Datasheet

DC FAN SENSOR
Functions of DC Fan Sensor
If the fan stops as a result of forced external restraint, a signal
will be generated to indicate that there is a problem. This signal
can be used to control an external warning circuit in order to help
prevent the device from overheating.
Although there are various detection methods for this sensor, we
employ the method that uses a logic circuit.
1. Lock sensor specifications
Output waveform
* Output may be high for approximately 0.5 seconds when power is turned
on.
* The continually high output waveform type when fan is stopped (locked)
is standard.
A high/low output waveform type and output waveform type that
corresponds to the rotation frequency during fan rotation are available
by special order.
Please inquire for details.
2. Sensor output circuit
Notes: 1. Set the resistance value (R) so that the sensor circuit current
(Ic) does not exceed 5 mA.
2. When using at TTL level, the sensor circuit current (Ic) should
be approximately 2 mA.
* Exceeding the values above may lead to IC damage.
Approx. 5 sec. or less
Fan rotating Fan stopped
(locked)
Fan rotating
Approx. 5 sec. or less
V
OH
VOL
0V
s
Vcc
Ic R
Rating of sensor
• Sensor output:
• Vcc:
• Ic:
Open collector output
Max. 30 V
Max. 5 mA
Sensor output
Power
supply
Power
supply
Red
White
Black
02/2006
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