ADM1030ARQ-REEL7 ON Semiconductor, ADM1030ARQ-REEL7 Datasheet - Page 22

• Manufacturer Part Number: ADM1030ARQ-REEL7
• Description: IC SNSR TEMP/FAN PWM CTRL 16QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1030ARQ-REEL7

• Rohs Status: RoHS non-compliant
• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 100°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP

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.
FAN_FAULT
PWM_OUT
TACH/AIN
INT
FAN FAILURE
CPU CLOCK
FAN_FAULT
CONDITION
2 SECS
SIGNAL TO
TO SIGNAL
THROTTLE
10k�
TACH
TYP.
THERM
3.3V
NDT3055L
5V
3.3V
3.3V
3RD TACH
10k�
10k�
FAILURE
Figure 22. Operation of FAN_FAULT and Interrupt Pins
FAN1
3-WIRE
FAN
3.3V
10k�
TYP.
TACH1/AIN1
FAN_FAULT
PWM_OUT1
Figure 23. Typical Application Circuit
3.3V
THERM
GND
Rev. 2 | Page 22 of 29 | www.onsemi.com
V
NC
NC
2 SECS
CC
1
2
3
4
5
6
7
8
ADM1030
STATUS REG READ TO
CLEAR INTERRUPT
–22–
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.
16
15
14
13
12
11
10
9
SCL
ADD
SDA
INT (SMBALERT)
NC
NC
D+
D-
2.2k�
TYP.
4TH TACH
FAILURE
3.3V
3.3V
2.2k�
TYP.
3.3V
NC = NO CONNECT
10k�
TYP.
2 SECS
2N3904 OR PENTIUM III
CPU THERMAL DIODE
5TH TACH
FAILURE
SCL
SDA
CPU INTERRUPT
TACH FAILURE
CONTINUING
FULL SPEED
REV. A