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TC670 Scheda tecnica(PDF) 1 Page - Microchip Technology |
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TC670 Scheda tecnica(HTML) 1 Page - Microchip Technology |
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1 / 12 page  © 2002 Microchip Technology Inc. DS21688B-page 1 TC670 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, 90 µA(typ.) •VDD Range 3.0V to 5.5V • Availableina6-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 Package Type 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 90 µA (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 Part Number Package Temp. Range TC670ECH 6-Pin SOT-23 -40°C to +85°C 25 SOT-23A-6 THRESHOLD GND CLEAR SENSE ALERT VDD 1 3 6 4 From 5 6 CSENSE R4 RSENSE +12V ALERT LED DC FAN DC FAN SENSE ALERT 2 4 3 1 +5V R3 R2 0.1 µF VDD CLEAR THRESHOLD GND Microcontroller Tiny Predictive Fan Failure Detector |
Codice articolo simile - TC670 |
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Descrizione simile - TC670 |
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