DP7409 Datasheet, PDF (1/16 Pages) Copal Electronics – Quad Digital Potentiometers

Quad Digital Potentiometers
(DP) with 64 Taps and 2-wire Interface
DP7409
FEATURES
Four linear taper digital potentiometers
64 resistor taps per potentiometer
End to end resistance 2.5kŸ, 10kŸ, 50kŸ or
100kŸ
2-wire interface (I²C like)
Low wiper resistance, typically 80Ÿ
Four non-volatile wiper settings for each
potentiometer
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
Write protection for data register
For Ordering Information details, see page 15.
PIN CONFIGURATION
TSSOP (Y)
SOIC (W)
SDA 1
A₁ 2
R_L1 3
R_H1 4
R_W1 5
GND 6
NC 7
R_W2 8
R_H2 9
R_L2 10
SCL 11
A₃ 12
24 WP
23 A₂
22 R_W0
21 R_H0
20 R_L0
19 V_CC
18 NC
17 R_L3
16 R_H3
15 R_W3
14 A₀
13 NC
V_{CC 1}
R_L0 2
R_H0 3
R_W0 4
A₂ 5
WP 6
SDA 7
A₁ 8
R_L1 9
R_H1 10
R_W1 11
GND 12
24 NC
23 R_L3
22 R_H3
21 R_W3
20 A₀
19 NC
18 A₃
17 SCL
16 R_L2
15 R_H2
14 R_W2
13 NC
DESCRIPTION
The DP7409 is four Digital Potentiometers
(DP) integrated with control logic and 16 bytes
of NVRAM memory.
A separate 6-bit control register (WCR) independently
controls the wiper tap position 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 Write Protection (¯W¯P¯) pin protects against
inadvertent programming of the data register.
The DP7409 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.
FUNCTIONAL DIAGRAM
SCL
SDA
WP
A₀
A₁
A₂
A₃
R_H0
R_H1
R_H2
R_H3
2-WIRE BUS
WIPER CONTROL
INTERFACE
REGISTERS
R_W0
R_W1
NONVOLATILE
R_W2
CONTROL LOGIC
DATA
REGISTERS
R_W3
R_L0
R_L1
R_L2
R_L3
© NIDEC COPAL ELECTRONICS CORP.
1
Characteristics subject to change without notice
Doc. No. MD-2010 Rev. K