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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC670 Datasheet

Tiny Predictive Fan Failure Detector

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TC670
Tiny Predictive Fan Failure Detector
Features
• Fan Wear-out Detection for 2-Wire Linear
Controlled Fans
• Replacement System for 3-Wire Fans
• Fan Alert Signal when Fan Speed is below
Programmed Threshold
• CLEAR Capability for Eliminating False Alarm
• Low Operating Current, 90µA (typ.)
• VDD Range 3.0V to 5.5V
• Available in a 6-Pin SOT-23 Package
Applications
• Protection for Linear Controlled Fans
• Power Supplies
• Industrial Equipment
• PCs and Notebooks
• Data Storage
• Data Communications Equipment
• Instrumentation
Device Selection Table
Part Number Package
TC670ECH 6-Pin SOT-23
Temp. Range
-40°C to +85°C
Package Type
SOT-23A-6
THRESHOLD 1
GND 2
CLEAR 3
6 SENSE
5 ALERT
4 VDD
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°C to +85°C. The
TC670 is offered in a SOT23-6 pin package and
consumes 90µA (typ) during operation. The space
saving package and low power consumption make this
device an ideal choice for systems requiring fan speed
monitoring.
Typical Application Circuit
+5V
4 VDD
ALERT
LED
0.1 µF
3 CLEAR
From
R3
Microcontroller
ALERT 5
R4
+12V
DC
1
THRESHOLD
SENSE 6
CSENSE
FAN
R2
GND
RSENSE
2
© 2002 Microchip Technology Inc.
DS21688B-page 1
Free Datasheet http://www.datasheet4u.com/


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC670 Datasheet

Tiny Predictive Fan Failure Detector

No Preview Available !

TC670
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
VDD...................................................................................6.0V
All inputs and outputs w.r.t. ..... (GND 0.3V) to (VDD + 0.3V)
Difference Input voltage ...................................... IVDD - GND
Output Short Circuit Current ..................................continuous
Current at Input Pin ................................................... +/-2 mA
Current at Output Pin .............................................. +/-25 mA
Junction Temperature, TJ ............................................. 150°C
ESD protection on all pins ..................................................≥ 4 kV
Operating Temperature Range........................-40°C to +85°C
Storage Temperature Range .........................-55°C to +150°C
Stresses above those listed under “Absolute Maximum Rat-
ings” may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
TC670 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, all limits are specified at +25°C, VDD = 3.0V to 5.5V, CLEAR = Low.
Boldface type specifications apply for temperature range of -40°C to +85°C
Symbol
Parameters
Min Typ Max
Unit
Conditions
Power Supply:
VDD Supply Voltage
IDD Supply Current
CLEAR Input:
3.0 — 5.5
— 90 150
V
µA
VIH CLEAR Logic Input High Level
VIL CLEAR Logic Input Low Level
SENSE Input:
0.8VDD
— — 0.2VDD
V
V
VTH(SENSE) SENSE Input Level Threshold Voltage
RSENSE
SENSE Input Resistance
THRESHOLD Input:
— 124 —
— 50 —
mV
k
THRESHOLD Input Voltage Minimum
— 0.0 —
V
THRESHOLD Input Voltage Maximum
— 2.4 —
V
THRESHOLD Input Resistance
ALERTACC Programmed Fan Speed Alert Accuracy (1)
ALERT Output:
— 100 —
-10 — +10
M
% VDD = 3.0V
VLOW
tDELAY
Note 1:
ALERT Output Low Voltage
ALERT Output Delay Time
— — 0.3
— 176 —
V ISINK = 2.5 mA
ms
The TC670 will operate properly over the entire power supply range of 3.0V to 5.5V. As VDD varies from 3.0V, accuracy will degrade
based on the percentage of VDD as shown in Section 3.0.
TEMPERATURE SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, all limits are specified for -40°C to +85°C and VDD = 3.0V to 5.5V
Symbol
Parameters
Min Typ Max
Unit
Conditions
Temperature Ranges:
TA Specified Temperature Range
TA Operating Temperature Range
Thermal Package Resistances:
θJA Thermal Resistance, 6L-SOT-23
-40 — +85
-40 — +85
°C
°C
— 230 —
°C/W
DS21688B-page 2
© 2002 Microchip Technology Inc.
Free Datasheet http://www.datasheet4u.com/


Part Number TC670
Description Tiny Predictive Fan Failure Detector
Maker Microchip
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