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دیتاشیت - ETC - Supervisor IC indicates fan failure

شماره قطعه A5219
شرح مفصل Supervisor IC indicates fan failure
تولید کننده ETC 
آرم ETC 


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A5219 شرح
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 normal operation. If the tachometer does not
change state within a watchdog timeout period, U1
lights the LED by asserting its reset output. As a
result, the LED pulses on and off as the supervisor
goes through its watchdog/reset cycle. The LED in
this example has a 200ms on-time and flashes with a
period of 1.6s, which is suitable for most purposes.
A similar article appeared in the November, 2003
issue of EET.
+5V
D1 R2
3001
2
3
RES
GND
MR
U1
MAX6316
5
VCC
4
WDI
R1
20k
TACH
Figure 1. The MAX6316 µP supervisor monitors a fan’s tachometer output.
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