X9221AWP datasheet(8/15 Pages) INTERSIL

Part #	X9221AWP

Description	64 Taps, 2-Wire Serial Bus

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Manufacturer	INTERSIL [Intersil Corporation]

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8

FN8163.1

September 14, 2005

DETAILED OPERATION

Both XDCP potentiometers share the serial interface

and share a common architecture. Each potentiometer

is comprised of a resistor array, a wiper counter regis-

ter and four data registers. A detailed discussion of the

register organization and array operation follows.

Wiper Counter Register

The X9221A contains two wiper counter registers

(WCR), one for each XDCP potentiometer. The WCR

can be envisioned as a 6-bit parallel and serial load

counter with its outputs decoded to select one of sixty-

four switches along its resistor array. The contents of

the WCR can be altered in four ways: it may be written

directly by the host via the Write WCR instruction

(serial load); it may be written indirectly by transferring

the contents of one of four associated data registers

via the XFR Data Register instruction (parallel load); it

can be modified one step at a time by the Increment/

Decrement instruction; finally, it is loaded with the con-

tents of its data register zero (R0) upon power-up.

The WCR is a volatile register; that is, its contents are

lost when the X9221A is powered-down. Although the

register is automatically loaded with the value in R0

upon power-up, it should be noted this may be differ-

ent from the value present at power-down.

Data Registers

Each potentiometer has four nonvolatile data regis-

ters. These can be read or written directly by the host

and data can be transferred between any of the four

data registers and the WCR. It should be noted all

operations changing data in one of these registers is a

nonvolatile operation and will take a maximum of

10ms.

If the application does not require storage of multiple

settings for the potentiometer, these registers can be

used as regular memory locations that could possibly

store system parameters or user preference data.

Figure 8. Detailed Potentiometer Block Diagram

Serial Data Path

From Interface

Circuitry

Register 0

Register 1

Register 2

Register 3

Serial

Bus

Input

Parallel

Bus

Input

Wiper

Counter

Register

INC/DEC

Logic

UP/DN

CLK

Modified SCL

UP/DN

VH/RH

If WCR = 00[H] then VW/RW = VL/RL

If WCR = 3F[H] then VW/RW = VH/RH

8

6

C

D

e

o

u

n

t

e

r

e

c

o

d

VL/RL

VW/RW

X9221A

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