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 2wire serial interface Low 0.35µA (typ) static supply current 2.5V to 5.5V single-supply operation The CAT5126 has an end-to-end resistance of 10kΩ, 50kΩ, and 100kΩ. All CAT5126 devices have 32-wiper positions and operate from a single 2.5V to 5.5V supply. 10kΩ, 50kΩ, and 100kΩ end-to-end resistances 50ppm/°C end-to-end temperature coefficient and 5ppm/°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 3mm) 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 PIN CONFIGURATION FUNCTIONAL DIAGRAM MSOP (Z) (top view) 1 RH 8 VDD 3 8 RH ¯¯¯ CS 2 CAT 7 RL VDD 3 5126 6 ¯ U/D CS 4 VPP U/D RW GND 5 GND 2 1 2 3 4 8 7 6 5 R30 UP/DOWN COUNTER 6 RW 32-POSITION DECODER TDFN (VP2) (top view) RW ¯¯¯ CS VDD GND R31 4 RH RL ¯ U/D VPP VPP 5 ONE-TIME PROGRAM BLOCK R2 R1 7 RL © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. MD-2129 Rev. B 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 10V 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, 10s) 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. B 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5126 ELECTRICAL CHARACTERISTICS VDD = 2.5V to 5.5V, VPP = GND, RH = VDD, RL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values (1) are at VDD = 5.0V, 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 = 5V 70 100 Ω VDD = 2.5V 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 = 5V 8.5 10 VDD = 2.5V 6.0 10 (Note 2) VPP = 10V 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 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. MD-2129 Rev. B CAT5126 ELECTRICAL CHARACTERISTICS (continued) VDD = 2.5V to 5.5V, VPP = GND, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 5.0V, 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 = 0pF, 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) 100kΩ variable resistor configuration, CL = 10pF 1 100kΩ potentiometer configuration, CL = 10pF 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. B 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5126 TYPICAL OPERATING CHARACTERISTICS VDD = 2.5V to 5.5V, 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 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 10 20 30 Tap 5 Doc. No. MD-2129 Rev. B 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 10kΩ/50kΩ/100kΩ (end-toend 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 10V 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. B 6 © Catalyst Semiconductor, Inc. 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. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. MD-2129 Rev. B CAT5126 PACKAGE OUTLINE DRAWINGS MSOP 8-Lead 3 x 3mm (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 For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC Specification MO-187. Doc. No. MD-2129 Rev. B 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5126 TDFN 8-Pad 2mm x 3mm (VP2) (1)(2) 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 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 e L BOTTOM VIEW A2 A3 0.20 REF b L FRONT VIEW 050 TYP 0.20 0.30 0.40 For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC Specification MO-229. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 9 Doc. No. MD-2129 Rev. B CAT5126 EXAMPLE OF ORDERING INFORMATION Prefix Device # CAT (1) Suffix 5126 Z I -10 – G Temperature Range I = Industrial (-40ºC to 85ºC) Company ID Product Number 5126 Tape & Reel T: Tape & Reel 3: 3,000/Reel Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ Package Z: MSOP VP2: TDFN T3 Lead Finish G:NiPdAu ORDERING INFORMATION Ordering Part Number Resistor [kΩ] Package-Pin Part Per Reel CAT5126VP2I-10-GT3 10 TDFN 3000 CAT5126VP2I-50-GT3 (4) 50 TDFN 3000 CAT5126VP2I-00-GT3 (4) 100 TDFN 3000 CAT5126ZI-10-GT3 10 MSOP 3000 CAT5126ZI-50-GT3 (4) 50 MSOP 3000 CAT5126ZI-00-GT3 (4) 100 MSOP 3000 For Product Top Mark Codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp 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, 10kΩ, NiPdAu, Tape & Reel, 3,000/Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. Doc. No. MD-2129 Rev. B 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice REVISION HISTORY Date Rev. 03/14/07 A 03/12/08 B Reason Initial Issue Add Top Mark Code link Add -MD to document number Copyrights, Trademarks and Patents © Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive Analog™, Beyond Memory™, DPP™, EZDim™, LDD™, MiniPot™, Quad-Mode™ and Quantum Charge Programmable™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. 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Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 1Hwww.catsemi.com Document No: MD-2129 Revision: B Issue date: 03/12/08