X9252 datasheet(8/19 Pages) INTERSIL

Part #	X9252

Description	Low Power Quad 256-Tap 2-Wire Bus Up/Down Interface

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Manufacturer	INTERSIL [Intersil Corporation]

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8

FN8167.1

September 14, 2005

Test Circuit

Equivalent Circuit

Principles of Operation

The X9252 is an integrated circuit incorporating four resistor

arrays, 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

- Up/Down Interface

- 2-wire Interface

Resistor Array Description

The X9252 is comprised of four resistor arrays. 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 (RHi and

RLi inputs) (See Figure 1.)

At both ends of each array and between each resistor

segment is a switch connected to the wiper (RWi) pin.

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). Note

that each wiper has a dedicated WCR. When all bits of a

WCR are zeroes, the switch closest to the corresponding RL

pin is selected. When all bits of a WCR are ones, the switch

closest to the corresponding RH pin is selected.

The WCR is volatile and may be written directly. There are

four non-volatile Data Registers (DR) associated with each

WCR. Each DR can be loaded into WCR. All DRs and

WCRs can be read or written.

Power Up and Down Requirements

During power up, CS must be high, to avoid inadvertant

“store” operations. At power up, the contents of Data

Registers DR00, DR10, DR20, and DR30, are loaded into

the corresponding wiper counter register.

Force

Current

Test Point

RW

CH

CL

RW

RTOTAL

CW

RH

RL

One

WCR[7:0]

RHi

RWi

RLi

= FF hex

255

254

253

252

of

256

Decoder

Volatile

8-bit

Wiper

Counter

Register

WCRi

Four

Non-Volatile

Data

Registers

DRi0, DRi1,

DRi2, and

DRi3

i = 0, 1, 2, and 3

Interface Control and

WCR[7:0]

= 00 hex

2

1

0

Volatile Status Register (SR)

(Shared by the Four DCPs)

WP

SCL

SDA

A2, A1, A0

CS

U/D

DS1, DS0

FIGURE 1. DETAILED BLOCK DIAGRAM OF ONE DCP

X9252

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Manufacturer	Part #	Datasheet	Description
Renesas Technology Corp	X9252	800Kb / 19P	Low Power Quad 256-tap 2-Wire Bus Up/Down Interface Quad Digitally-Controlled (XDCP?? Potentiometer
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