X9259 Datasheet, PDF (4/25 Pages) Xicor Inc. – Quad Digitally-Controlled (XDCP) Potentiometers

X9259
PIN DESCRIPTIONS
Bus Interface Pins
SERIAL DATA INPUT/OUTPUT (SDA)
The SDA is a bidirectional serial data input/output pin
for a 2-Wire slave device and is used to transfer data
into and out of the device. It receives device address,
opcode, wiper register address and data sent from an
2-Wire master at the rising edge of the serial clock
SCL, and it shifts out data after each falling edge of the
serial clock SCL.
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.
SERIAL CLOCK (SCL)
This input is used by 2-Wire master to supply 2-Wire
serial clock to the X9259.
DEVICE ADDRESS (A3–A0)
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 X9259. A maximum of 16 devices may occupy the
2-Wire serial bus. Device pins A3-A0 must be tie to a
logic level which specify the external address of the
device, see figures 3, 4, and 5.
Potentiometer Pins
R_H, R_L
The R_H and R_L pins are equivalent to the terminal
connections on a mechanical potentiometer. Since
there are 4 potentiometers, there are 4 sets of R_H and
R_L such that R_H0 and R_L0 are the terminals of POT 0
and so on.
R_W
The wiper pin are equivalent to the wiper terminal of a
mechanical potentiometer. Since there are 4
potentiometers, there are 4 sets of R_W such that R_W0
is the terminal of POT 0 and so on.
Bias Supply Pins
SYSTEM SUPPLY VOLTAGE (V_CC) AND SUPPLY GROUND (V_SS)
The V_CC pin is the system supply voltage. The V_SS pin
is the system ground.
Other Pins
NO CONNECT
No connect pins should be left open. This pins are used
for Xicor manufacturing and testing purposes.
HARDWARE WRITE PROTECT INPUT (WP)
The WP pin when LOW prevents nonvolatile writes to
the Data Registers.
REV 1.2.3 4/30/02
www.xicor.com
Characteristics subject to change without notice. 4 of 25