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CAT5112
32-Tap Digitally Programmable Potentiometer (DPPTM) with Buffered Wiper FEATURES
s 32-position linear taper potentiometer s Non-volatile NVRAM wiper storage;
H
GEN FR ALO
EE
LE
A D F R E ETM
APPLICATIONS
s Automated product calibration s Remote control adjustments s Offset, gain and zero control s Tamper-proof calibrations s Contrast, brightness and volume controls s Motor controls and feedback systems s Programmable analog functions
buffered wiper
s Low power CMOS technology s Single supply operation: 2.5V-6.0V s Increment up/down serial interface s Resistance values: 10k, 50k and 100k , s Available in PDIP, SOIC, TSSOP and MSOP packages
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, RWB. 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 FUNCTIONAL DIAGRAM
VCC
RH
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 buffered voltage divider. For applications where the potentiometer is used as a 2-terminal variable resistor, please refer to the CAT5114. The buffered wiper of the CAT5112 is not compatible with that application. DPPs bring variability and programmability to a broad range of applications and are used primarily to control, regulate or adjust a characteristic or parameter of an analog circuit.
RH U/D INC
CS
Power On Recall
+ -
>
Control and Memory
+ -
RWB
R WB
RL
RL
VSS
Electronic Potentiometer Implementation
(c) 2004 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Doc. No. 2002, Rev. L
1
CAT5112
PIN CONFIGURATION
PDIP Package (P, L)
INC U/D RH GND 1 2 3 4 8 7 6 5 VCC CS RL RWB
PIN FUNCTIONS
TSSOP Package (U, Y)
CS VCC INC U/D 1 2 3 4 8 7 6 5 RL RWB GND RH
Pin Name INC U/D RH GND
Function Increment Control Up/Down Control Potentiometer High Terminal Ground Buffered Wiper Terminal Potentiometer Low Terminal Chip Select Supply Voltage
SOIC Package (S, V)
INC U/D RH GND 1 2 3 4 8 7 6 5 VCC CS RL RWB
MSOP Package (R, Z)
INC U/D RH GND 1 2 3 4 8 7 6 5 VCC CS RL RWB
RWB RL CS VCC
PIN DESCRIPTIONS
INC Increment Control Input INC: The INC input (on the falling edge) moves the wiper in the up or down direction determined by the condition of the U/D input. D U/D: Up/Down Control Input 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. RWB: Wiper Potentiometer Terminal (Buffered) RWB is the buffered wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, INC, U/D and CS. 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. R L and R H are electrically interchangeable. CS Chip Select CS: 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 RWB 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 R H 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. 2002, Rev. L
2
CAT5112
OPERATING MODES
RH
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 Wiper toward H Wiper toward L Store Wiper Position No Store, Return to Standby Standby
CH
Rwi RWB CW
CL
RL
Potentiometer Equivalent Circuit
ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC to GND Inputs CS to GND INC to GND U/D to GND RH to GND RL to GND RWB to GND -0.5V to +7V -0.5V to VCC +0.5V -0.5V to VCC +0.5V -0.5V to VCC +0.5V -0.5V to VCC +0.5V -0.5V to VCC +0.5V -0.5V to VCC +0.5V
Operating Ambient Temperature Commercial (`C' or Blank 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.
RELIABILITY CHARACTERISTICS Symbol
VZAP(1) ILTH(1)(2) TDR NEND
Parameter
ESD Susceptibility Latch-Up Data Retention Endurance
Test Method
MIL-STD-883, Test Method 3015 JEDEC Standard 17 MIL-STD-883, Test Method 1008 MIL-STD-883, Test Method 1003
Min
2000 100 100 1,000,000
Typ
Max
Units
Volts mA Years Stores
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) Supply Current (Write) Supply Current (Standby) 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
-- -- -- -- -- 75
Max
6.0 200 100 1 500 150
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.
3
Doc. No. 2002, Rev. L
CAT5112
Potentiometer Parameters Symbol RPOT Parameter Potentiometer Resistance Conditions -10 Device -50 Device -00 Device Pot Resistance Tolerance VRH VRL Voltage on RH pin Voltage on RL pin Resolution INL DNL ROUT IOUT TCRPOT TCRATIO RISO Integral Linearity Error Differential Linearity Error Buffer Output Resistance Buffer Output Current TC of Pot Resistance Ratiometric TC Isolation Resistance IW 2A IW 2A
.05VCC VWB .95VCC, VCC=5V .05VCC VWB .95VCC, VCC=5V
Min
Typ 10 50 100
Max
Units
k 20 % V V % 1 0.5 1 3 LSB LSB mA ppm/C ppm/C pF MHz
.99VCC
0 0 1 0.5 0.25
VCC VCC
300 TBD TBD 8/8/25 Passive Attenuator, 10k IOUT100A, VCC=5V
0.01VCC
CRH/CRL/CRW Potentiometer Capacitances fc VWB(SWING) Frequency Response Output Voltage Range
1.7
Doc. No. 2002, Rev. L
4
CAT5112
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
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) tWR
Parameter
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 Store Cycle
Min
100 50 100 250 250 1 100 10 -- 1 -- -- --
Typ(1)
-- -- -- -- -- -- -- -- 1 -- -- -- 5
Max
-- -- -- -- -- -- -- -- 5 -- 500 1 10
Units
ns ns ns ns ns s ns ms s s s msec ms
A. C. TIMING
CS tCYC tIL tIH
(store)
tCI INC
tIC
tCPH
90% 10% 90%
tDI
tID
U/D
tF
tR
tIW RW
MI (3)
(1) Typical values are for TA=25C 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. 2002, Rev. L
CAT5112
ORDERING INFORMATION
Prefix CAT Device # 5112 Suffix S I -10 TE13
Optional Company ID
Product Number 5112: Buffered 5114: Unbuffered
Resistance -10: 10kohms -50: 50kohms -00: 100kohms
Tape & Reel SOIC: 2000/Reel TSSOP: 2000/Reel MSOP: 2500/Reel
Package P: PDIP S: SOIC U: TSSOP R: MSOP L: PDIP (Lead free, Halogen free) V: SOIC (Lead free, Halogen free) Y: TSSOP (Lead free, Halogen free) Z: MSOP (Lead free, Halogen free)
Temperature Range Blank = Commercial (0C to +70C) I = Industrial (-40C to +85C)
Doc. No. 2002, Rev. L
6
CAT5112
REVISION HISTORY
Date 3/10/2004 3/29/2004 4/12/2004 Rev. J K L Reason Updated Potentiometer Parameters Changed Green Package marking for SOIC from W to V Updated Reel Ordering Information
Notes: (1) The device used in the above example is a CAT5112 SI-10TE13 (SOIC, 10K Ohms, Industrial Temperature, Tape & Reel)
Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP TM AE2 TM
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents issued to Catalyst Semiconductor contact the Company's corporate office at 408.542.1000.
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Catalyst Semiconductor 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 Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. 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 1250 Borregas Avenue Sunnyvale, CA 94089 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com
Publication #: Revison: Issue date: Type:
2002 L 4/12/04 Final
7
Doc. No. 2002, Rev. L

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