CAT523_04 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer

CAT523
ALOGEN ^FR
Configured Digitally Programmable Potentiometer (DPP™):
Programmable Voltage Applications
FEATURES
APPLICATIONS
LEA _{D F REETM}
s Two 8-bit DPPs configured as programmable
voltage sources in DAC-like applications
s Common reference inputs
s Non-volatile NVRAM memory wiper storage
s Automated product calibration.
s Remote control adjustment of equipment
s Offset, gain and zero adjustments in self-
calibrating and adaptive control systems.
s Output voltage range includes both supply rails
s Tamper-proof calibrations.
s 2 independently addressable buffered
output wipers
s DAC (with memory) substitute
s 1 LSB accuracy, high resolution
s Serial microwire-like interface
s Single supply operation: 2.7V - 5.5V
s Setting read-back without effecting outputs
DESCRIPTION
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 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 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
values without effecting the stored settings and stored
settings can be read back without disturbing the
DPP’s output.
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
proper operation of non-volatile NVRAM memory Erase/
Write cycle.
The CAT523 is available in the 0°C 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
RDY/BSY
VDD
V_REFH
3
1
14
PIN CONFIGURATION
DIP Package (P, L)
SOIC Package (J, W)
7
PROG
PROGRAM
CONTROL
5
DI
2
CLK
4
CS
SERIAL
CONTROL
WIPER
CONTROL
REGISTER
AND
NVRAM
+
13
VOUT1
+
12
VOUT2
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
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
VREFL
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
6
DO
1
Doc. No. 2005, Rev. E