參數(shù)資料
型號(hào): X9400YV24
元件分類: 數(shù)字電位計(jì)
英文描述: QUAD 2.5K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO24
封裝: PLASTIC, TSSOP-24
文件頁數(shù): 17/22頁
文件大小: 555K
代理商: X9400YV24
X9400
Characteristics subject to change without notice.
4 of 22
REV 1.1.8 3/31/04
www.xicor.com
Write in Process
The contents of the Data Registers are saved to
nonvolatile memory when the CS pin goes from LOW
to HIGH after a complete write sequence is received by
the device. The progress of this internal write operation
can be monitored by a write in process bit (WIP). The
WIP bit is read with a read status command.
INSTRUCTIONS
Identification (ID) Byte
The rst byte sent to the X9400 from the host, following
a CS going HIGH to LOW, is called the Identication
byte. The most signicant four bits of the slave address
are a device type identier, for the X9400 this is xed
as 0101[B] (refer to Figure 2).
The two least signicant bits in the ID byte select one of
four devices on the bus. The physical device address is
dened by the state of the A0-A1 input pins. The X9400
compares the serial data stream with the address input
state; a successful compare of both address bits is
required for the X9400 to successfully continue the
command sequence. The A0–A1 inputs can be actively
driven by CMOS input signals or tied to VCC or VSS.
The remaining two bits in the slave byte must be set to 0.
Figure 2. Identification Byte Format
Instruction Byte
The next byte sent to the X9400 contains the
instruction and register pointer information. The four
most signicant bits are the instruction. The next four
bits point to one of the four pots and, when applicable,
they point to one of four associated registers. The
format is shown below in Figure 3.
1
00
A1
A0
Device Type
Identifier
Device Address
1
Figure 1. Detailed Potentiometer Block Diagram
Serial Data Path
From Interface
Circuitry
Register 0
Register 1
Register 2
Register 3
Serial
Bus
Input
Parallel
Bus
Input
Wiper
Counter
Register
INC/DEC
Logic
UP/DN
CLK
Modified SCL
UP/DN
VH/RH
VL/RL
VW/RW
If WCR = 00[H] then VW/RW = VL/RL
If WCR = 3F[H] then VW/RW = VH/RH
8
6
C
o
u
n
t
e
r
D
e
c
o
d
e
(WCR)
(One of Four Arrays)
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