CAT522
Configured Digitally Programmable Potentiometer (DPP™):
Programmable Voltage Applications
FEATURES
DESCRIPTION
Two 8-bit DPPs configured as programmable
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.
voltage sources in DAC-like applications
Independent reference inputs
Non-volatile NVRAM memory wiper storage
Output voltage range includes both supply rails
2 independently addressable buffered
output wipers
1 LSB accuracy, high resolution
Serial Microwire-like interface
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 dithered to test new output values without effecting
the stored settings and stored settings can be read
back without disturbing the DPP's output.
Single supply operation: 2.7V - 5.5V
Setting read-back without effecting outputs
For Ordering Information details, see page 14.
APPLICATIONS
Automated product calibration.
The CAT522 is controlled with a simple 3-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-
Remote control adjustment of equipment
Offset, gain and zero adjustments in self-
calibrating and adaptive control systems.
Tamper-proof calibrations.
¯¯¯¯
Stated Data Output pin. A RDY/BSY output working
DAC (with memory) substitute.
in concert with an internal low voltage detector signals
proper operation of the non-volatile NVRAM memory
Erase/Write cycle.
PIN CONFIGURATION
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.
PDIP 14-Lead (L)
SOIC 14-Lead (W)
VDD
1
2
3
4
5
6
7
14 VREFH1
13 VREFH1
12 VOUT1
11 VOUT2
10 VREFL2
CLK
¯¯¯¯
RDY/BSY
CAT522
CS
DI
DO
8
8
VREFL1
GND
PROG
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2004 Rev. G