X9430 datasheet(4/21 Pages) XICOR

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X9430

– Preliminary Information

Characteristics subject to change without notice.

4 of 21

REV 1.0 6/20/00

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Potentiometer/Array Description

The X9430 is comprised of two resistor arrays and two

operational amplifiers. Each array contains 63 discrete

resistive segments that are connected in series. The

physical ends of each array are equivalent to the fixed

terminals of a mechanical potentiometer (RH and RL).

At both ends of each array and between each resistor

segment is a CMOS switch connected to the wiper

(RW) output. Within each individual array only one

switch may be turned on at a time. These switches are

controlled by a volatile wiper counter register (WCR).

The six bits of the WCR are decoded to select, and

enable, one of sixty-four switches.

The WCR may be written directly, or it can be changed

by transferring the contents of one of four associated

data registers into the WCR. These data registers and

the WCR can be read and written by the host system.

Operational Amplifier

The voltage operational amplifiers are CMOS rail-to-rail

output general purpose amplifiers. They are designed

to operate from dual (±) power supplies. The amplifiers

may be configured like any standard amplifier. All pins

are externally available to allow connection with the

potentiometers or as stand alone amplifiers.

Detailed Block Diagram

VOUT (0,1)

(DR0-DR3)0,1

Control and

SCK

VH (0,1)

VL (0,1)

VW (0,1)

VN (0,1)

–

WCR0,1

(DR0-DR3)0,1

VINV (0,1)

VSS

VCC

HOLD

Memory

WCR0

WCR1

(One of 2 Circuits)

Write in Process

The contents of the data registers are saved to nonvol-

atile memory when the CS pin goes from LOW to

HIGH after a complete write sequence is received by

the device. The progress of this internal write opera-

tion can be monitored by a write in process bit (WIP).

The WIP bit is read with a read status command.

INSTRUCTIONS AND PROGRAMMING

Identification (ID) Byte

The first byte sent to the X9430 from the host, follow-

ing a CS going HIGH to LOW, is called the identifica-

tion byte. The most significant four bits of the slave

address are a device type identifier, for the X9430 this

is fixed as 0101[B] (refer to Figure 1).

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