CAT524 Datasheet, PDF (1/12 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications

CAT524
Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications
FEATURES
s Four 8-bit DPPs configured as programmable
voltage sources in DAC-like applications
s Common reference inputs
s Buffered wiper outputs
s Non-volatile NVRAM memory wiper storage
s Output voltage range includes both supply rails
s 4 independently addressable buffered
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
DESCRIPTION
The CAT524 is a quad, 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 production lines, it is also well suited for
self-calibrating systems and for applications where
equipment which requires periodic adjustment is either
difficult to access or in a hazardous environment.
The four independently programmable DPPs have an
output 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 automati-
cally reinstated when power is returned. Each wiper can
be dithered to test new output values without effecting
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
the stored settings, and stored settings can be read back
without disturbing the DPP’s output.
The CAT524 is controlled with a simple 3 wire serial
interface. A Chip Select pin allows several devices to
share a common serial interface. Communication back
to the host controller is via a single serial data line thanks
to the Tri-Stated CAT524 Data Output pin. A RDY/BSY
output working in concert with an internal low voltage
detector signals proper operation of the non-volatile
NVRAM memory Erase/Write cycle.
The CAT524 is available in the 0 to 70° C commercial
and –40° C to 85° C industrial operating temperature
ranges. Both 14-pin plastic DIP and SOIC packages are
offered.
FUNCTIONAL DIAGRAM
RDY/BSY
3
VDD
1
VREF H
14
7
PROG
PROGRAM
CONTROL
5
DI
2
CLK
4
CS
SERIAL
CONTROL
NVRAM
+
–
13
VOUT1
+
12
–
VOUT2
+
11
–
VOUT3
+
10
–
VOUT4
PIN CONFIGURATION
DIP Package (P)
SOIC Package (J)
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
1 14
2 13
3 12
4 ^CAT 11
524
5 10
6
9
7
8
VREFH
VOUT1
VOUT2
VOUT3
VOUT4
VREF L
GND
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
1 14
2 13
3 12
4 ^CAT 11
5 ⁵²⁴ 10
6
9
7
8
VREFH
VOUT1
VOUT2
VOUT3
VOUT4
VREFL
GND
CAT524
8
GND
SERIAL
DATA
OUTPUT
REGISTER
9
VREFL
6
DO
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25076-00 4/01 M-1