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Part: CAT514
Category:
Analog & Mixed-Signal Processing
Description: 8-bit Quad Digital Pot
Company: Catalyst Semiconductor
Datasheet: Download CAT514 datasheet File size : 32 kB
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Datasheet text preview:
CAT5114
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, 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 s Tamper-proof calibrations s Contrast, brightness and volume controls s Motor controls and feedback systems s Programmable analog functions
DESCRIPTION
The CAT5114 is a single digitally programmable p o t e n t i o m e t e r (DPPTM) designed as a electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume p r o d u c t i o n lines, they are also well suited for a p p l i c a t i o n s where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment. The CAT5114 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 wiper setting, stored in nonvolatile memory, is not lost when the device is powered down and is automatically reinstated when power i s returned. The wiper can be adjusted to test n e w system values without effecting the stored s e t t i n g . Wiper-control of the CAT5114 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 i n c l u d i n g control, parameter adjustments, and signal processing.
FUNCTIONAL DIAGRAM
Vcc (Supply Voltage)
U/D INC CS
5-BIT UP/DOWN COUNTER 31 R H / VH
VH /R H
30
R H / VH
UP/DOWN (U/D) INCREMENT (INC) DEVICE SELECT (CS)
POR
29 5-BIT NONVOLATILE MEMORY ONE 28 OF THIRTY TWO DECODER
Control and Memory
R W / VW
TRANSFER GATES
RESISTOR ARRAY
VW / R W
2
R L / VL
Vcc
STORE AND RECALL CONTROL CIRCUITRY 1
GND GENERAL
VSS
0 R L / VL R W / VW
VL / R L
GENERAL
DETAILED
ELECTRONIC POTENTIOMETER IMPLEMENTATION
© 2002 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. 2007, Rev. E
CAT5114
PIN CONFIGURATION
DIP/SOIC Package
INC U/D RH GND 1 2 3 4 8 7 6 5 VC C CS RL RW
CS VCC INC U/D
PIN FUNCTIONS
TSSOP Package
1 2 3 4 8 7 6 5 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 1 2 3 4 8 7 6 5 VCC CS RL RW
RW RL CS VCC
PIN DESCRIPTIONS
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 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 b e l o w ground, GND. R L and R H are electrically interchangeable. CS: Chip Select The chip select input is used to activate the control input of the CAT5114 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 CAT5114 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 t h e 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 CAT5114 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 CAT5114 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 CAT5114 may be de-selected and powered down without storing the current wiper p o s i t i o n in nonvolatile memory. This allows the system to always power up to a preset value stored in nonvolatile memory.
Doc. No. 2007, Rev. E
2
CAT5114
OPERATION MODES
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
CL RL CH RH Rwi RW CW
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' or Blank suffix) ...... 0°C to +70°C Industrial (`I' suffix) .... 40°C to +85°C Junction Temperature .... +150°C Storage Temperature ..... 65°C to +150°C Lead Soldering (10 sec max) .. +300°C
* 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
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
-- -- -- -- -- --
Max
6.0 100 50 1 500 1
Units
V µA mA µA µA
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
µA µA 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. 2007, Rev. E
CAT5114
Potentiometer Parameters Symbol RPOT Parameter Potentiometer Resistance Conditions -10 Device -50 Device -00 Device Pot Resistance Tolerance VRH VRL INL DNL RWi IW TCRPOT TCRATIO RISO VN CH/CL/CW fc 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 Frequency Response Passive Attenuator, 10k 100kHz / 1kHz TBD 8/24 8/8/25 1.7 300 20 IW 2µA IW 2µA VCC = 5V, IW = 1mA VCC = 2.5V, IW = 1mA 0 0 3.2 0.5 0.25 1 0.5 400 1 1 Min Typ 10 50 100 ±15 VCC VCC % V V % LSB LSB k mA ppm/oC ppm/oC nV/Hz pF MHz k Max Units
Doc. No. 2007, Rev. E
4
CAT5114
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 µs ns ms µs µs µs 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=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. 2007, Rev. E
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