X9420WS datasheet(2/20 Pages) INTERSIL

2 / 20 page

FN8195.0

March 7, 2005

PIN DESCRIPTIONS

Host Interface Pins

Serial Output (SO)

SO is a push/pull 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 potentiometer

and pot register 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

X9420.

Chip Select (CS)

When CS is HIGH, the X9420 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 X9420, 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.

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.

Device Address (A0)

The address inputs is used to set the least significant

bit of 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 X9420. A maximum of 2 devices may occupy the

SPI serial bus.

Potentiometer Pins

VH/RH, VL/RL

The VH/RH and VL/RL input are equivalent to the

terminal connections on either end of a mechanical

potentiometer.

VW/RW

The wiper output is equivalent to the wiper output of a

mechanical potentiometer.

Hardware Write Protect Input (WP)

The WP pin when LOW prevents nonvolatile writes to

the Data Registers. Writing to the Wiper Counter

Analog Supplies (V+, V-)

The analog supplies V+, V- are the supply voltages for

the XDCP analog section.

System/Digital Supply (VCC)

VCC is the supply voltage for the system/digital

section. VSS is the system ground.

PIN CONFIGURATION

VCC

RL/VL

VSS

V+

HOLD

SCK

V-

DIP/SOIC

X9420

RH/VH

RW/VW

TSSOP

VCC

RL/VL

VSS

V+

HOLD

SCK

V-

X9420

RH/VH

RW/VW

X9420

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