CAT524_04 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer

CAT524
ALOGEN ^FR
Configured Digitally Programmable Potentiometer (DPP™):
Programmable Voltage Applications
LEA _{D F REETM}
FEATURES
s Four 8-bit DPPs configured as programmable
voltage sources in DAC-like applications
s Single supply operation: 2.7V - 5.5V
s Setting read-back without effecting outputs
s Common reference inputs
s Buffered wiper outputs
APPLICATIONS
s Non-volatile NVRAM memory wiper storage
s Automated product calibration
s Output voltage range includes both supply rails
s Remote control adjustment of equipment
s 4 independently addressable buffered
output wipers
s Offset, gain and zero adjustments in
self-calibrating and adaptive control systems
s 1 LSB accuracy, high resolution
s Tamper-proof calibrations
s Serial Microwire-like interface
s DAC (with memory) substitute
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
automatically reinstated when power is returned. Each
wiper can be dithered to test new output values without
FUNCTIONAL DIAGRAM
RDY/BSY
VDD
VREFH
3
1
14
7
PROG
PROGRAM
CONTROL
24kΩ(4)
+
–
13
VOUT1
5
DI
2
CLK
4
CS
SERIAL
CONTROL
WIPER
CONTROL
REGISTERS
AND
NVRAM
+
12
–
VOUT2
+
11
–
VOUT3
+
10
–
VOUT4
effecting 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,
Microwire-like 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˚C to 70˚C commercial
and -40˚C to 85˚C industrial operating temperature
ranges. Both 14-pin plastic DIP and SOIC packages are
offered.
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 ^CAT 11
524
5 10
6
9
7
8
VREFH
VOUT1
VOUT2
VOUT3
VOUT4
VREFL
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
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 2006, Rev. E