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PDF ( 数据手册 , 数据表 ) ISL22444

零件编号 ISL22444
描述 Quad Digitally Controlled Potentiometer
制造商 Intersil
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ISL22444 数据手册, 描述, 功能
NOT RECOMMENDED FOR NEW DESIGNS
RECOMMENDED REPLACEMENT PART
ISL22424
ISL22444
Quad Digitally Controlled Potentiometer (XDCP™)
Data Sheet
May 24, 2007
FN6426.0
Low Noise, Low Power, SPI® Bus, 256 Taps
The ISL22444 integrates four digitally controlled
potentiometers (DCP), control logic and non-volatile memory
on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are implemented with
a combination of resistor elements and CMOS switches. The
wipers position is controlled by the user through the SPI
serial interface. Each potentiometer has an associated
volatile Wiper Register (WRi) and a non-volatile Initial Value
Register (IVRi) that can be directly written to and read by the
user. The contents of the WRi control the position of the
wiper. At power-up the device recalls the contents of the
DCP’s IVRi to the corresponding WRi.
The ISL22444 also has 11 General Purpose non-volatile
registers that can be used as storage of lookup table for
multiple wiper position or any other valuable information.
The ISL22444 features a dual supply that is beneficial for
applications requiring a bipolar range for DCP terminals
between V- and VCC.
Each DCP can be used as three-terminal potentiometer or
as two-terminal variable resistor in a wide variety of
applications including control, parameter adjustments, and
signal processing.
Features
• Four potentiometers in one package
• 256 resistor taps
• SPI serial interface with write/read capability
• Daisy Chain Configuration
• Shutdown mode
• Non-volatile EEPROM storage of wiper position
• 11 General Purpose non-volatile registers
• High reliability
- Endurance: 1,000,000 data changes per bit per register
- Register data retention: 50 years @ T 55°C
• Wiper resistance: 70typical @ 1mA
• Standby current <4µA max
• Shutdown current <4µA max
• Dual power supply
- VCC = 2.25V to 5.5V
- V- = -2.25V to -5.5V
• 10k 50kor 100ktotal resistance
• Extended industrial temperature range: -40 to +125°C
• 20 Ld TSSOP or 20 Ld QFN
• Pb-free plus anneal product (RoHS compliant)
Ordering Information
PART NUMBER
(Notes 1, 2)
ISL22444TFV20Z
PART MARKING
22444 TFVZ
RESISTANCE
OPTION (k)
100
TEMPERATURE
RANGE (°C)
-40 to +125
PACKAGE
(Pb-free)
20 Ld TSSOP
PKG. DWG. #
M20.173
ISL22444TFR20Z
22444 TFRZ
100
-40 to +125
20 Ld QFN
L20.5x5
ISL22444UFV20Z
22444 UFVZ
50
-40 to +125
20 Ld TSSOP
M20.173
ISL22444UFR20Z
22444 UFRZ
50
-40 to +125
20 Ld QFN
L20.5x5
ISL22444WFV20Z
22444 WFVZ
10
-40 to +125
20 Ld TSSOP
M20.173
ISL22444WFR20Z
22444 WFRZ
10
-40 to +125
20 Ld QFN
L20.5x5
NOTES:
1. Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
2. Add “-TK” suffix for 1,000 Tape and Reel option
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) and XDCP are registered trademarks of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.







ISL22444 pdf, 数据表
DCP Macro Model
RTOTAL
RH RL
CL
CH CW 10pF
10pF
25pF
RW
Timing Diagrams
Input Timing
CS
SCK
SDI
tLEAD
tSU
MSB
tH
SDO
HIGH IMPEDANCE
Output Timing
tWL
CS
SCK
SDO
tSO
SDI ADDR
MSB
tV
XDCP Timing (for All Load Instructions)
CS
SCK
SDI MSB
VW
SDO
HIGH IMPEDANCE
8
ISL22444
tCYC
...
tWH
...
tFI
...
tHO
...
...
...
tCS
LSB
tRI
tLAG
LSB
tDIS
LSB
tWRT
FN6426.0
May 24, 2007







ISL22444 equivalent, schematic
ISL22444
CS
SCK
SDI
SDO
16 CLKS
RD DCP2
16 CLKS
RD DCP1
16 CLKS
RD DCP0
16 CLKS
NOP
16 CLKS
NOP
16 CLKS
NOP
DCP2 OUT
DCP1 OUT
DCP0 OUT
FIGURE 21. DAISY CHAIN READ SEQUENCE OF N = 3 DCP
Application Example
Figure 22 shows an example of using ISL22444 for gain
setting and offset correction in a high side current
measurement application. DCP0 applies a programmable
offset voltage of ±25mV to the FB+ pin of the Instrumentation
Amplifier ISL28272 to adjust output offset to zero voltages.
DCP1 programs the gain of the ISL28272 from 90 to 110
with 5V output for 10A current through current sense
resistor. DCP2 and DCP3 are used for another channel of
dual ISL28272 correspondently (not shown in Figure 22).
More application examples can be found at
http://www.intersil.com/data/an/AN1145.pdf
16 FN6426.0
May 24, 2007










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