X9119_14 Datasheet, PDF (3/17 Pages) Intersil Corporation – Single Digitally-Controlled Potentiometer

X9119
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
NC
1
A0 2
NC
3
A2
4
SCL 5
SDA
6
V_SS
7
14
V_CC
13
R_L
12
R_H
11
R_W
10
NC
9
A1
8
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
7
V_SS System Ground
8
WP Hardware Write Protect
9
A1 Device Address for 2-wire bus
11
R_W Wiper terminal of the Potentiometer
12
R_H High terminal of the Potentiometer
13
R_L
Low terminal of the Potentiometer
14
V_CC System Supply Voltage
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.
DEVICE ADDRESS (A₂–A₀)
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
R_H, R_L
The R_H and R_L pins are equivalent to the terminal
connections on a mechanical potentiometer.
3
FN8162.4
July 9, 2008