3

FN8162.4

July 9, 2008

Applications

Circuit Level

• Vary the gain of a voltage amplifier

• Provide programmable DC reference voltages for

comparators and detectors

• Control the volume in audio circuits

• Trim out the offset voltage error in a voltage amplifier

circuit

• Set the output voltage of a voltage regulator

• Trim the resistance in Wheatstone bridge circuits

• Control the gain, characteristic frequency and Q-factor in

filter circuits

• Set the scale factor and zero point in sensor signal

conditioning circuits

• Vary the frequency and duty cycle of timer ICs

• Vary the DC biasing of a pin diode attenuator in RF circuits

• Provide a control variable (I, V, or R) in feedback circuits

System Level

• Adjust the contrast in LCD displays

• Control the power level of LED transmitters in

communication systems

• Set and regulate the DC biasing point in an RF power

amplifier in wireless systems

• Control the gain in audio and home entertainment systems

• Provide the variable DC bias for tuners in RF wireless

systems

• Set the operating points in temperature control systems

• Control the operating point for sensors in industrial

systems

• Trim offset and gain errors in artificial intelligent

systems

Pinout

X9119

(14 LD TSSOP)

TOP VIEW

Bus Interface Pins

SERIAL DATA INPUT/OUTPUT (SDA)

The SDA is a bidirectional serial data input/output pin for a

2-wire slave device and is used to transfer data into and out

of the device. It receives device address, opcode, wiper

register address and data sent from an 2-wire master at the

rising edge of the serial clock SCL, and it shifts out data after

each falling edge of the serial clock SCL.

It is an open drain output and may be wire-ORed with any

number of open drain or open collector outputs. An open

drain output requires the use of a pull-up resistor. For

selecting typical values, refer to the guidelines for calculating

typical values on the bus pull-up resistors graph.

SERIAL CLOCK (SCL)

This input is used by 2-wire master to supply 2-wire serial

clock to the X9119.

The Address inputs are used to set the least significant 3 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 X9119. A maximum

of 8 devices may occupy the 2-wire serial bus.

HARDWARE WRITE PROTECT INPUT (WP)

The WP pin when LOW prevents nonvolatile writes to the

Data Registers.

Potentiometer Pins

connections on a mechanical potentiometer.

1

2

3

4

5

6

7

8

14

13

12

11

10

9

NC

A2

A1

A0

NC

SDA

NC

SCL

WP

Pin Assignments

PIN

NUMBER

PIN NAME

FUNCTION

1, 3, 10

NC

No Connect

2

A0

Device Address for 2-wire bus

4

A2

Device Address for 2-wire bus

5

SCL

Serial Clock for 2-wire bus

6

SDA

Serial Data Input/Output for 2-wire bus

System Ground

8WP

Hardware Write Protect

9

A1

Device Address for 2-wire bus

11

Wiper terminal of the Potentiometer

12

High terminal of the Potentiometer

13

Low terminal of the Potentiometer

14

System Supply Voltage

X9119