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X9258 PDF预览

X9258

更新时间: 2024-01-02 09:18:26
品牌 Logo 应用领域
XICOR 电位器
页数 文件大小 规格书
22页 413K
描述
Quad Digital Controlled Potentiometers (XDCP)

X9258 数据手册

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APPLICATION NOTES  
A V A I L A B L E  
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135  
Low Noise/Low Power/2-Wire Bus/256 Taps  
X9258  
Quad Digital Controlled Potentiometers (XDCP)  
FEATURES  
DESCRIPTION  
• Four potentiometers in one package  
• 256 resistor taps/pot–0.4% resolution  
• 2-wire serial interface  
The X9258 integrates  
potentiometers (XDCP) on a monolithic CMOS  
integrated circuit.  
4
digitally controlled  
• Wiper resistance, 40typical @ V+ = 5V, V- = -5V  
• Four nonvolatile data registers for each pot  
• Nonvolatile storage of wiper position  
• Standby current < 5µA max (total package)  
• Power supplies  
The digitally controlled potentiometer is implemented  
using 255 resistive elements in a series array.  
Between each element are tap points connected to the  
wiper terminal through switches. The position of the  
wiper on the array is controlled by the user through the  
2-wire bus interface. Each potentiometer has  
associated with it a volatile Wiper Counter Register  
(WCR) and 4 nonvolatile Data Registers (DR0:DR3)  
that can be directly written to and read by the user.  
The contents of the WCR controls the position of the  
wiper on the resistor array though the switches. Power  
up recalls the contents of DR0 to the WCR.  
—V  
= 2.7V to 5.5V  
CC  
—V+ = 2.7V to 5.5V  
V- = -2.7V to -5.5V  
• 100K, 50Ktotal pot resistance  
• High reliability  
—Endurance – 100,000 data changes per bit per  
register  
—Register data retention – 100 years  
• 24-lead SOIC, 24-lead TSSOP, 24-lead CSP (Chip  
Scale Package)  
The XDCP can be used as a three-terminal  
potentiometer or as a two-terminal variable resistor in  
a wide variety of applications including control,  
parameter adjustments, and signal processing.  
• Dual supply version of X9259  
BLOCK DIAGRAM  
Pot 0  
V
V
CC  
SS  
R
R
R
R
V /R  
H0 H0  
R
R
R
R
0
2
1
3
0
2
1
3
Wiper  
Counter  
Register  
(WCR)  
Wiper  
Counter  
Register  
(WCR)  
V
/R  
H2 H2  
Resistor  
Array  
Pot 2  
V+  
V-  
V
/R  
L0 L0  
WP  
V
/R  
L2 L2  
V
/R  
SCL  
SDA  
A0  
A1  
A2  
W0 W0  
V
/R  
W2 W2  
Interface  
and  
Control  
8
Circuitry  
V
/R  
A3  
W1 W1  
Data  
V
V
/R  
W3 W3  
R
R
R
R
0
2
1
3
V
/R  
R
R
R
R
H1 H1  
Wiper  
Counter  
Register  
(WCR)  
0
2
1
3
/R  
Wiper  
Counter  
Register  
(WCR)  
Resistor  
Array  
Pot 1  
H3 H3  
Resistor  
Array  
Pot 3  
V
/R  
L1 L1  
V
/R  
L3 L3  
Characteristics subject to change without notice. 1 of 22  
REV 1.1.7 2/4/03  
www.xicor.com  

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