參數(shù)資料
型號(hào)： X9455WV24I-2.7
廠商： INTERSIL CORP
元件分類(lèi)： 數(shù)字電位計(jì)
英文描述： Dual Two-wiper Digitally-Controlled (XDCP) Potentiometer
中文描述： DUAL 10K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 256 POSITIONS, PDSO24
封裝： 4.40 MM, TSSOP-24
文件頁(yè)數(shù)： 7/18頁(yè)
文件大?。?/td> 372K
代理商： X9455WV24I-2.7
7
FN8202.0
November 10, 2004
Test Circuit
Equivalent Circuit
Pin Descriptions
Bus Interface Pins
Serial Data Input/Output (SDA)
The SDA is a bidirectional serial data input/output pin for the
2-wire interface. It receives device address, operation code,
wiper register address and data from a 2-wire external
master device at the rising edge of the serial clock SCL, and
it shifts out data after each falling edge of the serial clock
SCL.
SDA requires an external pull-up resistor, since it’s an open
drain output.
Serial Clock (SCL)
This input is the serial clock of the 2-wire and Up/Down
interface.
Device Address (A2-A0)
The Address inputs are used to set the least significant 3 bits
of the 8-bit 2-wire interface slave address. A match in the
slave address serial data stream must be made with the
Address input pins in order to initiate communication with the
X9455. A maximum of 8 devices may occupy the 2-wire
serial bus.
Chip Select (CS)
When the CS pin is low, increment or decrement operations
are possible using the SCL and U/D pins. The 2-wire
interface is disabled at this time. When CS is high, the 2-wire
interface is enabled.
Up or Down Control (U/D)
The U/D input pin is held HIGH during increment operations
and held LOW during decrement operations.
DCP Select (DS1-DS0)
The DS1-DS0 select one of the four DCPs for an Up/Down
interface operation.
Hardware Write Protect Input (WP)
When the WP pin is set low, “write” operations to non volatile
DCP Data Registers are disabled. This includes both 2-wire
interface non-volatile “Write”, and Up/Down interface “Store”
operations.
DCP Pins
R
H0
, R
L0
, R
H1
, R
L1
These pins are equivalent to the terminal connections on
mechanical potentiometers. Since there are two DCPs, there
is one set of R
H
and R
L
for each DCP.
R
W0A
, R
W0B
, R
W1A
, and R
W1B
The wiper pins are equivalent to the wiper terminals of
mechanical potentiometers. Since there are two wipers per
DCP, there are four R
W
pins.
Force
Current
Test Point
R
W
C
H
C
L
R
W
R
TOTAL
C
W
R
H
R
L
X9455
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