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
Voltage Sources in DAC-like Applications
■ Common Reference Inputs
■ Offset, gain and zero adjustments in Self-
■ Non-volatile NVRAM Memory Wiper Storage
■ Output voltage range includes both supply rails
Calibrating and Adaptive Control systems.
■ Tamper-proof calibrations.
■ 2 independently addressable buffered
■ DAC (with memory) substitute
output wipers
■ 1 LSB Accuracy, High Resolution
■ Serial Microwire-like interface
■ Single supply operation: 2.7V-5.5V
■ Setting read-back without effecting outputs
DESCRIPTION
values without effecting the stored settings and stored
settings can be read back without disturbing the
DPP’s output.
The CAT523 is a dual, 8-bit digitally-programmable
potentiometer (DPP™) configured for programmable
voltage and DAC-like applications. Intended for final
calibration of products such as camcorders, fax
machines and cellular telephones on automated high
volume productionlines, 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.
Control of the CAT523 is accomplished with a simple 3
wire, Microwire-like 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 an internal low voltage detector signals
properoperationofnon-volatileNVRAMmemoryErase/
Write cycle.
The two 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 NVRAM
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
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
DD
REFH
SOIC Package (J)
DIP Package (P)
14
3
1
7
PROGRAM
CONTROL
V
DD
V
PROG
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
REFH
REFH
CLK
RDY/BSY
CS
CLK
OUT1
OUT1
V
V
RDY/BSY
CS
OUT2
NC
OUT2
NC
CAT
523
CAT
523
5
2
DI
13
12
+
+
WIPER
CONTROL
REGISTER
AND
DI
V
DI
NC
V
NC
V
OUT1
28KΩ
SERIAL
CONTROL
DO
DO
REFL
REFL
CLK
NVRAM
PROG
GND
PROG
GND
8
7
8
7
4
CS
V
28KΩ
OU
SERIAL
DATA
6
DO
OUTPUT
REGISTER
CAT523
8
9
GND
V
REFL
© 2001 by Catalyst Semiconductor, Inc.
Doc. No. 2005, Rev. A
1
Characteristics subject to change without notice