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X9428 Datasheet, PDF (2/20 Pages) Xicor Inc. – Single Digitally Controlled Potentiometer | |||
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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
RH/VH, RL/VL
The RH/VH and RL/VL inputs are equivalent to the
terminal connections on either end of a mechanical
potentiometer.
RW/VW
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
VCC
A2
RL/VL
RH/VH
RW/VW
SDA
WP
VSS
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
RL
RH
RW
SDA
WP
VSS
TSSOP
1
14
2
13
3
12
4 X9428 11
5
10
6
9
7
8
VCC
V+
A0
NC
A3
SCL
V-
PIN NAMES
Symbol
Description
SCL
Serial clock
SDA
Serial data
A0, A2, A3 Device address
RH/VH, VL/RH Potentiometer Pins
(terminal equivalent)
RW/VW
WP
Potentiometer Pin (wiper equivalent)
Hardware write protection
V+,V-
Analog and voltage follower
VCC
VSS
NC
System supply voltage
System ground
No connection
2
FN8197.0
March 8, 2005
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