X9261 datasheet(5/21 Pages) INTERSIL

Part #	X9261

Description	Single Supply/Low Power/256-Tap/SPI Bus

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Manufacturer	INTERSIL [Intersil Corporation]

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5

FN8171.2

September 14, 2005

Potentiometer Pins

RH, RL

The RH and RL pins are equivalent to the terminal

connections on a mechanical potentiometer. Since

there are 2 potentiometers, there are 2 sets of RH and

RL such that RH0 and RL0 are the terminals of POT 0

and so on.

RW

The wiper pin are equivalent to the wiper terminal of a

mechanical

potentiometer.

Since

there

are

2

potentiometers, there are 2 sets of RW such that RW0

is the terminals of POT 0 and so on.

Supply Pins

SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY

GROUND (VSS)

The VCC pin is the system supply voltage. The VSS

pin is the system ground.

Other Pins

NO CONNECT

No connect pins should be left floating. This pins are

used for Intersil manufacturing and testing purposes.

HARDWARE WRITE PROTECT INPUT (WP)

The WP pin when LOW prevents nonvolatile writes to

the Data Registers.

PRINCIPLES OF OPERATION

Serial Interface

The X9261 supports the SPI interface hardware

conventions. The device is accessed via the SI input

with data clocked in on the rising SCK. CS must be

LOW and the HOLD and WP pins must be HIGH

during the entire operation.

The SO and SI pins can be connected together, since

they have three state outputs. This can help to reduce

system pin count.

Array Description

The X9261 is comprised of a resistor array (See

Figure 1). The array contains the equivalent of 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).

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.

X9261

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