X9110

FN8158 Rev 5.00

Page 3 of 18

October 28, 2016

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 on the falling edge of the

serial clock.

SERIAL INPUT (SI)

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

data to be written to the potentiometer 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 X9110.

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.

Detailed Functional Diagram

FIGURE 2. DETAILED FUNCTIONAL DIAGRAM

CS

SCK

A0

SO

SI

HOLD

WP

INTERFACE

AND

CONTROL

CIRCUITRY

V-

V+

DR0

DR1

DR2

DR3

WIPER

COUNTER

REGISTER

(WCR)

DATA

1024-TAPS

100kΩ

CONTROL

POWER ON

RECALL

Pin Configuration

X9110

14 LD TSSOP

TOP VIEW

Pin Descriptions

PIN

(TSSOP)

SYMBOL

FUNCTION

1

V+

Analog Supply Voltage

2

SO

Serial Data Output

3

A0

Device Address

4

SCK

Serial Clock

5WP

Hardware Write Protect

6

SI

Serial Data Input

System Ground

8

V-

Analog Supply Voltage

9CS

Chip Select

10

HOLD

Device Select. Pause the Serial Bus

1

2

3

4

5

6

7

8

14

13

12

11

10

9

A0

SCK

CS

SO

V+

SI

HOLD

WP

V-

11

Wiper Terminal of the Potentiometer

12

High Terminal of the Potentiometer

13

Low Terminal of the Potentiometer

14

System Supply Voltage

PIN

(TSSOP)

SYMBOL

FUNCTION