isl22444 Intersil Corporation, isl22444 Datasheet - Page 16

• Manufacturer Part Number: isl22444
• Description: Quad Digitally Controlled Potentiometer Xdcp? , Low Noise, Low Power, Spi? Bus, 256 Taps
• Manufacturer: Intersil Corporation

ISL22444
CS
SCK
16 CLKS
16 CLKS
16 CLKS
16 CLKS
16 CLKS
16 CLKS
NOP
SDI
NOP
NOP
RD DCP0
RD DCP2
RD DCP1
DCP2 OUT
DCP1 OUT
DCP0 OUT
SDO
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