X9260 datasheet(4/23 Pages) RENESAS

4 / 23 page

FN8170.3

August 29, 2006

PIN ASSIGNMENTS

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

X9260.

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 (A1 - A0)

The address inputs are used to set the 4-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 X9260.

CHIP SELECT (CS)

When CS is HIGH, the X9260 is deselected and the

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

write cycle is underway) the device will be in the

(SOIC)

Symbol

Function

Serial Data Output for SPI bus

Device Address for SPI bus.

No Connect.

V+

Analog Supply Voltage (Positive)

7VCC

System Supply Voltage

8RL0

Low Terminal for Potentiometer 0.

9RH0

High Terminal for Potentiometer 0.

RW0

Wiper Terminal for Potentiometer 0.

Device Address for SPI bus.

Hardware Write Protect

Serial Data Input for SPI bus

Device Address for SPI bus.

RL1

Low Terminal for Potentiometer 1.

RH1

High Terminal for Potentiometer 1.

RW1

Wiper Terminal for Potentiometer 1.

VSS

System Ground

V-

Analog Supply Voltage (Negative)

No Connect

SCK

Serial Clock for SPI bus

HOLD

Device select. Pause the SPI serial bus.

X9260

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