CAT5126VP2I-10-GT3

CAT5126 One-Time Digitally Programmable 32-Tap Potentiometer FEATURES Wiper position stored after one-time nonvolatile programming 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 10kΩ, 50kΩ, and 100kΩ end-to-end resistances 50ppm/°C end-to-end temperature coefficient and 5ppm/°C ratiometric temperature coefficient TDFN 8-pad (2 x 3mm) and MSOP 8-lead packages 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 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. 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. 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. APPLICATIONS Mechanical potentiometer replacement Products using one-time factory calibration Contrast, brightness, volume controls Programmable analog functions For Ordering Information details, see page 10. PIN CONFIGURATION MSOP (Z) (top view) RW ¯¯¯ CS VDD GND 1 8 RH RL ¯ U/D VPP FUNCTIONAL DIAGRAM RH 8 VDD 3 GND 4 2 UP/DOWN COUNTER 6 32-POSITION DECODER RW 1 RW R30 R31 2 CAT 7 3 5126 6 4 5 CS U/D TDFN (VP2) (top view) RW ¯¯¯ CS VDD GND 1 2 3 4 8 7 6 5 RH RL ¯ U/D VPP VPP 5 ONE-TIME PROGRAM BLOCK R2 R1 7 RL © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 1 Doc. No. MD-2129 Rev. C CAT5126 PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 Name RW ¯¯¯ CS VDD GND VPP ¯ U/D RL RH Function Wiper Connection ¯¯¯ ¯ 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). Power-Supply Voltage Ground 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. ¯¯¯ Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position. Low Terminal of Resistor High Terminal of Resistor 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 ±1.5 362 1951 -40 to +85 +150 -65 to +150 +300 Units V V V mA mW mW 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. C 2 © 2008 SCILLC. All rights reserved. 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 RES RPOT TCRPOT TCRATIO INL DNL RW Parameter Resolution -10 Device End-to-End Resistance TC of Pot Resistance Ratiometric Resistance TC Integral Nonlinearity Differential Nonlinearity Wiper Resistance Potentiometer configuration, no load Potentiometer configuration, no load VDD = 5V VDD = 2.5V 0.7 x VDD 0.3 x VDD ±0.1 5 2.5 (Note 2) VDD = 5V VDD = 2.5V VPP = 10V 0.35 0.25 8.5 6.0 5.5 1 1 10 10 5 ±1 -50 Device -00 Device 8 40 80 Conditions Min Typ 3.2 10 50 100 ±50 ±5 0.5 0.25 70 150 12 60 120 ±300 ±20 1 0.5 100 200 ppm/°C ppm/°C LSB LSB Ω Ω V V µA pF V µA mA V µA kΩ Max Units % DC PERFORMANCE ¯¯¯ ¯ DIGITAL INPUTS (CS, U/D) VIH VIL IIN CIN VDD IDD IDDW VPP IPP Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance Supply Voltage Stand by Current Programming Current Programming Voltage VPP Input Current POWER SUPPLY 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 inputs CS and U/D are connected to GND or VDD. © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 3 Doc. No. MD-2129 Rev. C 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 tCU tCI tIC tIL tIH tIW tPC tCP tCL tCH tPH fU/DMAX ¯ tUP Parameter ¯ ¯¯¯ U/D Mode to CS Setup ¯¯¯ ¯ CS Hold to U/D Mode ¯ ¯¯¯ U/D Step Hold to CS ¯ U/D Step Low Time ¯ U/D Step High Time Wiper Switching Time ¯¯¯ VPP Rising Edge to CS Falling Edge ¯¯¯ CS Falling Edge to VPP Falling Edge ¯¯¯ CS Step Low Time ¯¯¯ CS Step High Time ¯¯¯ VPP Falling Edge to CS Rising Edge ¯ U/D Frequency Power-Up Time (Note 3) 100kΩ variable resistor configuration, CL = 10pF 100kΩ potentiometer configuration, CL = 10pF 1 µs 0.25 Conditions Figures 1, 2 Figures 1, 2 Figures 1, 2 Figures 1, 2 Figures 1, 2 CL = 0pF, Figures 1, 2 Figure 3 Figure 3 Figure 3 Figure 3 Figure 3 1 5 5 5 1 5 1 Min 50 50 0 100 100 100 Typ Max Units ns ns ns ns ns ns ms ms ms ms ms MHz ms tSETTLE Output Settling Time 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. C 4 © 2008 SCILLC. All rights reserved. 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 10 300 IDD programming vs. VDD 9 Valid Programming ICC (uA) 5.5 250 VPP (V) 8 200 7 Invalid Programming 6 150 5 2.5 3.5 4.5 100 2.5 3.5 4.5 5.5 VDD (V) VDD (V) Wiper Resistance vs. Tap Position @ 25°C 120 100 80 Wiper Voltage vs. Tap Position 6.0 VDD = 2.5V 5.0 4.0 R W (Ω ) VDD = 5.0V 60 40 20 0 0 10 20 30 V W (V) 3.0 2.0 1.0 0.0 0 10 20 30 VDD = 5V VDD = 2.5V Tap Position Tap © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 5 Doc. No. MD-2129 Rev. C CAT5126 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 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 ¯ programming sequence is initiated by setting U/D high, applying 10V to VPP, and then taking ¯¯¯ low. Five CS pulses on ¯¯¯ (consisting of ¯¯¯ starting from low and CS CS 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. DETAILED DESCRIPTION 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 (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. 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 1), and into decrement mode if ¯ U/D is low (Figure 2). 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 VDD CS tUP tCU tCI tIL tIH tIC U/D tIW VW Figure 1. Increment Mode Serial Interface Timing Diagram VDD CS tUP tCU U/D tCI tIH tIL tIC tIW VW Figure 2. Decrement Mode Serial Interface Timing Diagram Doc. No. MD-2129 Rev. C 6 © 2008 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 ¯ ¯¯¯ 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 1). ¯¯¯ 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 Factory Default Programming with 5 pulses at the midscale position Programming with 5 pulses different from midscale position – only once Programming with 5 pulses if the power up position was changed before Programming with 6 pulses if the tap position is at midscale Programming ONLY with 6 pulses if the tap position is different from midscale position Power Up Position At midscale At midscale At the new programmed position At the previous programmed position Midscale position forever At the new programmed position Interface Active Active Active Active I2C interface active till power down I2C interface active till power down Operation Programming allowed Programming allowed No further change in powerup position allowed None I2C interface disable after next power-up I2C interface disable after next power-up 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. U/D 10V VPP 0V tCH tPC tCL tCP tPH CS 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. © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-2129 Rev. C CAT5126 PACKAGE OUTLINE DRAWINGS MSOP 8-Lead 3 x 3mm (Z) (1)(2) SYMBOL MIN NOM MAX A A1 A2 b c D E E1 1.10 0.05 0.75 0.22 0.13 2.90 4.80 2.90 0.40 3.00 4.90 3.00 0.65 BSC 0.60 0.95 REF 0.25 BSC 0º 6º 0.80 0.10 0.85 0.15 0.95 0.38 0.23 3.10 5.00 3.10 E E1 e L L1 L2 θ TOP VIEW D A A2 DETAIL A A1 e SIDE VIEW b c 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. C 8 © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 TDFN 8-Pad 2mm x 3mm (VP2) (1)(2) D A e b E E2 PIN#1 IDENTIFICATION A1 PIN#1 INDEX AREA D2 L TOP VIEW SIDE VIEW BOTTOM VIEW SYMBOL A A1 A2 A3 b D D2 E E2 e L MIN 0.70 0.00 0.45 0.20 1.90 1.30 2.90 1.20 0.20 NOM 0.75 0.02 0.55 0.20 REF 0.25 2.00 1.40 3.00 1.30 050 TYP 0.30 MAX 0.80 0.05 0.65 A2 A3 FRONT VIEW 0.30 2.10 1.50 3.10 1.40 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. © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 9 Doc. No. MD-2129 Rev. C CAT5126 EXAMPLE OF ORDERING INFORMATION (1) Prefix CAT Device # 5126 Suffix Z I -10 – G T3 Company ID Product Number 5126 Temperature Range I = Industrial (-40ºC to 85ºC) Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish G:NiPdAu Package Z: MSOP VP2: TDFN ORDERING INFORMATION Ordering Part Number CAT5126VP2I-10-GT3 CAT5126VP2I-50-GT3 CAT5126VP2I-00-GT3 CAT5126ZI-10-GT3 CAT5126ZI-50-GT3 CAT5126ZI-00-GT3 (4) (4) (4) (4) Resistor [kΩ] 10 50 100 10 50 100 Package-Pin TDFN TDFN TDFN MSOP MSOP MSOP Part Per Reel 3000 3000 3000 3000 3000 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 ON Semiconductor Sales office. Doc. No. MD-2129 Rev. C 10 © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT5126 REVISION HISTORY Date 14-Mar-07 12-Mar-08 21-Nov-08 Rev. A B C Reason Initial Issue Add Top Mark Code link Add -MD to document number Change logo and fine print to ON Semiconductor 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. 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