E
CAT5259
Quad Digitally Programmable Potentiometers (DPP™)
with 256 Taps and 2-wire Interface
TM
FEATURES
■ Four linear taper digitally programmable
■ Automatic recall of saved wiper settings at
potentiometers
power up
■ 256 resistor taps per potentiometer
■ End to end resistance 50kΩ or 100kΩ
■ 2.5 to 6.0 volt operation
■ Standby current less than 1 µA
■ 1,000,000 nonvolatile WRITE cycles
■ 100 year nonvolatile memory data retention
■ 24-lead SOIC and 24-lead TSSOP packages
■ Industrial temperature range
■ Potentiometer control and memory access via
2-wire interface (I2C like)
■ Low wiper resistance, typically 100Ω
■ Nonvolatile memory storage for up to four
wiper settings for each potentiometer
DESCRIPTION
The CAT5259 is four digitally programmable
potentiometers (DPPs™) integrated with control logic
and 16 bytes of NVRAM memory. Each DPP consists of
a series of resistive elements connected between two
externallyaccessibleendpoints.Thetappointsbetween
eachresistiveelementareconnectedtothewiperoutputs
with CMOS switches. A separate 8-bit control register
(WCR)independentlycontrolsthewipertapswitchesfor
each DPP. Associated with each wiper control register
are four 8-bit non-volatile memory data registers (DR)
used for storing up to four wiper settings. Writing to the
wiper control register or any of the non-volatile data
registers is via a 2-wire serial bus. On power-up, the
contents of the first data register (DR0) for each of the
four potentiometers is automatically loaded into its
respective wiper control registers.
The CAT5259 can be used as a potentiometer or as a
two terminal, variable resistor. It is intended for circuit
level or system level adjustments in a wide variety of
applications.Itisavailableinthe0˚Cto70˚Ccommercial
and -40˚C to 85˚C industrial operating temperature
ranges and offered in a 24-lead SOIC and TSSOP
package.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
SOIC/TSSOP Package (J, W/U, Y)
R
R
H3
R
H1
R
H2
H0
24
23
22
21
20
19
18
17
16
15
14
13
1
NC
A0
A3
2
SCL
RL2
RH2
R
R
R
W0
W1
W2
W3
3
R
WIPER
CONTROL
REGISTERS
SCL
SDA
W3
H3
L3
2-WIRE BUS
INTERFACE
4
R
R
5
R
W2
WP
6
NC
NC
CAT
5259
7
V
GND
CC
A0
A1
A2
A3
NONVOLATILE
DATA
REGISTERS
8
CONTROL
LOGIC
R
R
W1
L0
9
R
R
R
R
H0
H1
10
11
12
R
L1
W0
A2
A1
R
R
L3
R
R
L2
L1
L0
WP
SDA
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Document No. 2000, Rev. F
1