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

VOH

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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