X9260 INTERSIL [Intersil Corporation], X9260 Datasheet - Page 4

• Manufacturer Part Number: X9260
• Description: Dual Supply/Low Power/256-Tap/SPI bus
• Manufacturer: INTERSIL [Intersil Corporation]

PIN DESCRIPTIONS
Bus Interface Pins
S
SO is a serial data output pin. During a read cycle,
data is shifted out on this pin. Data is clocked out by
the falling edge of the serial clock.
S
SI is the serial data input pin. All opcodes, byte
addresses and data to be written to the pots and pot
registers are input on this pin. Data is latched by the
rising edge of the serial clock.
S
The SCK input is used to clock data into and out of the
X9260.
H
HOLD is used in conjunction with the CS pin to select
the device. Once the part is selected and a serial
sequence is underway, HOLD may be used to pause
the serial communication with the controller without
resetting the serial sequence. To pause, HOLD must
be brought LOW while SCK is LOW. To resume
communication, HOLD is brought HIGH, again while
SCK is LOW. If the pause feature is not used, HOLD
should be held HIGH at all times.
D
The address inputs are used to set the 4-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 X9260.
C
When CS is HIGH, the X9260 is deselected and the
SO pin is at high impedance, and (unless an internal
write cycle is underway) the device will be in the
standby state. CS LOW enables the X9260, placing it
in the active power mode. It should be noted that after
a power-up, a HIGH to LOW transition on CS is
required prior to the start of any operation.
ERIAL
ERIAL
ERIAL
OLD
EVICE
HIP
S
(HOLD)
ELECT
O
I
C
A
NPUT
LOCK
UTPUT
DDRESS
(CS)
(SCK)
(SO)
(A1 - A0)
4
X9260
Potentiometer Pins
R
The R
connections on a mechanical potentiometer. Since
there are 2 potentiometers, there are 2 sets of R
R
and so on.
R
The wiper pin are equivalent to the wiper terminal of a
mechanical
potentiometers, there are 2 sets of R
is the terminals of POT 0 and so on.
Supply Pins
S
G
The V
pin is the system ground.
Analog Supply Voltages (V+ and V
These supplies are the analog voltage supplies for the
potentiometer. The V+ supply is tied to the wiper
switches while the V- supply is used to bias the
switches and the internal P+ substrate of the
integrated circuit. Both of these supplies set the
voltage limits of the potentiometer.
Other Pins
N
No connect pins should be left floating. This pins are
used for Intersil manufacturing and testing purposes.
H
The WP pin when LOW prevents nonvolatile writes to
the Data Registers.
YSTEM
H
L
W
O
ARDWARE
ROUND
, R
such that R
C
ONNECT
L
CC
H
S
and R
(V
pin is the system supply voltage. The V
UPPLY
SS
W
potentiometer.
)
H0
RITE
L
pins are equivalent to the terminal
V
and R
OLTAGE
P
ROTECT
L0
are the terminals of POT 0
(V
I
CC
Since
NPUT
)
AND
-
W
(WP)
)
there
such that R
S
UPPLY
February 28, 2005
are
FN8170.0
H
and
W0
SS
2