X9252 Xicor, X9252 Datasheet - Page 9

• Manufacturer Part Number: X9252
• Description: Quad Digitally-Controlled (XDCP) potentiometer
• Manufacturer: Xicor

PIN DESCRIPTIONS
Bus Interface Pins
S
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.
S
This input is the serial clock of the 2-wire and Up/Down
interface.
D
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 X9252. A maximum of 8
devices may occupy the 2-wire serial bus.
C
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.
REV 1.4.1 7/29/03
ERIAL
ERIAL
EVICE
HIP
S
ELECT
D
C
A
ATA
LOCK
DDRESS
(CS)
I
NPUT
(SCL)
(A2–A0)
/O
UTPUT
(SDA)
www.xicor.com
U
The U/D input pin is held HIGH during increment oper-
ations and held LOW during decrement operations.
DCP S
The DS1-DS0 select one of the four DCPs for an Up/
Down interface operation.
H
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
These pins are equivalent to the terminal connections
on mechanical potentiometers. Since there are 4
DCPs, there is one set of R
R
The wiper pins are equivalent to the wiper terminal of
mechanical potentiometers. Since there are four
DCPs, there are 4 R
P OR
ARDWARE
H0
W0
, R
, R
D
ELECT
L0
W1
OWN
, R
W
, R
C
RITE
H1
(DS1-DS0)
W2
ONTROL
, R
,
P
AND
L1
ROTECT
, R
W
(U/D)
R
pins.
H2
W3
I
, R
NPUT
H
L2
and R
(WP)
, R
H3
L
,
for each DCP.
AND
R
L3
X9252
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