X9259 datasheet(4/25 Pages) XICOR

4 / 25 page

X9259

Characteristics subject to change without notice.

4 of 25

REV 1.2.3 4/30/02

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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

RH, RL

The RH and RL pins are equivalent to the terminal

connections on a mechanical potentiometer. Since

there are 4 potentiometers, there are 4 sets of RH and

RL such that RH0 and RL0 are the terminals of POT 0

and so on.

The wiper pin are equivalent to the wiper terminal of a

mechanical

potentiometer.

Since

there

are

potentiometers, there are 4 sets of RW such that RW0

is the terminal of POT 0 and so on.

Bias Supply Pins

SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY GROUND (VSS)

The VCC pin is the system supply voltage. The VSS 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.

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