X9428 Xicor, X9428 Datasheet - Page 2

• Manufacturer Part Number: X9428
• Description: Single Digitally Controlled Potentiometer
• Manufacturer: Xicor

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 (A
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
The R
terminal connections on either end of a mechanical
potentiometer.
R
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.
REV 1.1.5 7/8/03
H
W
/V
/V
H
W
, R
H
/V
L
H
/V
L
and R
L
0
/V
, A
L
2
, A
inputs are equivalent to the
3
)
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PIN CONFIGURATION
PIN NAMES
R
A0, A2, A3
H
Symbol
/V
R
V+,V-
SDA
SCL
V
W
V
H
WP
NC
CC
, V
SS
/V
W
L
R
R
/R
R
W
H
SDA
V
L
/V
V
SDA
/V
WP
H
/V
V
CC
A2
WP
R
SS
R
A2
W
R
SS
H
L
W
H
L
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
Characteristics subject to change without notice.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
DIP/SOIC
TSSOP
X9428
X9428
Description
16
15
14
13
12
11
10
9
14
13
12
11
10
9
8
V
V+
A0
NC
A3
SCL
V–
V+
NC
A0
NC
A3
SCL
NC
V–
CC
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