DP7221 Datasheet, PDF (1/16 Pages) Copal Electronics – Dual Digital Potentiometer

Dual Digital Potentiometer (DP) with
64 Taps and 2-wire Interface
DP7221
FEATURES
Two linear-taper digital potentiometers
64 resistor taps per potentiometer
End to end resistance 2.5kŸ, 10kŸ, 50kŸ or
100kŸ
Potentiometer control and memory access via
2-wire interface (I²C like)
Low wiper resistance, typically 80Ÿ
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 DP7221 is two Digital Potentiometers
(DPs) integrated with control logic and 16 bytes
of NVRAM memory. Each DP 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 DP. 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 2-wire
serial bus (I²C-like). 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 DP7221 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 _DP 16 A1
R_W1 6 ⁷²²¹ 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
2-WIRE
INTERFACE
WIPER
CONTROL
REGISTERS
CONTROL
LOGIC
NONVOLATILE
DATA
REGISTERS
R_L0 R_L1
R_W0
R_W1
© NIDEC COPAL ELECTRONICS CORP.
1
Characteristics subject to change without notice
Doc. No. MD-2113 Rev. K