adm9240 Analog Devices, Inc., adm9240 Datasheet - Page 17

• Manufacturer Part Number: adm9240
• Description: Low Cost Microprocessor System Hardware Monitor
• Manufacturer: Analog Devices, Inc.

REV. 0
APPLICATION CIRCUIT
Figure 14 shows a generic application circuit using the
AD9240. The analog monitoring inputs are connected to the
power supplies including two processor core voltage inputs. The
VID inputs are connected to the processor voltage ID pins.
There 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.
BATTERY
BACKUP
CMOS
MRD901
1N914
470k
2N2219A
+12V
+12V
74HC132
82k
OP295
10k
+3.3V
+3.3V
100k
Figure 14. Application Circuit
1N914
10k
+3.3V
+3.3V
–17–
RESET
SERIAL BUS
SDA
SCL
NTEST_IN/AOUT
NTEST_OUT/A0
10 F 0.1 F
+
GNDD
FAN1
FAN2
INT
V
A1
CC
CI
ADM9240
GNDA
510
510
510
510
510
510
VID0
VID1
VID2
VID3
VID4
ADM9240
FROM VID PINS
OF PROCESSOR
+5V
+12V
+V
+2.5V
+3.3V
+V
CCP1
CCP2
IN
IN
IN
IN