X9428_06 Datasheet, PDF (4/21 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer

X9428
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9428.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into
and out of the device. It is an open drain output and
may be wire-ORed with any number of open drain or
open collector outputs. An open drain output requires
the use of a pull-up resistor. For selecting typical
values, refer to the guidelines for calculating typical
values on the bus pull-up resistors graph.
Device Address (A₀, A₂, A₃)
The Address inputs are used to set the least
significant 3 bits of the 8-bit slave address. A match in
the slave address serial data stream must be made
with the Address input in order to initiate
communication with the X9428. A maximum of 8
devices may occupy the 2-wire serial bus.
Potentiometer Pins
R_H/V_H, R_L/V_L
The R_H/V_H and R_L/V_L inputs are equivalent to the
terminal connections on either end of a mechanical
potentiometer.
R_W/V_W
The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.
Hardware Write Protect Input WP
The WP pin when low prevents nonvolatile writes to
the Data Registers.
Analog Supply V+, V-
The Analog Supply V+, V- are the supply voltages for
the XDCP analog section.
PIN CONFIGURATION
V_CC
A2
R_L/V_L
R_H/V_H
R_W/V_W
SDA
WP
V_SS
DIP/SOIC
1
16
V+
2
15
NC
3
14
A0
4 _X9428 13
NC
5
12
A3
6
11
SCL
7
10
NC
8
9
V-
A2
R_L
R_H
R_W
SDA
WP
V_SS
TSSOP
1
14
2
13
3
12
4 X9428 11
5
10
6
9
7
8
V_CC
V+
A0
NC
A3
SCL
V-
PIN NAMES
Symbol
SCL
SDA
A0, A2, A3
R_H/V_H, V_L/R_H
R_W/V_W
WP
V+,V-
V_CC
V_SS
NC
Description
Serial clock
Serial data
Device address
Potentiometer Pins
(terminal equivalent)
Potentiometer Pin (wiper equivalent)
Hardware write protection
Analog and voltage follower
System supply voltage
System ground
No connection
4
FN8197.1
April 26, 2006