TC670 _ BDTIC a Leading Distributor in China

TC670

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 of the TC670. When the minimum fan speed is reached, the ALERT pin 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 90uA (typ) during operation. The space saving package and low power consumption make this device an ideal choice for systems requiring fan speed monitoring. 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. The TC670 is a predictive fan failure detector that asserts a signal whenever the fan's RPM falls below a user-programmable RPM level.

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, 90uA (typ)
VDD Range 3.0V to 5.5V

Parameter

Parameter Name Value	Value
Device Description Predictive Fan Fault Detector	Predictive Fan Fault Detector
Typical Accuracy (°C) N/A	N/A
Predictive Fan Fault yes	yes
Max. Supply Current (µA) 150	150
Max. Accuracy @ 25°C (°C) N/A	N/A
Fan Sense Yes	Yes
High/Low PWM Freq N/A	N/A
Fan Speed Table N/A	N/A
Temp Range (°C) -40 to +85	-40 to +85
Vcc Range (V) +3.0 to +5.5	+3.0 to +5.5

Documents

TC670 Datasheet	Data Sheets	02/05/2013	246KB
Analog & Interface Guide (Volume 2)	Brochures	10/11/2005	1067KB
Quick Guide to Microchip Development Tools	Brochures	10/15/2014	11223KB
Fan Control Function Pack Design Guide	Product Line Documents	08/23/2006	162KB
Fan Management Solutions Product Overview	Product Line Documents	08/23/2006	87KB
Analog & Interface Product Selector Guide	Product Line Card	03/21/2016	4116KB

Ordering Information

Part Number	Leads	Package Type	Temp Range	Packing	1+	26+	100+	1000+	5000+
TC670ECHTR	6	SOT-23	-40C to +85C	T/R	1.32	1.10	1.00	0.97	0.96

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