CAT5132 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – 15 Volt Digitally Programmable Potentiometer (DPP) with 128 Taps and 2-wire Interface

CAT5132
15 Volt Digitally Programmable Potentiometer (DPP™)
with 128 Taps and 2-wire Interface
FEATURES
DESCRIPTION
s Single linear Digitally Programmable Potentiometer The CAT5132 is a high voltage Digitally Programmable
s 128 Resistor taps
s End-to-end resistance of 10kΩ, 50kΩ & 100kΩ
Potentiometer (DPP) integrated with EEPROM memory
and control logic to operate in a similar manner as a
mechanical potentiometer. The DPP consists of a series
s Potentiometer control and memory access via
of resistive elements connected between two externally
2-wire interface (I²C-like)
accessible end points. The tap points between each
s Nonvolatile memory storage for wiper settings
resistive element are connected to the wiper output with
CMOS switches. A separate 7-bit control register (WCR)
s Automatic recall of saved wiper setting at power up _{independently controls the wiper tap switches for the}
s Special increment/decrement instruction mode for ^{DPP. Associated with the control register is a 7-bit}
automatic trimming adjustments
s V_CC operation from 2.7 V to 5.5 V
nonvolatile memory data register (DR) used for storing
wiper settings. Writing to the wiper control register or the
nonvolatile data register is via a 2-wire serial bus (I²C-
s V+ (Analog Voltage Supply) operation from +8 V to _like).
+15V
s Standby current less than 15 µA
On power-up, WCR is set to mid scale (1000000) and
after the Power Supply becomes stable, the contents of
s 100 year nonvolatile memory data retention
the data register (DR) are transferred to the wiper control
s 10-pin MSOP package
s Operating temperature of -40˚C to + 85˚C
register (WCR) and the wiper is positioned to that
location.
APPLICATIONS
s LCD screen adjustment
The CAT5132 comes with 2 voltage supply inputs: V_CC,
the digital supply voltage input and V+, an analog supply
voltage input. These inputs allow the V+ to be as much
as 10 volts higher than the V_CC and allow the DPP
terminal values to be as much as 15 volts above ground.
s Volume control
s Mechanical potentiometer replacement
s Gain adjustment
s Line impedance matching
s VCOM setting adjustments
The CAT5132 can be used as a potentiometer or as a
two-terminal variable resistor. It is intended for circuit
level adjustments. It is supplied standard in the -40°C to
+85°C industrial operating temperature range and offered
in the 10-pin MSOP package.
BLOCK DIAGRAM
SDA
SCL
A0
A1
VCC
CONTROL LOGIC AND
ADDRESS DECODE
7-BIT
NONVOLATILE
MEMORY
REGISTER
(DR)
7-BIT WIPER
CONTROL
REGISTER
(WCR)
V+
127
128 TAP POSITION
DECODE CONTROL
0
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
RH
RL
RW
Doc. No. 25092, Rev. 00