X9258 datasheet(2/22 Pages) XICOR

2 / 22 page

X9258

Characteristics subject to change without notice.

2 of 22

REV 1.1.7 2/4/03

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PIN DESCRIPTIONS

Host Interface Pins

SERIAL CLOCK (SCL)

The SCL input is used to clock data into and out of the

X9258.

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 (A0–A3)

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

order

initiate

communication with the X9258. A maximum of 16

devices may occupy the 2-wire serial bus.

Potentiometer Pins

VH/RH (VH0/RH0–VH3/RH3), VL/RL (VL0/RL0–VL3/RL3)

The VH/RH and VL/RL inputs are equivalent to the

terminal connections on either end of a mechanical

potentiometer.

VW/RW (VW0/RW0–VW3/RW3)

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.

Analog Supplies V+, V-

The Analog Supplies V+, V- are the supply voltages

for the DCP analog section.

PIN CONFIGURATION

VW3/RW3

V+

VCC

VL0/RL0

SCL

VL2/RL2

VH2/RH2

VW2/RW2

V–

VSS

VW1/RW1

VH1/RH1

VL1/RL1

SOIC/TSSOP

X9258

VH3/RH3

VL3/RL3

VH0/RH0

VW0/RW0

SDA

Top View–Bumps Down

RW0

RL0

V+

RL1

VCC

RL3

RW3

SDA

RW1

SCL

RL2

V-

RH0

RH1

RH3

VSS

RW2

CSP

RH2

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