CAT523 Datasheet, PDF (1/10 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer (DPP): Programmable Voltage Applications

Advance Information
CAT523
Configured Digitally Programmable Potentiometer (DPP): Programmable Voltage Applications
FEATURES
s Two 8-bit DPPS Configured as Programmable
Voltages in DAC-like Applications
s Buffered Wiper Outputs
s Nonvolatile Wiper Storage
s Output voltage range includes both supply rails
s 2 independently addressable output wipers
s 1 LSB Accuracy, High Resolution
s Serial µP interface
s Single supply operation: 2.7V-5.5V
s Setting read-back without effecting outputs
APPLICATIONS
s Automated product calibration.
s Remote control adjustment of equipment
s Offset, gain and zero adjustments in Self-
Calibrating and Adaptive Control systems.
s Tamper-proof calibrations.
s DAC (with memory) substitute
DESCRIPTION
The CAT523 is a dual, 8-bit digitally-programmable
potentiometer 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 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.
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
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
an internal low voltage detector signals proper operation
of non-volatile Erase/Write cycle.
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.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
7
PROG
RDY/BSY
3
PROGRAM
CONTROL
5
DI
2
CLK
4
CS
SERIAL
CONTROL
VDD
1
DATA
REGISTER
AND
NONVOLATILE
MEMORY
V_REFH
14
+
7KΩ
+
7KΩ
13
VOUT1
12
VOUT2
DIP Package (P)
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
1 14
2 13
3 12
4 ^CAT 11
523
5 10
6
9
7
8
VREFH
VOUT1
VOUT2
NC
NC
VREFL
GND
SOIC Package (J)
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
1 14
2 13
3 12
4 ^CAT 11
5 ⁵²³ 10
6
9
7
8
VREFH
VOUT1
VOUT2
NC
NC
VREFL
GND
CAT523
8
GND
SERIAL
DATA
OUTPUT
REGISTER
9
VREF L
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
6
DO
1
Doc. No. 25076-00 2/98 M-1