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X9259UV24IZ-2.7 Datasheet(PDF) 4 Page - Intersil Corporation

Part # X9259UV24IZ-2.7
Description  Single Supply/Low Power/256-Tap/2-Wire Bus Quad Digitally-Controlled (XDCP) Potentiometers
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X9259UV24IZ-2.7 Datasheet(HTML) 4 Page - Intersil Corporation

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X9259
4
FN8169.6
December 12, 2014
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Functional 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 a 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.
SERIAL CLOCK (SCL)
This input is used by a 2-wire master to supply a 2-wire serial
clock to the X9259.
DEVICE ADDRESS (A3 THROUGH A0)
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 X9259. A maximum of 16 devices may
occupy the 2-wire serial bus. Device pins A3 through A0 must be
tied to a logic level, which specifies the external address of the
device, see Figures 3, 4, and 5.
Potentiometer Pins
RH, RL
The RH and RL pins are equivalent to the terminal connections on
a mechanical potentiometer. Since there are 4 potentiometers,
there are 4 sets of RH and RL such that RH0 and RL0 are the
terminals of DCP0 and so on.
RW
The wiper pin are equivalent to the wiper terminal of a
mechanical potentiometer. Since there are 4 potentiometers,
there are 4 sets of RW such that RW0 is the terminal of DCP0 and
so on.
Bias Supply Pins
SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY
GROUND (VSS)
The VCC pin is the system supply voltage. The VSS 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.
HARDWARE WRITE PROTECT INPUT (WP)
The WP pin when LOW, prevents nonvolatile writes to the Data
Registers.
SERIAL DATA PATH
FROM INTERFACE
CIRCUITRY
DR#0
SERIAL
BUS
INPUT
PARALLEL
BUS
INPUT
COUNTER
REGISTER
INC/DEC
LOGIC
UP/DN
CLK
MODIFIED SCK
UP/DN
8
8
COUNTER
IF WCR = 00[H] then RW is closest to RL
IF WCR = FF[H] then RW is closest to RH
WIPER
(WCR#)
#: 0, 1, 2, or 3
One of Four Potentiometers
DR#2
DR#1
DR#3
- - -
DECODE
DCP
CORE
RW
RH
RL
FIGURE 1. DETAILED POTENTIOMETER BLOCK DIAGRAM


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