Advance Information
CAT523
Configured Digitally Programmable Potentiometer (DPP): Programmable Voltage Applications
APPLICATIONS
FEATURES
■ Two 8-bit DPPS Configured as Programmable
■ Automated product calibration.
■ Remote control adjustment of equipment
Voltages in DAC-like Applications
■ Buffered Wiper Outputs
■ Offset, gain and zero adjustments in Self-
■ Nonvolatile Wiper Storage
Calibrating and Adaptive Control systems.
■ Output voltage range includes both supply rails
■ 2 independently addressable output wipers
■ 1 LSB Accuracy, High Resolution
■ Serial µP interface
■ Tamper-proof calibrations.
■ DAC (with memory) substitute
■ Single supply operation: 2.7V-5.5V
■ Setting read-back without effecting outputs
DESCRIPTION
The CAT523 is a dual, 8-bit digitally-programmable
potentiometerconfiguredforprogrammablevoltageand
DAC-like applications. Intended for final calibration of
productssuchascamcorders,faxmachinesandcellular
telephones on automated high volume production lines,
it is also well suited for systems capable of self
calibration, and applications where equipment which is
either difficult to access or in a hazardous environment,
requires periodic adjustment.
effecting the stored settings and stored settings can be
read back without disturbing the DAC’s output.
Control of the CAT523 is accomplished with a simple 3
wire serial interface. A Chip Select pin allows several
CAT523's to share a common serial interface and
communication back to the host controller is via a single
serial data line thanks to the CAT523’s Tri-Stated Data
Output pin. A RDY/BSY output working in concert with
aninternallowvoltagedetectorsignalsproperoperation
of non-volatile Erase/Write cycle.
The 2 independently programmable DPPs have a
common output voltage range which includes both
supply rails. The wipers are buffered by rail to rail OP
AMPS. Wiper settings, stored in non-volatile memory,
are not lost when the device is powered down and are
automatically reinstated when power is returned. Each
wiper can be dithered to test new output values without
The CAT523 is available in the 0 to 70° C Commercial
and –40° C to + 85° C Industrial operating temperature
ranges and offered in 14-pin plastic DIP and SOIC
mount packages.
PIN CONFIGURATION
FUNCTIONAL DIAGRAM
RDY/BSY
V
V
H
DD
REF
SOIC Package (J)
DIP Package (P)
14
3
1
H
1
H
1
V
DD
V
V
V
V
V
1
2
3
4
5
6
14
13
12
11
10
9
1
2
3
4
5
6
14
13
12
11
10
9
DD
REF
REF
7
PROGRAM
CONTROL
PROG
CLK
RDY/BSY
CS
CLK
OUT
OUT
2
2
V
V
RDY/BSY
CS
OUT
OUT
CAT
523
CAT
523
NC
NC
5
2
DI
DI
DI
NC
V
NC
V
DATA
REGISTER
AND
13
12
+
+
V
1
2
L
L
OUT
DO
7KΩ
DO
REF
REF
SERIAL
CONTROL
CLK
NONVOLATILE
MEMORY
PROG
GND
PROG
GND
8
7
8
7
4
CS
V
7KΩ
OU
SERIAL
DATA
OUTPUT
6
DO
REGISTER
CAT523
8
9
L
GND
V
REF
© 2001 by Catalyst Semiconductor, Inc.
Doc. No. 25076-00 2/98 M-1
1
Characteristics subject to change without notice