X9429_08 Datasheet, PDF (4/20 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer(XDCP™)

Pinouts
NC
NC
NC
A2
SCL
SDA
VSS
X9429
(14 LD TSSOP)
TOP VIEW
1
14
2
13
3
12
4 _X9429 11
5
10
6
9
7
8
V_CC
R_L/V_L
R_H/V_H
R_W/V_W
A3
A0
WP
X9429
NC
NC
NC
A2
SCL
SDA
NC
VSS
X9429
(16 LD SOIC)
TOP VIEW
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
12, 3, 7, 15
4
5
6
8
9
10
11
12
13
14
16
SYMBOL
NC
A2
SCL
SDA
V_SS
WP
A0
A3
R_W/V_W
R_H/V_H
R_L/V_L
V_CC
BRIEF DESCRIPTION
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
Pin Descriptions
Host Interface Pins
SERIAL CLOCK (SCL)
The SCL input is used to clock data into and out of the
X9429.
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 X9429. 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.
Principals of Operation
The X9429 is a highly integrated microcircuit incorporating a
resistor array and its associated registers and counters and
the serial interface logic providing direct communication
between the host and the XDCP potentiometers.
Serial Interface
The X9429 supports a bidirectional bus oriented protocol.
The protocol defines any device that sends data onto the
4
FN8248.3
October 13, 2008