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PDF ( 数据手册 , 数据表 ) X9271

零件编号 X9271
描述 Single Digitally Controlled Potentiometer
制造商 Intersil
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X9271 数据手册, 描述, 功能
Data Sheet
X9271
Single Supply/Low Power/256-Tap/SPI Bus
July 18, 2014
FN8174.4
Single, Digitally Controlled (XDCP™)
Potentiometer
The X9271 integrates a single, digitally controlled
potentiometer (XDCP™) on a monolithic CMOS integrated
circuit.
The digitally controlled potentiometer is implemented by
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 SPI bus interface. The
potentiometer has associated with it a volatile Wiper Counter
Register (WCR) and four nonvolatile data registers that can
be directly written to and read by the user. The contents of
the WCR control the position of the wiper on the resistor
array though the switches. Power-up recalls the contents of
the default data register (DR0) to the WCR.
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.
Features
• 256 Resistor Taps
• SPI Serial Interface for Write, Read, and Transfer
Operations of Potentiometer
• Wiper Resistance, 100Ω typical at VCC = 5V
• 16 Nonvolatile Data Registers
• Nonvolatile Storage of Multiple Wiper Positions
• Power-on Recall; Loads Saved Wiper Position on
Power-up
• Standby Current <3µA Max
• VCC = 2.7V to 5.5V Operation
• 50kΩ End-to-End Resistance
• 100-yr Data Retention
• Endurance: 100,000 Data Changes per Bit per Register
• 14-Lead TSSOP
• Low-power CMOS
• Pb-Free Plus Anneal Available (RoHS Compliant)
Functional Diagram
VCC
SPI
BUS
INTERFACE
ADDRESS
DATA
STATUS
WRITE
READ
TRANSFER
INC/DEC
BUS
INTERFACE
AND CONTROL
CONTROL
POWER-ON RECALL
WIPER COUNTER
REGISTER (WCR)
DATA REGISTERS
16 Bytes
RH
50kΩ
256 TAPS
POT
VSS
RW RL
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2005, 2011, 2014. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.







X9271 pdf, 数据表
X9271
CS
SCL
SI 0 1 0 1 0 0
ID3 ID2 ID1 ID0 0 0 A1 A0
Device ID
Internal
Address
I3 I2 I1 I0 RB RA P1 P0
XXXXX XXX
Don’t Care
Instruction
Opcode
Register Pot/Bank
Address Address
S0
D7 D6 D5 D4 D3 D2 D1 D0
WCR[7:0] valid only when P1 = P0 = 0;
or
Data Register Bit [7:0] for all values of P1 and P0
FIGURE 3. THREE-BYTE INSTRUCTION SEQUENCE (READ)
CS
SCK
SI
0 1 0 10
ID3 ID2 ID1 ID0 0
0
0 A1 A0
I3 I2
I1 I0
00
RB RA P1 P0
Device ID
Internal
Address
Instruction
Opcode
Register Pot/Bank
Address Address
These commands only valid when P1 = P0 = 0
FIGURE 4. TWO-BYTE INSTRUCTION SEQUENCE
CS
SCL
SI 0 1 0 1 0 0
ID3 ID2 ID1 ID0 0 0 A1 A0
Device ID
Internal
Address
00
I3 I2 I1 I0
Instruction
Opcode
RA RB P1 P0
Register Pot/Bank
Address Address
I
N
C
1
I
N
C
2
ID
N
C
E
C
n1
FIGURE 5. INCREMENT/DECREMENT INSTRUCTION SEQUENCE
D
E
C
n
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8
FN8174.4
July 18, 2014







X9271 equivalent, schematic
X9271
Applications information
Basic Configurations of Electronic Potentiometers
VR
RW
+VR
3-terminal Potentiometer;
Variable Voltage Divider
Application Circuits
VS +
VO
R2
R1
VO = (1+R2/R1)VS
FIGURE 7. NONINVERTING AMPLIFIER
R1
VS
100kΩ
10kΩ
R2
+
TL072
10kΩ
10kΩ
+12V
-12V
VO
FIGURE 9. OFFSET VOLTAGE ADJUSTMENT
I
2-terminal Variable Resistor;
Variable Current
VIN 317
VO (REG)
R1
Iadj
R2
VO (REG) = 1.25V (1+R2/R1)+Iadj
FIGURE 8. VOLTAGE REGULATOR
VS
+
VO
R1 R2
VUL = {R1/(R1+R2)} VO(max)
RLL = {R1/(R1+R2)} VO(min)
FIGURE 10. COMPARATOR WITH HYSTERESIS
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FN8174.4
July 18, 2014










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