X9119 Datasheet, PDF (3/18 Pages) Xilinx, Inc – Single Digitally-Controlled (XDCP ™ ) Potentiometer

X9119
PIN CONFIGURATION
NC
A0
NC
A2
SCL
SDA
V_SS
TSSOP
1
14
2
13
3
12
4 ^X9119 11
5
10
6
9
7
8
V_CC
R_L
R_H
R_W
NC
A1
WP
PIN ASSIGNMENTS
Pin
(TSSOP)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
NC
A0
NC
A2
SCL
SDA
V_SS
WP
A1
NC
R_W
R_H
R_L
V_CC
Function
No Connect
Device Address for 2-wire bus
No Connect
Device Address for 2-wire bus
Serial Clock for 2-wire bus
Serial Data Input/Output for 2-wire bus
System Ground
Hardware Write Protect
Device Address for 2-wire bus
No Connect
Wiper terminal of the Potentiometer
High terminal of the Potentiometer
Low terminal of the Potentiometer
System Supply Voltage
PIN DESCRIPTIONS
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.
R_W
The wiper pin are equivalent to the wiper terminal of a
mechanical potentiometer.
Bias Supply Pins
SYSTEM SUPPLY VOLTAGE (V_CC) AND SUPPLY
GROUND (V_SS)
The V_CC pin is the system supply voltage. The V_SS
pin is the system ground.
Other Pins
NO CONNECT
No connect pins should be left open. These pins are
used for Intersil manufacturing and testing purposes.
PRINCIPLES OF OPERATION
The X9119 is an integrated microcircuit incorporating
a resistor array and its associated registers and
counters and the serial interface logic providing direct
communication between the host and the digitally
controlled potentiometer. This section provides detail
description of the following:
– Resistor Array Description
– Serial Interface Description
– Instruction and Register Description
3
FN8162.2
September 15, 2005