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ADM1030ARQ View Datasheet(PDF) - ON Semiconductor

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ADM1030ARQ Datasheet PDF : 29 Pages
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ADM1030
The INT pin will continue to generate interrupts after the asser-
tion of FAN_FAULT since tach measurement continues even
after fan failure. Should the fan recover from its failure condi-
tion, the FAN_FAULT signal will be negated, and the fan will
return to its normal operating speed.
Figure 23 shows a typical application circuit for the ADM1030.
Temperature monitoring can be based around a CPU diode or
discrete transistor measuring thermal hotspots. Either 2- or
3-wire fans may be monitored by the ADM1030, as shown.
PWM_OUT
2 SECS
TACH/AIN
INT
FAN_FAULT
2 SECS
2 SECS
FULL SPEED
3RD TACH
FAILURE
4TH TACH
FAILURE
STATUS REG READ TO
CLEAR INTERRUPT
5TH TACH
FAILURE
Figure 22. Operation of FAN_FAULT and Interrupt Pins
CONTINUING
TACH FAILURE
3.3V
5V
10k
TYP.
TACH
FAN1
3-WIRE
FAN
3.3V
3.3V 3.3V
2.2k
TYP.
2.2k
TYP.
SCL
NDT3055L
THERM
SIGNAL TO
THROTTLE
CPU CLOCK
FAN_FAULT
TO SIGNAL
FAN FAILURE
CONDITION
3.3V
10k
3.3V
10k
10k
TYP.
PWM_OUT1
1
TACH1/AIN1
2
NC 3
NC 4
GND
5
3.3V
VCC 6
THERM
7
FAN_FAULT
8
ADM1030
SCL
16
SDA
15
INT (SMBALERT)
14
ADD
13
12 NC
11 NC
D+
10
9 D-
3.3V
10k
TYP.
SDA
CPU INTERRUPT
2N3904 OR PENTIUM III
CPU THERMAL DIODE
NC = NO CONNECT
Figure 23. Typical Application Circuit
Rev. 2 | Page 22 of 29 | www.onsemi.com
–22–
REV. A
 

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