge Figure 8 1 ms tCP CS Falling Edge to VPP Falling Edge Figure 8 5 ms tCL CS Step Low Time Figure 8 5 ms tCH CS Step High Time Figure 8 5 ms tPH VPP Falling Edge to CS Rising Edge Figure 8 1 ms fU/DMAX 1. 2. 3. 4. U/D Frequency 100 ns 5 All devices are production tested at TA = +25C and are guaranteed by design for TA = −40C to +85C. Digital inputs CS and U/D are connected to GND or VDD. Digital timing is guaranteed by design, not production tested. Power-up time is the period of time from when the power supply is applied until the serial interface is ready for writing. http://onsemi.com 3 MHz CAT5126 Table 3. ELECTRICAL CHARACTERISTICS (VDD = 2.5 V to 5.5 V, VPP = GND, RH = VDD, RL = GND, TA = −40C to +85C, unless otherwise noted. Typical values are at VDD = 5.0 V, TA = +25C, unless otherwise noted.) (Note 1) (continued) Symbol Parameter Conditions Min Typ Max Units 1 ms TIMING CHARACTERISTICS (Note 3) tUP Power-up Time tSETTLE 1. 2. 3. 4. (Note 4) Output Settling Time 100 kW variable resistor configuration, CL = 10 pF 1 100 kW potentiometer configuration, CL = 10 pF 0.25 ms All devices are production tested at TA = +25C and are guaranteed by design for TA = −40C to +85C. Digital inputs CS and U/D are connected to GND or VDD. Digital timing is guaranteed by design, not production tested. 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 (VDD = 2.5 V to 5.5 V, VPP = GND, VH = VDD, VL = GND, TA = +25C) 10 300 Valid Programming 250 8 ICC (mA) VPP (V) 9 7 5 150 Invalid Programming 6 2.5 3.5 4.5 200 100 5.5 2.5 3.5 4.5 5.5 VDD (V) VDD (V) Figure 2. VPP vs. VDD Figure 3. IDD Programming vs. VDD 120 6 100 5 80 4 VW (V) RW (W) VDD = 2.5 V 60 VDD = 5.0 V 40 VDD = 5.0 V 3 2 VDD = 2.5 V 20 0 1 0 10 20 0 30 0 10 20 TAP POSITION TAP Figure 4. Wiper Resistance vs. Tap Position @ 255C Figure 5. Wiper Voltage vs. Tap Position http://onsemi.com 4 30 CAT5126 Detailed Description The CAT5126 devices are 10 kW/50 kW/100 kW (end-to-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 (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. 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 VPP, and then taking CS low. Five pulses on CS (consisting of CS starting from low and going high for tCH and then low for tCL) program the device (Figure 8). 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 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. VDD CS tUP tCU tCI tIL tIH tIC U/D tIW VW Figure 6. Increment Mode Serial Interface Timing Diagram VDD CS U/D tUP tCU tCI tIH tIL tIW VW Figure 7. Decrement Mode Serial Interface Timing Diagram http://onsemi.com 5 tIC CAT5126 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 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. 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). 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 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 10 V VPP 0V tCH tCP tCL CS tPC 5 BITS PROGRAM WIPER POSITION OPTIONAL LOCKOUT BIT Figure 8. One Time Program Mode Serial Interface Timing Diagram 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. http://onsemi.com 6 tPH CAT5126 PACKAGE DIMENSIONS MSOP 8, 3x3 CASE 846AD ISSUE O SYMBOL MIN NOM MAX 1.10 A E A1 0.05 0.10 0.15 A2 0.75 0.85 0.95 b 0.22 0.38 c 0.13 0.23 D 2.90 3.00 3.10 E 4.80 4.90 5.00 E1 2.90 3.00 3.10 E1 0.65 BSC e L 0.60 0.40 0.80 L1 0.95 REF L2 0.25 BSC θ 0º 6º TOP VIEW D A A2 A1 DETAIL A e b c SIDE VIEW END VIEW q L2 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187. L L1 DETAIL A http://onsemi.com 7 CAT5126 PACKAGE DIMENSIONS TDFN8, 2x3 CASE 511AK ISSUE A D A e 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 A2 A3 0.20 0.25 0.30 D 1.90 2.00 2.10 D2 1.30 1.40 1.50 E 2.90 3.00 3.10 E2 1.20 1.30 1.40 L BOTTOM VIEW 0.20 REF b e FRONT VIEW 0.50 TYP 0.20 0.30 L 0.40 Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229. http://onsemi.com 8 CAT5126 Table 5. ORDERING INFORMATION Resistor (kW) Package−Pin Shipping† CAT5126VP2I10GT3 10 TDFN−8 3000 / Tape & Ree CAT5126ZI−10−G 10 MSOP−8 96 / Tube CAT5126ZI−10−GT3 10 MSOP−8 3000 / Tape & Ree CAT5126ZI−50−GT3 (Note 10) 50 MSOP−8 3000 / Tape & Ree CAT5126ZI−00−GT3 (Note 10) 100 MSOP−8 3000 / Tape & Ree Orderable Part Numbers †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 7. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device Nomenclature document, TND310/D, available at www.onsemi.com. 8. All packages are RoHS-compliant (Lead-free, Halogen-free). 9. The standard lead finish is NiPdAu. 10. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. 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. 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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] 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: 81−3−5817−1050 http://onsemi.com 9 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CAT5126/D