X9429 INTERSIL [Intersil Corporation], X9429 Datasheet - Page 4

• Manufacturer Part Number: X9429
• Manufacturer: INTERSIL [Intersil Corporation]

Pinouts
Pin Assignments
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 (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 X9429. A maximum
of 8 devices may occupy the 2-wire serial bus.
TSSOP PIN
1, 2, 3
10
11
12
13
14
4
5
6
7
8
9
SDA
SCL
VSS
NC
NC
NC
A2
12, 3, 7, 15
SOIC PIN
(14 LD TSSOP)
0
1
2
3
4
5
6
7
10
11
12
13
14
16
, A
4
5
6
8
9
TOP VIEW
2
X9429
X9429
, A
4
3
)
14
13
12
11
10
9
8
SYMBOL
R
R
R
SDA
SCL
V
W
V
WP
NC
H
A2
A0
A3
L
SS
CC
/V
/V
/V
W
H
L
V
R
R
R
A3
A0
WP
CC
L
H
W
/V
/V
/V
L
H
W
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
X9429
Potentiometer Pins
R
The R
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.
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
H
W
/V
/V
H
W
H
, R
/V
L
H
BRIEF DESCRIPTION
/V
and R
L
SDA
SCL
VSS
NC
NC
NC
NC
A2
L
/V
L
inputs are equivalent to the terminal
(16 LD SOIC)
1
2
3
4
5
6
7
8
TOP VIEW
X9429
X9429
16
15
14
13
12
11
10
9
V
NC
R
R
R
A3
A0
WP
CC
L
H
W
/V
/V
/V
L
H
W
October 13, 2008
FN8248.3