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TC670ECH Datasheet

  • TC670ECH

  • Tiny Predictive Fan Failure Detector

  • 12頁(yè)

  • MICROCHIP   MICROCHIP

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TC670
Tiny Predictive Fan Failure Detector
Features
鈥?Fan Wear-out Detection for 2-Wire Linear
Controlled Fans
鈥?Replacement System for 3-Wire Fans
鈥?Fan Alert Signal when Fan Speed is below
Programmed Threshold
鈥?CLEAR Capability for Eliminating False Alarm
鈥?Low Operating Current, 90碌A(chǔ) (typ.)
鈥?V
DD
Range 3.0V to 5.5V
鈥?Available in a 6-Pin SOT-23 Package
General Description
The TC670 is an integrated fan speed sensor that
predicts and/or detects fan failure, preventing thermal
damage to systems with cooling fans. When the fan
speed falls below a user specified level, the TC670
asserts an ALERT signal. With this design, a critical
minimum fan speed is determined by the user. The fan
alert level is then set with a resistor divider on the
THRESHOLD pin (Pin 1) of the TC670. When the
minimum fan speed is reached, the ALERT pin (Pin 5)
changes from a digital HIGH to LOW. This failure
detection works with all linear controlled 2-wire fans.
The TC670 eliminates the need for 3-wire fan solutions.
A
CLEAR
option can be used to reset the ALERT signal,
allowing the flexibility of connecting the ALERT output
of the TC670 with other Alert/FAULT interrupts in the
system. This feature can be implemented so that false
Fan Fault conditions do not initiate system shutdown.
The TC670 is specified to operate over the full
industrial temperature range of -40擄C to +85擄C. The
TC670 is offered in a SOT23-6 pin package and
consumes 90碌A(chǔ) (typ) during operation. The space
saving package and low power consumption make this
device an ideal choice for systems requiring fan speed
monitoring.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Protection for Linear Controlled Fans
Power Supplies
Industrial Equipment
PCs and Notebooks
Data Storage
Data Communications Equipment
Instrumentation
Device Selection Table
Part Number
TC670ECH
Package
6-Pin SOT-23
Temp. Range
-40擄C to +85擄C
Typical Application Circuit
+5V
Package Type
SOT-23A-6
TC670ECH
THRESHOLD
GND
CLEAR
1
2
3
6
5
4
SENSE
ALERT
V
DD
4 V
DD
0.1 碌F
3
From
R
3
Microcontroller
1
ALERT
LED
R
4
CLEAR
ALERT 5
DC
FAN
+12V
R
2
C
SENSE
THRESHOLD
6
SENSE
GND
2
R
SENSE
2002 Microchip Technology Inc.
DS21688B-page 1
漏

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