CAT524_07 Datasheet, PDF (1/15 Pages) Catalyst Semiconductor – Quad Digitally Programmable Potentiometer (DPP™) with 256 Taps and Microwire Interface

CAT524
Quad Digitally Programmable Potentiometer (DPP™) with
256 Taps and Microwire Interface
FEATURES
„ Four 8-bit DPPs configured as programmable
voltage sources in DAC-like applications
„ Common reference inputs
„ Buffered wiper outputs
„ Non-volatile NVRAM memory wiper storage
„ Output voltage range includes both supply rails
„ 4 independently addressable buffered
output wipers
„ 1 LSB accuracy, high resolution
„ Serial Microwire-like interface
„ Single supply operation: 2.7V - 5.5V
„ Setting read-back without effecting outputs
For Ordering Information details, see page 17.
APPLICATIONS
„ Automated product calibration.
„ Remote control adjustment of equipment
„ Offset, gain and zero adjustments in self-
calibrating and adaptive control systems.
„ Tamper-proof calibrations.
„ DAC (with memory) substitute
PIN CONFIGURATION
PDIP 14-Lead (L)
SOIC 14-Lead (W)
V_DD 1
14 V_REFH
CLK 2
13 V_OUT1
RDY/¯B¯S¯Y¯ 3
12 V_OUT2
CS 4 ^CAT524 11 V_OUT3
DI 5
10 V_OUT4
DO 6
8 V_REFL
PROG 7
8 GND
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 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/¯B¯S¯Y¯ 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 0ºC to 70ºC
commercial and -40ºC to 85ºC industrial operating
temperature ranges. Both 14-pin plastic DIP and
SOIC packages are offered.
© Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. MD-2006 Rev. G