X9241A Datasheet, PDF (2/18 Pages) Xicor Inc. – Quad Digitally Controlled Potentiometer (XDCP)

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.
PIN CONFIGURATION
DIP/SOIC/TSSOP
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
1
20
2
19
3
18
4
17
5
16
X9241A
6
15
7
14
8
13
9
12
10
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