X9241A
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9241A.
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.
Address
The Address inputs are used to set the least
significant 4 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 X9241A.
Potentiometer Pins
V
H
/R
H
(V
H0
/R
H0
—V
H3
/R
H3
), V
L
/R
L
(V
L0
/R
L0
—V
L3
/R
L3
)
The R
H
and R
L
inputs are equivalent to the terminal
connections on either end of a mechanical
potentiometer.
V
W
/R
W
(V
W0
/R
W0
—V
W3
/R
W3
)
The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.
V
W0
/R
W0
V
L0
/R
L0
V
H0
/R
H0
A0
A2
V
W1
/R
W1
V
L1
/R
L1
V
H1
/R
H1
SDA
V
SS
PIN CONFIGURATION
DIP/SOIC/TSSOP
1
2
3
4
5
6
7
8
9
10
X9241A
20
19
18
17
16
15
14
13
12
11
V
CC
V
W3
/R
W3
V
L3
/R
L3
V
H3
/R
H3
A1
A3
SCL
V
W2
/R
W2
V
L2
/R
L2
V
H2
/R
H2
PIN NAMES
Symbol
SCL
SDA
A0–A3
V
H0
/R
H0
–V
H3
/R
H3
,
V
L0
/R
L0
–V
L3
/R
L3
V
W0
/R
W0
–V
W3
/R
W3
Description
Serial Clock
Serial Data
Address
Potentiometer Pins
(terminal equivalent)
Potentiometer Pins
(wiper equivalent)
PRINCIPLES OF OPERATION
The X9241A is a highly integrated microcircuit
incorporating four resistor arrays, their associated
registers and counters and the serial interface logic
providing direct communication between the host and
the XDCP potentiometers.
REV 1.1.13 12/09/02
www.xicor.com
Characteristics subject to change without notice.
2 of 18
XICOR [ XICOR INC. ]
