X9429 Datasheet, PDF (4/21 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer

PIN CONFIGURATION
NC
NC
NC
A2
SCL
SDA
VSS
TSSOP
1
14
2
13
3
12
4 ^X9429 11
5
10
6
9
7
8
X9429
V_CC
R_L/V_L
R_H/V_H
R_W/V_W
A3
A0
WP
NC
NC
NC
A2
SCL
SDA
NC
VSS
SOIC
1
16
2
15
3
14
4 _X9429 13
5
12
6
11
7
10
8
9
V_CC
NC
R_L/V_L
R_H/V_H
R_W/V_W
A3
A0
WP
PIN ASSIGNMENTS
TSSOP pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SOIC pin
1
2
3
4
5
6
8
9
10
11
12
13
14
16
15
7
Symbol
NC
NC
NC
A2
SCL
SDA
V_SS
WP
A0
A3
R_W / V_W
R_H / V_H
R_L / V_L
V_CC
NC
NC
Brief Description
No Connect
No Connect
No Connect
Device Address for 2-wire bus.
Serial Clock for 2-wire bus.
Serial Data Input/Output for 2-wire bus.
System Ground
Hardware Write Protect
Device Address for 2-wire bus.
Device Address for 2-wire bus.
Wiper Terminal of the Potentiometer.
High Terminal of the Potentiometer.
Low Terminal of the Potentiometer.
System Supply Voltage
No Connect
No Connect
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9429.
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 X9429. A maximum of 8
devices may occupy the 2-wire serial bus.
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.
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.
4
FN8248.2
October 19, 2005