X9271TVI datasheet(4/22 Pages) INTERSIL

Part #	X9271TVI

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

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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4

FN8174.1

March 31, 2005

PIN DESCRIPTIONS

Bus Interface Pins

SERIAL OUTPUT (SO)

SO is a serial data output pin. During a read cycle,

data is shifted out on this pin. Data is clocked out by

the falling edge of the serial clock.

SERIAL INPUT

SI is the serial data input pin. All opcodes, byte

addresses and data to be written to the pots and pot

registers are input on this pin. Data is latched by the

rising edge of the serial clock.

SERIAL CLOCK (SCK)

The SCK input is used to clock data into and out of the

X9271.

HOLD (HOLD)

HOLD is used in conjunction with the CS pin to select

the device. Once the part is selected and a serial

sequence is underway, HOLD may be used to pause the

serial communication with the controller without resetting

the serial sequence. To pause, HOLD must be brought

LOW while SCK is LOW. To resume communication,

HOLD is brought HIGH, again while SCK is LOW. If the

pause feature is not used, HOLD should be held HIGH at

all times. CMOS level input.

DEVICE ADDRESS (A1 - A0)

The address inputs are used to set the the 8-bit slave

address. A match in the slave address serial data

stream must be made with the address input in order

to initiate communication with the X9271.

CHIP SELECT (CS)

When CS is HIGH, the X9271 is deselected and the

SO pin is at high impedance, and (unless an internal

write cycle is underway) the device will be in the

standby state. CS LOW enables the X9271, placing it

in the active power mode. It should be noted that after

a power-up, a HIGH to LOW transition on CS is

required prior to the start of any operation.

Potentiometer Pins

RH, RL

The RH and RL pins are equivalent to the terminal

connections on a mechanical potentiometer.

RW

The wiper pin are equivalent to the wiper terminal of a

mechanical potentiometer.

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

HARDWARE WRITE PROTECT INPUT (WP)

The WP pin when LOW prevents nonvolatile writes to

the Data Registers.

NO CONNECT.

No connect pins should be left floating. This pins are

used for Intersil manufacturing and testing purposes.

X9271

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