DP7259
Quad Digital Potentiometers
(DP) with 256 Taps and 2-wire Interface
FEATURES
DESCRIPTION
Four linear taper digital potentiometers
The DP7259 is four digital potentiometers
(DPs) integrated with control logic and 16 bytes
of NVRAM memory. Each DP consists of a series
of 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 8-bit
control register (WCR) independently controls the
wiper tap switches for each DP. 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.
256 resistor taps per potentiometer
End to end resistance 50k or 100k
Potentiometer control and memory access via
2-wire interface (I2C like)
Low wiper resistance, typically 100
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
24-lead SOIC and 24-lead TSSOP packages
Industrial temperature range
The DP7259 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. It is available in the -40ºC to 85ºC
industrial operating temperature ranges and offered in
a 24-lead SOIC and TSSOP package.
For Ordering Information details, see page 15.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
SOIC (W)
TSSOP (Y)
R
H0
R
R
R
H3
H1
H2
NC
A0
1
2
3
4
5
6
7
8
9
24 A3
SCL
SDA
2-WIRE BUS
INTERFACE
WIPER CONTROL
REGISTERS
23 SCL
22 RL2
21 RH2
20 RW2
19 NC
18 GND
17 RW1
16 RH1
15 RL1
14 A1
R
R
R
R
W0
W1
W2
W3
RW3
RH3
RL3
NC
VCC
RLO
RHO
WP
A
A
A
A
0
1
2
3
NONVOLATILE
DATA
REGISTERS
CONTROL LOGIC
R
L0
R
R
R
L3
L1
L2
RWO 10
A2 11
¯¯¯
WP
12
13 SDA
© NIDEC COPAL ELECTRONICS CORP.
Characteristics subject to change without notice
1
Doc. No. MD-2000 Rev. H