MAX6643 查看數據表（PDF） - Maxim Integrated
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MAX6643 Datasheet PDF : 17 Pages
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Automatic PWM Fan-Speed Controllers with
Overtemperature Output
FULLSPD/(FULLSPD)
Block Diagram
DXP1/(DXP)
DXP2
TEMPERATURE
TEMPERATURE
SENSOR
LOGIC
DUTY CYCLE
PWM
GENERATOR
PWM_OUT
() ARE FOR MAX6643 ONLY.
MAX6643
MAX6644
MAX6645
OT TH TL
THRESHOLD
SELECTION
OT1 OT2 TH1 TH2 TL1 TL2
VDD (+3.0V TO +5.5V)
FAN-FAIL
DETECTION
ANALOG SENSE
TACHOMETER
LOCKED ROTOR IN
ANALOG SENSE
TACHOMETER
LOCKED ROTOR IN
FAN_IN1
FAN_IN2
TACHSET FANFAIL
Typical Operating Circuit
+VFAN (5V OR 12V)
4.7kΩ
TO FANFAIL
ALARM
1
TH1
2
TL2
3 TL1
4 FANFAIL
5 TACHSET
6 FULLSPD
7 GND
8 DXP
MAX6643
16
VDD
15
TH2
14
OT1
13
OT2
4.7kΩ
12
PWM_OUT
FAN_IN1 11 (TACHOMETER MODE)
FAN_IN2 10 (TACHOMETER MODE)
OT 9
4.7kΩ
N
TO OVERTEMPERATURE ALARM
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