A5219 Datasheet (ETC) - Supervisor IC indicates fan failure

A5219, Supervisor IC indicates fan failure

DESIGN SHOWCASE Supervisor IC indicates fan failure The brushless DC fans found in many types of equipment can be crucial to the performance and longevity of that equipment.

A quick indication of fan failure, moreover, can be essential in preventing major damage.

Among the many approaches for identifying and indicating stalled fans, the circuit of Figure 1 is very simple and reliable.

The fan’s tachometer output connects to the watchdog input of a µP supervisor (U1).

The LED remains off during n