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Advance Information
CAT5112
32-Tap Digitally Programmable Potentiometer (DPPTM) FEATURES
s 32 Position Linear Taper Potentiometer s Non-volatile NVRAM Wiper Storage s Low Power CMOS Technology s Single Supply Operation: 2.5V-6.0V s Increment Up/Down Serial Interface s Resistance Values: 10K, 20K, 50K and 100K s Available in PDIP, SOIC, TSSOP and MSOP packages
APPLICATIONS
s Automated Product Calibration s Remote Control Adjustments s Offset, Gain and Zero Control Systems s Tamper-Proof Calibrations s Contrast, Brightness and Volume Controls s Motor Controls and Feedback Systems s Programmable Analog Functions
DESCRIPTION
The CAT5112 is a single digitally programmable potentiometer (DPPTM) designed as a electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment. The CAT5112 contains a 32-tap series resistor array connected between two terminals RH and RL. An up/ down counter and decoder that are controlled by three input pins, determines which tap is connected to the wiper, RW. The CAT5112 wiper is buffered by an OP AMP that operates rail to rail. The wiper setting, stored in non-volatile NVRAM memory, is not lost when the device is powered down and is automatically recalled when power is returned. The wiper can be adjusted to test new system values without effecting the stored setting. Wiper-control of the CAT5112 is accomplished with three input control pins, CS, U/D, and INC. The INC input increments the wiper in the direction which is determined by the logic state of the U/D input. The CS input is used to select the device and also store the wiper position prior to power down. The digitally programmable potentiometer can be used as a three-terminal resistive divider or as a two-terminal variable resistor. DPPs bring variability and programmability to a wide variety of applications including control, parameter adjustments, and signal processing.
FUNCTIONAL DIAGRAM
VCC
VH /R H
RH U/D INC
CS
Control and Memory
+ -
VW / R W
R WB
RL
VL / R L
VSS
Implementation of the Electronic Potentiometer
(c) 2001 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. 25091-00 Rev. 3/28/01 M-1
CAT5112
PIN CONFIGURATION
DIP/SOIC Package
INC U/D RH GND VCC CS RL RW
Advance Information
PIN FUNCTIONS
TSSOP Package
CS VCC INC U/D RL RW GND RH
Pin Name INC U/D RH GND
Function Increment Control Up/Down Control Potentiometer High Terminal Ground Potentiometer Wiper Terminal Potentiometer Low Terminal Chip Select Supply Voltage
MSOP Package
INC U/D RH GND VCC CS RL RW
RW RL CS VCC
PIN DESCRIPTIONS
INC: INC Increment Control Input The INC input moves the wiper in the up or down direction determined by the condition of the U/D input. U/D: Up/Down Control Input D The U/D input controls the direction of the wiper movement. When in a high state and CS is low, any highto-low transition on INC will cause the wiper to move one increment toward the RH terminal. When in a low state and CS is low, any high-to-low transition on INC will cause the wiper to move one increment towards the RL terminal. RH: High End Potentiometer Terminal RH is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the RL terminal. Voltage applied to the RH terminal cannot exceed the supply voltage, VCC or go below ground, GND. RW: Wiper Potentiometer Terminal RW is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, INC, U/D and CS. Voltage applied to the RW terminal cannot exceed the supply voltage, VCC or go below ground, GND. RL: Low End Potentiometer Terminal RL is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the RH terminal. Voltage applied to the RL terminal cannot exceed the supply voltage, VCC or go below ground, GND. RL and RH are electrically interchangeable. CS: CS Chip Select The chip select input is used to activate the control input of the CAT5112 and is active low. When in a high state, activity on the INC and U/D inputs will not affect or change the position of the wiper.
DEVICE OPERATION
The CAT5112 operates like a digitally controlled potentiometer with RH and RL equivalent to the high and low terminals and RW equivalent to the mechanical potentiometer's wiper. There are 32 available tap positions including the resistor end points, RH and RL. There are 31 resistor elements connected in series between the RH and R L terminals. The wiper terminal is connected to one of the 32 taps and controlled by three inputs, INC, U/D and CS. These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. The selected wiper position can be stored in nonvolatile memory using the INC and CS inputs. With CS set LOW the CAT5112 is selected and will respond to the U/D and INC inputs. HIGH to LOW transitions on INC wil increment or decrement the wiper (depending on the state of the U/D input and fivebit counter). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. The value of the counter is stored in nonvolatile memory whenever CS transitions HIGH while the INC input is also HIGH. When the CAT5112 is powered-down, the last stored wiper counter position is maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the counter is set to the value stored. With INC set low, the CAT5112 may be de-selected and powered down without storing the current wiper position in nonvolatile memory. This allows the system to always power up to a preset value stored in nonvolatile memory.
Doc. No. 25091-00 Rev. 3/01 M-1
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Advance Information OPERATION MODES
RH
CAT5112
INC High to Low High to Low High Low X
CS Low Low Low to High Low to High High
U/D High Low X X X
Operation W toward H W toward L Store Wiper Position No Store, Return to Standby Standby
CH
Rwi RW CW
CL
RL
Potentiometer Equivalent Circuit
ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC to GND ...................................... -0.5V to +7V Inputs CS to GND .............................-0.5V to VCC +0.5V INC to GND ............................-0.5V to VCC +0.5V U/D to GND ............................-0.5V to VCC +0.5V H to GND ................................-0.5V to VCC +0.5V L to GND ................................-0.5V to VCC +0.5V W to GND ............................... -0.5V to VCC +0.5V RELIABILITY CHARACTERISTICS Symbol
VZAP(1) ILTH(1)(2) TDR NEND
Operating Ambient Temperature Commercial (`C' suffix) .................... 0C to +70C Industrial (`I' suffix) ...................... - 40C to +85C Junction Temperature ..................................... +150C Storage Temperature ....................... -65C to +150C Lead Soldering (10 sec max) .......................... +300C
* Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Absolute Maximum Ratings are limited values applied individually while other parameters are within specified operating conditions, and functional operation at any of these conditions is NOT implied. Device performance and reliability may be impaired by exposure to absolute rating conditions for extended periods of time.
Parameter
ESD Susceptibility Latch-Up Data Retention Endurance
Min
2000 100 100 1,000,000
Max
Units
Volts mA Years Stores
Test Method
MIL-STD-883, Test Method 3015 JEDEC Standard 17 MIL-STD-883, Test Method 1008 MIL-STD-883, Test Method 1003
DC Electrical Characteristics: VCC = +2.5V to +6.0V unless otherwise specified Power Supply Symbol Parameter Conditions Min
VCC ICC1 ICC2 ISB1 (2) Operating Voltage Range Supply Current (Increment) CAT5114 Supply Current (Write) Supply Current (Standby) CAT5114 VCC = 6V, f = 1MHz, IW=0 VCC = 6V, f = 250KHz, IW=0 Programming, VCC = 6V VCC = 3V CS=VCC-0.3V U/D, INC=VCC-0.3V or GND 2.5 -- -- -- -- --
Typ
-- -- -- -- -- --
Max
6.0 100 50 1 500 1
Units
V A mA A A
Logic Inputs Symbol
IIH IIL VIH1 VIL1 VIH2 VIL2
NOTES: (1) (2) (3) (4)
Parameter
Input Leakage Current Input Leakage Current TTL High Level Input Voltage TTL Low Level Input Voltage CMOS High Level Input Voltage CMOS Low Level Input Voltage
Conditions
VIN = VCC VIN = 0V 4.5V VCC 5.5V 2.5V VCC 6V
Min
-- -- 2 0 VCC x 0.7 -0.3
Typ
-- -- -- -- -- --
Max
10 -10 VCC 0.8 VCC + 0.3 VCC x 0.2
Units
A A V V V V
This parameter is tested initially and after a design or process change that affects the parameter. Latch-up protection is provided for stresses up to 100mA on address and data pins from -1V to VCC + 1V IW=source or sink These parameters are periodically sampled and are not 100% tested.
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Doc. No. 25091-00 Rev. 3/01 M-1
CAT5112
Potentiometer Parameters Symbol RPOT Parameter Potentiometer Resistance Conditions Min
Advance Information
Typ 10K 20K 50K 100K
Max
Units
Pot Resistance Tolerance VRH VRL INL DNL RWi IW TCRPOT TCRATIO RISO VN CH/CL/CW Voltage on RH pin Voltage on RL pin Resolution Integral Linearity Error Differential Linearity Error Wiper Resistance Wiper Current TC of Pot Resistance Ratiometric TC Isolation Resistance Noise Potentiometer Capacitances 10/10/25 IW 2A IW 2A VCC = 5V, IW = 1mA VCC = 2.5V, IW = 1mA OV OV 3.2 0.5 0.25
15 VCC VCC 1 .5 400 1K 1
% V V % LSB LSB mA ppm/oC ppm/oC nV/Hz pF
Doc. No. 25091-00 Rev. 3/01 M-1
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Advance Information AC CONDITIONS OF TEST VCC Range Input Pulse Levels Input Rise and Fall Times Input Reference Levels 2.5V VCC 6V 0.2VCC to 0.7VCC 10ns 0.5VCC
CAT5112
AC OPERATING CHARACTERISTICS: VCC = +2.5V to +6.0V, VH = VCC, VL = 0V, unless otherwise specified Symbol
tCI tDI tID tIL tIH tIC tCPH tCPH tIW tCYC tR, tF(2) tPU(2) tR VCC(2) tWR
Parameter Min
CS to INC Setup U/D to INC Setup U/D to INC Hold INC LOW Period INC HIGH Period INC Inactive to CS Inactive CS Deselect Time (NO STORE) CS Deselect Time (STORE) INC to VOUT Change INC Cycle Time INC Input Rise and Fall Time Power-up to Wiper Stable VCC Power-up Rate Store Cycle 100 50 100 250 250 1 100 10 -- 1 -- -- 0.2 --
Limits Typ(1)
-- -- -- -- -- -- -- -- 1 -- -- -- -- 5
Max
-- -- -- -- -- -- -- -- 5 -- 500 1 msec 50 10
Units
ns ns ns ns ns s ns ms s s s msec V/ms ms
A. C. TIMING
CS tCYC tIL tIH
(store)
tCI INC
tIC
tCPH
90% 10% 90%
tDI
tID
U/D
tF
tR
tIW W
MI (3)
(1) Typical values are for TA=25oC and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. (3) MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position.
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Doc. No. 25091-00 Rev. 3/01 M-1
CAT5112
Advance Information
ORDERING INFORMATION
Prefix CAT Device # 5112 Suffix S I -10 TE13
Optional Company ID
Product Number 5112: Buffered 5114: Unbuffered
Package P: PDIP S: SOIC U: TSSOP R: MSOP
Resistance -10: 10K Ohms -20: 20K Ohms -50: 50K Ohms -00: 100K Ohms
Tape & Reel TE13: 2000/Reel
Temperature Range Blank = Commercial (0C to +70C) I = Industrial (-40C to +85C)
Notes: (1) The device used in the above example is a CAT5112 SI-10TE13 (SOIC, 10K Ohms, Industrial Temperature, Tape & Reel)
Doc. No. 25091-00 Rev. 3/01 M-1
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