ADM9240
AP P LICATIO N CIRCUIT
Figure 14 shows a generic application circuit using the
AD9240. T he analog monitoring inputs are connected to the
power supplies including two processor core voltage inputs. T he
VID inputs are connected to the processor voltage ID pins.
T here are two tacho inputs from fans, and the analog output is
used to control the speed of a third fan. A chassis intrusion
latch with an opto-sensor is connected to the CI input. Of
course, in an actual application, every input and output may not
be used, in which case unused analog and digital inputs should
be tied to analog or digital ground as appropriate.
+3.3V
+12V
VID0
VID1
VID2
VID3
NTEST_OUT/A0
A1
+3.3V
FROM VID PINS
OF PROCESSOR
SDA
SERIAL BUS
SCL
1N914
1N914
FAN1
FAN2
+3.3V
VID4
CMOS
BACKUP
BATTERY
MRD901
74HC132
510⍀
+V
CCP1
100k⍀
510⍀
510⍀
CI
ADM9240
+2.5V
+3.3V
470k⍀
IN
GNDD
IN
10k⍀
10F 0.1F
+
510⍀
510⍀
510⍀
+5V
IN
+3.3V
V
CC
INT
+12V
IN
+12V
NTEST_IN/AOUT
+V
CCP2
2N2219A
OP295
82k⍀
GNDA
RESET
10k⍀
Figure 14. Application Circuit
REV. 0
–17–
ADI [ ADI ]
