X9410 datasheet(2/21 Pages) XICOR

2 / 21 page

X9410

Characteristics subject to change without notice.

2 of 21

REV 1.1 10/6/00

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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 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

X9410.

Chip Select (CS)

When CS is HIGH, the X9410 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 X9410, 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

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–A1)

The address inputs are used to set the least signiﬁcant

2 bits 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 X9410. A maximum of 4 devices may occupy the

SPI serial bus.

Potentiometer Pins

VH/RH (VH0/RH0—VH1/RH1), VL/RL (VL0/RL0—VL1/RL1)

The VH/RH and VL/RL inputs are equivalent to the terminal

connections on either end of a mechanical potentiometer.

VW/RW (VW0/RW0—VW1/RW1)

The wiper outputs are 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.

Analog Supplies (V+, V-)

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

the XDCP analog section.

PIN CONFIGURATION

VCC

VL0/RL0

VH0/RH0

V+

HOLD

SCK

DIP/SOIC

X9410

VSS

VW0/RW0

VL1/RL1

VH1/RH1

VW1/RW1

V-

VL1/RL1

VW0/RW0

VH0/RH0

VL0/RL0

VCC

TSSOP

X9410

HOLD

VH1/RH1

VW1/RW1

SCK

VSS

V+

V-

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