x9428wsi-2.7 Intersil Corporation, x9428wsi-2.7 Datasheet - Page 4

• Manufacturer Part Number: x9428wsi-2.7
• Description: Single Digitally Controlled Potentiometer Xdcp?
• Manufacturer: Intersil Corporation

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
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.
H
W
/V
/V
H
W
the
, R
H
/V
L
H
/V
Address
L
and R
L
0
/V
, A
L
input
2
inputs are equivalent to the
, A
4
3
)
in
order
to
initiate
X9428
PIN CONFIGURATION
PIN NAMES
R
H
A0, A2, A3
Symbol
/V
R
V+,V-
SDA
SCL
W
V
V
H
WP
NC
CC
SS
, V
/V
W
R
L
R
/R
R
W
H
SDA
V
L
/V
V
SDA
WP
/V
H
/V
V
CC
A2
WP
R
SS
R
A2
R
W
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
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
April 26, 2006
FN8197.1