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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 0.35A (typ) static supply current 2.5V to 5.5V single-supply operation 10k, 50k, and 100k 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 The CAT5126 has an end-to-end resistance of 10k, 50k, and 100k. 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 -40C to +85C.
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.
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
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
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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 = +70C) MSOP 8-Lead (derate 4.5mW/C above +70C) TDFN 8-Pad (derate 24.4mW/C above +70C) 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 C C C C
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
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(c) 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 = -40C to +85C, unless otherwise noted. Typical values (1) are at VDD = 5.0V, TA = +25C, 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 V V A pF V A mA V A k 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 = +25C and are guaranteed by design for TA = -40C to +85C. (2) Digital inputs CS and U/D are connected to GND or VDD.
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
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Doc. No. MD-2129 Rev. C
CAT5126 ELECTRICAL CHARACTERISTICS (continued)
VDD = 2.5V to 5.5V, VPP = GND, VH = VDD, VL = GND, TA = -40C to +85C, unless otherwise noted. Typical values are at VDD = 5.0V, TA = +25C, 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) 100k variable resistor configuration, CL = 10pF 100k potentiometer configuration, CL = 10pF 1 s 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 = +25C and are guaranteed by design for TA = -40C to +85C. (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
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(c) 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 = +25C. 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 @ 25C
120 100 80
Wiper Voltage vs. Tap Position
6.0
VDD = 2.5V
5.0 4.0
R W ( )
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
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
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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 10k/50k/100k (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
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(c) 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.
(c) 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 0 6 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
TOP VIEW
D
A
A2
DETAIL A
A1
e SIDE VIEW
b
c END VIEW
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
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(c) 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.
(c) 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 (-40C to 85C) Resistance -10: 10k -50: 50k -00: 100k
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 [k] 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, 10k, 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
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(c) 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. 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: orderlit@onsemi.com 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 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
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Doc. No. MD-2129 Rev. C

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