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參數(shù)資料
| 型號(hào)： | X9119TB15I-2.7 |
| 英文描述： | CLAMP |
| 中文描述： | 單數(shù)字控制電位器 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大?。?/td> | 131K |
| 代理商： | X9119TB15I-2.7 |
X9119 – Preliminary Information
Characteristics subject to change without notice.
4 of 22
REV 1.1.11 3/12/02
www.xicor.com
PIN DESCRIPTIONS
Bus Interface Pins
S
ERIAL
D
ATA
I
NPUT
/O
UTPUT
(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.
S
ERIAL
C
LOCK
(SCL)
This input is used by 2-wire master to supply 2-wire
serial clock to the X9119.
D
EVICE
A
DDRESS
(A
2
–A
0
)
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
connections on a mechanical potentiometer.
H
and R
L
pins are equivalent to the terminal
R
W
The wiper pin are equivalent to the wiper terminal of a
mechanical potentiometer.
Bias Supply Pins
S
YSTEM
S
UPPLY
V
OLTAGE
(V
CC
)
AND
S
UPPLY
G
ROUND
(V
SS
pin
)
The V
is the system ground.
CC
pin is the system supply voltage. The V
SS
Other Pins
N
O
C
ONNECT
No connect pins should be left open. These pins are
used for Xicor 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
Resistor Array Description
The X9119 is comprised of a resistor array. The array
contains, in effect, 1023 discrete resistive segments
that are connected in series (see Figure 1). The
physical ends of each array are equivalent to the fixed
terminals of a mechanical potentiometer (R
inputs).
H
and R
L
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(R
W
) output. Within each individual array only one
switch may be turned on at a time. These switches are
controlled by the Wiper Counter Register (WCR). The
10-bits of the WCR (WCR[9:0]) are decoded to select,
and enable, one of 1024 switches.
The WCR may be written directly. The Data Registers
and the WCR can be read and written by the host
system.
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