X9269TS24I-2.7 datasheet(5/24 Pages) INTERSIL

Part #	X9269TS24I-2.7

Description	Single Supply/Low Power/256-Tap/2-Wire Bus

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Manufacturer	INTERSIL [Intersil Corporation]

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5

FN8173.1

March 28, 2005

PRINCIPLES OF OPERATION

The X9269 is a integrated microcircuit incorporating

four resistor arrays and their associated registers and

counters and the serial interface logic providing direct

communication between the host and the digitally

controlled potentiometers. This section provides detail

description of the following:

– Resistor Array Description

– Serial Interface Description

– Instruction and Register Description.

Array Description

The X9269 is comprised of a resistor array (See Figure

1). Each array contains 255 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 inputs).

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 Wiper Counter

Register (WCR). The 8-bits of the WCR (WCR[7:0])

are decoded to select, and enable, one of 256

switches (See Table 1).

The WCR may be written directly. These Data

Registers can the WCR can be read and written by the

host system.

Power-up and Down Requirements.

There are no restrictions on the power-up or power-

down conditions of VCC and the voltages applied to

the potentiometer pins provided that VCC is always

more positive than or equal to VH, VL, and VW, i.e.,

VCC ≥ VH, VL, VW. The VCC ramp rate specification is

always in effect.

Figure 1. Detailed Potentiometer Block Diagram

SERIAL DATA PATH

FROM INTERFACE

CIRCUITRY

REGISTER 0

REGISTER 1

REGISTER 2

REGISTER 3

SERIAL

BUS

INPUT

PARALLEL

BUS

INPUT

COUNTER

REGISTER

INC/DEC

LOGIC

UP/DN

CLK

MODIFIED SCL

UP/DN

RH

RL

RW

8

C

O

U

N

T

E

R

D

E

C

O

D

E

IF WCR = 00[H] THEN RW = RL

IF WCR = FF[H] THEN RW = RH

WIPER

(WCR)

One of Two Potentiometers

(DR0)

(DR1)

(DR2)

(DR3)

X9269

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