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參數(shù)資料
| 型號(hào)： | X9401WS24-2.7 |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | QUAD 10K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO24 |
| 封裝： | PLASTIC, SOIC-24 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大小： | 176K |
| 代理商： | X9401WS24-2.7 |
X9401
– Preliminary Information
Characteristics subject to change without notice.
3 of 21
REV 1.9 4/13/04
www.xicor.com
PIN NAMES
DEVICE DESCRIPTION
The X9401 is a highly integrated microcircuit incorpo-
rating four resistor arrays and their associated regis-
ters and counters and the serial interface logic
providing direct communication between the host and
the XDCP potentiometers.
Serial Interface
The X9401 supports the SPI interface hardware con-
ventions. 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 X9401 is comprised of four resistor arrays. Each
array contains 63 discrete resistive segments that are
connected in series. The physical ends of each array
are equivalent to the xed terminals of a mechanical
potentiometer (VH/RH and VL/RL inputs).
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(VW/RW) output. Within each individual array only one
switch may be turned on at a time.
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 X9401 contains four Wiper Counter Registers,
one for each XDCP potentiometer. The WCR is equiv-
alent 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 Regis-
ter instructions (parallel load); it can be modied one
step at a time by the Increment/Decrement instruction.
Finally, it is loaded with the contents of its data register
zero (R0) upon power-up.
The Wiper Counter Register is a volatile register; that
is, its contents are lost when the X9401 is powered-
down. Although the register is automatically loaded
with the value in R0 upon power-up, this may be differ-
ent from the value present at power-down. The wiper
position must be stored in R0 to insure restoring the
wiper position after power-up.
Data Registers
Each potentiometer has four 6-bit nonvolatile data reg-
isters. 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 memory locations for system parameters
or user preference data.
Data Register Detail
Symbol
Description
SCK
Serial Clock
SI, SO
Serial Data
A0-A1
Device Address
VH0/RH0–VH3/RH3,
VL0/RL0–VL3/RL3
Potentiometers (terminal
equivalent)
VW0/RW0–VW1/RW1
Potentiometers (wiper
equivalent)
WP
Hardware Write Protection
VCC
System Supply Voltage
VSS
System Ground
NC
No Connection
(MSB)
(LSB)
D5
D4
D3
D2
D1
D0
NV
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