E
CAT522
Configured Digitally Programmable Potentiometer (DPP™):
Programmable Voltage Applications
TM
FEATURES
APPLICATIONS
■ Two 8-bit DPPs configured as programmable
■ Automated product calibration.
voltage sources in DAC-like applications
■ Remote control adjustment of equipment
■ Independent 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
dithered to test new output values without effecting the
stored settings and stored settings can be read back
without disturbing the DPP's output.
The CAT522 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
self-calibrating systems and for applications where
equipment which requires periodic adjustment is either
difficult to access or in a hazardous environment.
TheCAT522iscontrolledwithasimple3-wire,microwire-
like 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 CAT522 Tri-Stated Data
Output pin. A RDY/BSY output working in concert with
aninternallowvoltagedetectorsignalsproperoperation
of the non-volatile NVRAM memory Erase/Write cycle.
The CAT522 offers two independently programmable
DPPs each having its own reference inputs and each
capable of rail to rail output swing. The wipers are
buffered by rail to rail opamps. 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
The CAT522 is available in the 0°C to 70°C commercial
and -40°C to 85°C industrial operating temperature
ranges. Both 14-pin plastic DIP and surface mount
packages are available.
PIN CONFIGURATION
FUNCTIONAL DIAGRAM
V
V
V
REFH2
REFH1
RDY/BSY
DD
DIP Package (P, L)
SOIC Package (J, W)
14
13
3
1
7
PROGRAM
CONTROL
PROG
1
2
3
4
5
14
13
12
11
10
9
V
V
V
V
V
V
V
1
2
3
4
5
14
13
12
11
10
9
V
V
V
V
V
V
V
DD
REFH1
REFH2
OUT1
DD
REFH1
REFH2
OUT1
CLK
RDY/BSY
CS
CLK
RDY/BSY
CS
5
2
DI
11
12
+
+
V
WIPER
CONTROL
REGISTERS
AND
24KΩ
OUT2
SERIAL
CONTROL
CLK
NVRAM
OUT2
OUT2
4
CAT522
CAT522
CS
V
24kΩ
OU
DI
DI
REFL2
REFL1
REFL2
REFL1
DO
6
7
DO
6
7
SERIAL
6
8
DATA
PROG
GND
8
PROG
GND
DO
OUTPUT
REGISTER
CAT522
8
9
10
V
V
REFL2
GND
REFL1
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 2004, Rev. E
1