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X9241A Datasheet Preview

X9241A Datasheet

Quad Digitally Controlled Potentiometer (XDCP)

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APPLICATION NOTE
AVAILABLE
AN20 • AN42–48 • AN50-53 • AN73 • AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Power/2-Wire Serial Bus
X9241A
Quad Digitally Controlled Potentiometer (XDCP)
FEATURES
• Four potentiometers in one package
• 2-wire serial interface
• Register oriented format
—Direct read/write/transfer of wiper positions
—Store as many as four positions per
potentiometer
• Terminal Voltages: +5V, -3.0V
• Cascade resistor arrays
• Low power CMOS
• High Reliability
—Endurance–100,000 data changes per bit per
register
—Register data retention–100 years
• 16-bytes of nonvolatile memory
• 3 resistor array values
—2Kto 50Kmask programmable
—Cascadable for values of 500to 200K
• Resolution: 64 taps each pot
• 20-lead plastic DIP, 20-lead TSSOP and 20-lead
SOIC packages
DESCRIPTION
The X9241A integrates four digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
The digitally controlled potentiometer is implemented
using 63 resistive elements in a series array. Between
each element are tap points connected to the wiper
terminal through switches. The position of the wiper on
the array is controlled by the user through the 2-wire
bus interface. Each potentiometer has associated with
it a volatile Wiper Counter Register (WCR) and 4
nonvolatile Data Registers (DR0:DR3) that can be
directly written to and read by the user. The contents
of the WCR controls the position of the wiper on the
resistor array through the switches. Power up recalls
the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
BLOCK DIAGRAM
VCC
VSS
SCL
SDA
A0
A1
A2
A3
Interface
and
Control
Circuitry
8
Data
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH0/RH0
VL0/RL0
VW0/RW0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Register
Array
Pot 2
VH2/
RH2
VL2/RL2
VW2/RW2
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Register
Array
Pot 1
VH1/RH1
VL1/RL1
VW1/RW1
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Register
Array
Pot 3
VH3/RH3
VL3/RL3
VW3/RW3
REV 1.1.13 12/09/02
www.xicor.com
Characteristics subject to change without notice. 1 of 18




Xicor

X9241A Datasheet Preview

X9241A Datasheet

Quad Digitally Controlled Potentiometer (XDCP)

No Preview Available !

X9241A
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9241A.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into
and out of the device. 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.
Address
The Address inputs are used to set the least
significant 4 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 X9241A.
Potentiometer Pins
VH/RH(VH0/RH0—VH3/RH3), VL/RL (VL0/RL0—VL3/RL3)
The RH and RL inputs are equivalent to the terminal
connections on either end of a mechanical
potentiometer.
VW/RW (VW0/RW0—VW3/RW3)
The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.
PIN CONFIGURATION
DIP/SOIC/TSSOP
VW0/RW0
VL0/RL0
VH0/RH0
A0
A2
VW1/RW1
VL1/RL1
VH1/RH1
SDA
VSS
1 20
2 19
3 18
4 17
5 16
X9241A
6 15
7 14
8 13
9 12
10 11
VCC
VW3/RW3
VL3/RL3
VH3/RH3
A1
A3
SCL
VW2/RW2
VL2/RL2
VH2/RH2
PIN NAMES
Symbol
SCL
SDA
A0–A3
VH0/RH0–VH3/RH3,
VL0/RL0–VL3/RL3
VW0/RW0–VW3/RW3
Description
Serial Clock
Serial Data
Address
Potentiometer Pins
(terminal equivalent)
Potentiometer Pins
(wiper equivalent)
PRINCIPLES OF OPERATION
The X9241A is a highly integrated microcircuit
incorporating four resistor arrays, their associated
registers and counters and the serial interface logic
providing direct communication between the host and
the XDCP potentiometers.
REV 1.1.13 12/09/02
www.xicor.com
Characteristics subject to change without notice. 2 of 18


Part Number X9241A
Description Quad Digitally Controlled Potentiometer (XDCP)
Maker Xicor
Total Page 18 Pages
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