CAT522_04 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer

CAT522
Configured Digitally Programmable Potentiometer (DPP™):
Programmable Voltage Applications
FEATURES
APPLICATIONS
ALOGEN ^FR
LEA _{D F REETM}
s Two 8-bit DPPs configured as programmable
voltage sources in DAC-like applications
s Independent reference inputs
s Non-volatile NVRAM memory wiper storage
s Output voltage range includes both supply rails
s 2 independently addressable buffered
output wipers
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
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 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.
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.
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-Stated 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 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.
FUNCTIONAL DIAGRAM
RDY/BSY
3
VDD
1
7
PROG
PROGRAM
CONTROL
VREFH1 VREFH2
14 13
5
DI
2
CLK
4
CS
SERIAL
CONTROL
WIPER
CONTROL
REGISTERS
AND
NVRAM
+
24KΩ
+
24kΩ
CAT522
8
GND
SERIAL
DATA
OUTPUT
REGISTER
9 10
VREFL1 VREFL2
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
VOUT2
12
VOUT1
6
DO
PIN CONFIGURATION
DIP Package (P, L)
SOIC Package (J, W)
VDD
CLK
RDY/BSY
CS
DI
DO
PROG
1
14
2
13
3
12
4
11
CAT522
5
10
6
9
7
8
VREFH1
VDD
VREFH2
CLK
VOUT1 _RDY/BSY
VOUT2
CS
VREFL2
DI
VREFL1
DO
GND
PROG
1
14
2
13
3
12
4
11
CAT522
5
10
6
9
7
8
VREFH1
VREFH2
VOUT1
VOUT2
VREFL2
VREFL1
GND
Doc. No. 2004, Rev. E
1