ISL22424 Datasheet, PDF (15/18 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometer (XDCP™)

ISL22424
Application Example
Figure 22 shows an example of using ISL22424 for gain
setting and offset correction in high side current
measurement application. DCP0 applies a programmable
offset voltage of ±25mV to the FB+ pin of the Instrumentation
Amplifier EL8173 to adjust output offset to zero voltages.
DCP1 programs the gain of the EL8173 from 90 to 110 with
5V output for 10A current through current sense resistor.
More application examples can be found at
http://www.intersil.com/data/an/AN1145.pdf
CS
SCK
MOSI
MISO
µC
DCP0
CS
SCK
SDI
SDO
N DCP IN A CHAIN
DCP1
CS
SCK
SDI
SDO
DCP2
CS
SCK
SDI
SDO
DCP(N-1)
CS
SCK
SDI
SDO
FIGURE 18. DAISY CHAIN CONFIGURATION
CS
SCK
SDI
SDO 0
SDO 1
SDO 2
16 CLKLS
WR D C P2
16 CLKS
WR D C P1
WR D C P2
16 CLKS
WR D C P0
WR D C P1
WR D C P2
FIGURE 19. DAISY CHAIN WRITE SEQUENCE OF N = 3 DCP
CS
SCK
SDI
SDO
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
INSTRUCTION
ADDR
FIGURE 20. TWO BYTE OPERATION
15
DATA IN
DATA OUT
FN6425.0
May 31, 2007