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Part: CAT513
Category:
Analog & Mixed-Signal Processing
-> Potentiometers
-> Digital Potentiometers
Description: 32-Tap, Volatile DPP With INC/DEC, Up/down Interface<<<>>>the CAT5115 is a Single Digitally Programmable<<<>>>potentiometer (DPP ) 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.
Company: Catalyst Semiconductor
Datasheet: Download CAT513 datasheet File size : 32 kB
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Datasheet text preview:
Preliminary Information
CAT5115
32-Tap Digitally Programmable Potentiometer (DPPTM) FEATURES
s 32-position, linear-taper potentiometer s Low power CMOS technology s Single supply operation: 2.5V-5.5V s Increment up/down serial interface s Resistance values: 10k, 50k and 100k s Available in PDIP, SOIC, TSSOP and MSOP packages
H
GEN FR ALO
EE
LE
APPLICATIONS
s Automated product calibration s Remote control adjustments s Offset, gain and zero control s Tamper-proof calibrations
A D F R E ETM
s Contrast, brightness and volume controls s Motor controls and feedback systems s Programmable analog functions
DESCRIPTION
The CAT5115 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 CAT5115 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 is always set to the mid point, tap 15 at power up. The tap position is not stored in memory. Wiper-control of the CAT5115 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. 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. For a pin-compatible device that recalls a stored tap position on power-up refer to the CAT5114 data sheet.
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
Control and Memory
R W / VW
ONE 28 OF THIRTY TWO DECODER
TRANSFER GATES
RESISTOR ARRAY
VW / R W
2
R L / VL
Vcc
CONTROL CIRCUITRY 1
GND GENERAL
V SS
0 R L / VL R W / VW
VL / R L
GENERAL
DETAILED
ELECTRONIC POTENTIOMETER IMPLEMENTATION
© 2004 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. 2117, Rev. E
CAT5115
PIN CONFIGURATION
DIP Package (P, L)
INC U/D RH GND 1 2 3 4 8 7 6 5 VCC CS RL RW
PIN FUNCTIONS
TSSOP Package (U, Y)
CS VCC INC U/D 1 2 3 4 8 7 6 5 RL RW GND RH
Pin Name INC U/D RH GND RW
Function Increment Control Up/Down Control Potentiometer High Terminal Ground Potentiometer 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 RW
MSOP Package (R, Z)
INC U/D RH GND 1 2 3 4 8 7 6 5 VCC CS RL 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 CAT5115 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 CAT5115 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 RL 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. With CS set LOW the CAT5115 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. When the CAT5115 is powereddown, the wiper position is reset. When power is restored, the counter is set to the mid point, tap 15.
Doc. No. 2117, Rev. E
2
CAT5115
OPERATION MODES INC High to Low High to Low X CS Low Low High U/D High Low X Operation Wiper toward H Wiper toward L Standby
CL CH RH Rwi RW CW
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 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 +5.5V 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 = 5.5V, f = 1MHz, IW=0 VCC = 5.5V, f = 250kHz, IW=0 Programming, VCC = 5.5V VCC = 3V CS=VCC-0.3V U/D, INC=VCC-0.3V or GND 2.5 -- -- -- -- --
Typ
-- -- -- -- -- --
Max
5.5 100 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 5.5V
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. 2117, Rev. E
CAT5115
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 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 Noise Potentiometer Capacitances Frequency Response Passive Attenuator, 10k 100kHz / 1kHz 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 ± 20 VCC VCC % V V % LSB LSB k mA ppm/oC ppm/oC nV/Hz pF MHz k Max Units
Doc. No. 2117, Rev. E
4
CAT5115
AC CONDITIONS OF TEST VCC Range Input Pulse Levels Input Rise and Fall Times Input Reference Levels 2.5V VCC 5.5V 0.2VCC to 0.7VCC 10ns 0.5VCC
AC OPERATING CHARACTERISTICS: VCC = +2.5V to +5.5V, VH = VCC, VL = 0V, unless otherwise specified Symbol
tCI tDI tID tIL tIH tIC tCPH tCPH tIW tCYC tR, tF(2) tPU(2) t WR
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. 2117, Rev. E
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