X9410 Xicor, X9410 Datasheet - Page 3

• Manufacturer Part Number: X9410
• Description: Dual Digitally Controlled Potentiometer
• Manufacturer: Xicor

X9410
PIN NAMES
DEVICE DESCRIPTION
The
incorporating two resistor arrays and their associated
registers and counters and the serial interface logic
providing direct communication between the host and
the XDCP potentiometers.
Serial Interface
The X9410 supports the SPI interface hardware
conventions. The device is accessed via the SI input
with data clocked in on the rising SCK. CS must be
LOW and the HOLD and WP pins must be HIGH during
the entire operation.
The SO and SI pins can be connected together, since
they have three state outputs. This can help to reduce
system pin count.
Array Description
The X9410 is comprised of two resistor arrays. Each
array contains 63 discrete resistive segments that are
connected in series. The physical ends of each array
are equivalent to the fixed terminals of a mechanical
potentiometer (V
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(V
switch may be turned on at a time.
REV 1.1 10/6/00
SCK
S
A
V
V
V
WP
V+,V-
V
V
NC
W
I
0
H0
L0
W0
CC
SS
, S
-A
/R
/R
/R
/R
O
1
X9410
W
L0
H0
W0
) output. Within each individual array only one
Symbol
–V
–V
–V
L1
H1
W1
/R
/R
is
L1
/R
H1
H
W1
/R
,
a
H
and V
highly
Serial Clock
Serial Data
Device Address
Potentiometer Pins
(terminal equivalent)
Potentiometer Pin
(wiper equivalent)
Hardware Write Protection
Analog Supplies
System Supply Voltage
System Ground
No Connection
L
/R
integrated
L
inputs).
Description
microcircuit
www.xicor.com
These switches are controlled by a Wiper Counter
Register (WCR). The six bits of the WCR are decoded
to select, and enable, one of sixty-four switches.
Wiper Counter Register (WCR)
The X9410 contains two Wiper Counter Registers, one
for each XDCP potentiometer. The WCR is equivalent
to a serial-in, parallel-out register/counter with its
outputs decoded to select one of sixty-four switches
along its resistor array. The contents of the WCR can
be altered in four ways: it may be written directly by the
host via the Write Wiper Counter Register instruction
(serial load); it may be written indirectly by transferring
the contents of one of four associated Data Registers
via the XFR Data Register or Global XFR Data
Register instructions (parallel load); it can be modified
one step at a time by the Increment/ Decrement
instruction. Finally, it is loaded with the contents of its
Data Register zero (DR0) upon power-up.
The Wiper Counter Register is a volatile register; that
is, its contents are lost when the X9410 is powered-
down. Although the register is automatically loaded
with the value in DR0 upon power-up, this may be
different from the value present at power-down.
Data Registers
Each potentiometer has four 6-bit nonvolatile Data
Registers. These can be read or written directly by the
host. Data can also be transferred between any of the
four Data Registers and the associated Wiper Counter
Register. All operations changing data in one of the
Data Registers is a nonvolatile operation and will take a
maximum of 10ms.
If the application does not require storage of multiple
settings for the potentiometer, the Data Registers can
be used as regular memory locations for system
parameters or user preference data.
Data Register Detail
(MSB)
NV
D5
NV
D4
Characteristics subject to change without notice.
NV
D3
NV
D2
D1
NV
(LSB)
NV
D0
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