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X9250TS24I-2.7 参数 Datasheet PDF下载

X9250TS24I-2.7图片预览
型号: X9250TS24I-2.7
PDF下载: 下载PDF文件 查看货源
内容描述: 四通道数字电位器( XDCP ) [Quad Digitally Controlled Potentiometers (XDCP)]
分类和应用: 转换器电位器数字电位计
文件页数/大小: 21 页 / 182 K
品牌: XICOR [ XICOR INC. ]
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X9250  
PIN NAMES  
Wiper Counter Register (WCR)  
The X9250 contains four 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 256 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.  
Symbol  
Description  
Serial Clock  
SCK  
SI, SO  
Serial Data  
A -A  
Device Address  
0
1
V
V
/R  
/R  
V
/R  
,
Potentiometer Pins  
(terminal equivalent)  
H0 H0– H3 H3  
V /R  
L0 L0– L3 L3  
V
/R  
V
/R  
Potentiometer Pins  
(wiper equivalent)  
W0 W0– W3 W3  
WP  
Hardware Write Protection  
Analog Supplies  
V+,V-  
V
System Supply Voltage  
System Ground  
CC  
V
SS  
The Wiper Counter Register is a volatile register; that  
is, its contents are lost when the X9250 is powered-  
down. Although the register is automatically loaded  
with the value in R0 upon power-up, this may be  
different from the value present at power-down.  
NC  
No Connection  
DEVICE DESCRIPTION  
Serial Interface  
Data Registers  
The X9250 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.  
Each potentiometer has four 8-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.  
The SO and SI pins can be connected together, since  
they have three state outputs. This can help to reduce  
system pin count.  
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.  
Array Description  
The X9250 is comprised of four resistor arrays. Each  
array contains 255 discrete resistive segments that are  
connected in series. The physical ends of each array  
are equivalent to the fixed terminals of a mechanical  
Data Register Detail  
potentiometer (V /R and V /R inputs).  
H
H
L
L
(MSB)  
D7  
(LSB)  
D0  
D6  
D5  
D4  
NV  
D3  
NV  
D2  
NV  
D1  
NV  
At both ends of each array and between each resistor  
segment is a CMOS switch connected to the wiper  
NV  
NV NV  
NV  
(V /R ) output. Within each individual array only one  
W
W
switch may be turned on at a time.  
These switches are controlled by a Wiper Counter  
Register (WCR). The 8 bits of the WCR are decoded  
to select, and enable, one of 256 switches.  
Characteristics subject to change without notice. 3 of 21  
REV 1.1.5 1/31/03  
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