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.
●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
●• 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