CAT5221 Datasheet, PDF (1/16 Pages) Catalyst Semiconductor – Dual Digitally Programmable Potentiometers (DPP) with 64 Taps and 2-wire Interface

CAT5221
Dual Digitally Programmable Potentiometer (DPP™) with
64 Taps and I²C Interface
FEATURES
„ Two linear-taper digitally programmable
potentiometers
„ 64 resistor taps per potentiometer
„ End to end resistance 2.5 kΩ, 10 kΩ, 50 kΩ or
100 kΩ
„ Potentiometer control and memory access via
I²C interface
„ Low wiper resistance, typically 80 Ω
„ Nonvolatile memory storage for up to four
wiper settings for each potentiometer
„ Automatic recall of saved wiper settings at
power up
„ 2.5 to 6.0 volt operation
„ Standby current less than 1µA
„ 1,000,000 nonvolatile WRITE cycles
„ 100 year nonvolatile memory data retention
„ 20-lead SOIC and TSSOP packages
„ Industrial temperature range
For Ordering Information details, see page 15.
DESCRIPTION
The CAT5221 is two Digitally Programmable
Potentiometers (DPPs™) integrated with control logic
and 16 bytes of NVRAM memory. Each DPP consists
of a series of 63 resistive elements connected
between two externally accessible end points. The tap
points between each resistive element are connected
to the wiper outputs with CMOS switches. A separate
6-bit control register (WCR) independently controls
the wiper tap switches for each DPP. Associated with
each wiper control register are four 6-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 I²C 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
register (WCR).
The CAT5221 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.
PIN CONFIGURATION
SOIC 20 Lead (W)
TSSOP 20 Lead (Y)
R_W0 1
20 V_CC
R_L0 2
19 NC
R_H0 3
18 NC
A0 4
17 NC
A2 5 _CAT 16 A1
R_W1 6 ⁵²²¹ 15 A3
R_L1 7
14 SCL
RH1 8
13 NC
SDA 9
12 NC
GND 10
11 NC
FUNCTIONAL DIAGRAM
R_H0 R_H1
SCL
SDA
A0
A1
A2
A3
I²C
INTERFACE
WIPER
CONTROL
REGISTERS
R_W0
CONTROL
LOGIC
NONVOLATILE
DATA
REGISTERS
R_W1
R_L0 R_L1
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-2113 Rev. M