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X9241 데이터시트(PDF) 2 Page - Xicor Inc.

부품명 X9241
상세설명  Quad E2POT??Nonvolatile Digital Potentiometer
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제조업체  XICOR [Xicor Inc.]
홈페이지  http://www.xicor.com
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X9241 데이터시트(HTML) 2 Page - Xicor Inc.

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X9241
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9241.
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
X9241.
Potentiometer Pins
VH (VH0 – VH3), VL (VL0 – VL3)
The VH and VL inputs are equivalent to the terminal
connections on either end of a mechanical potentiom-
eter.
VW (VW0 – VW3)
The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.
PIN CONFIGURATION
PIN NAMES
Symbol
Description
SCL
Serial Clock
SDA
Serial Data
A0–A3
Address
VH0–VH3, VL0–VL3
Potentiometers
(terminal equivalent)
VW0–VW3
Potentiometers
(wiper equivalent)
3864 PGM T01
PRINCIPLES OF OPERATION
The X9241 is a highly integrated microcircuit incorporat-
ing four resistor arrays, their associated registers and
counters and the serial interface logic providing direct
communication between the host and the E2POT poten-
tiometers.
Serial Interface
The X9241 supports a bidirectional bus oriented proto-
col. The protocol defines any device that sends data
onto the bus as a transmitter and the receiving device as
the receiver. The device controlling the transfer is a
master and the device being controlled is the slave. The
master will always initiate data transfers and provide the
clock for both transmit and receive operations. There-
fore, the X9241 will be considered a slave device in all
applications.
Clock and Data Conventions
Data states on the SDA line can change only during
SCL LOW periods (tLOW). SDA state changes during
SCL HIGH are reserved for indicating start and stop
conditions.
Start Condition
All commands to the X9241 are preceded by the start
condition, which is a HIGH to LOW transition of SDA
while SCL is HIGH (tHIGH). The X9241 continuously
monitors the SDA and SCL lines for the start condition
and will not respond to any command until this condition
is met.
Stop Condition
All communications must be terminated by a stop con-
dition, which is a LOW to HIGH transition of SDA while
SCL is HIGH.
3864 ILL F01A.2
VW0
VL0
VH0
A0
A2
VW1
VL1
VH1
SDA
VSS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCC
VW3
VL3
VH3
A1
A3
SCL
VW2
VL2
VH2
DIP/SOIC/TSSOP
X9241


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