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TC652/TC653
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin MSOP)
1
2
3
4
5
6
7
8
DS21453B-page 4
Symbol
V DD
FAULT
SHDN
GND
SENSE
T OVER
GND
PWM
Description
Power Supply Input. May be independent of fan power supply.
Fan Fault Alert, Active-Low Output. FAULT goes low to indicate a fan FAULT condition.
When FAULT occurs, the device is latched in Shutdown mode with PWM low. Toggling
the SHDN pin or cycling the V DD will release the part and fan from shutdown. FAULT will
unconditionally remain high during shutdown.
Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors
temperature and T OVER is low if temperature rises above factory set point.
Ground return for all TC652/TC653 functions.
Detect Fan Pulses Input. Pulses are detected at this pin as fan rotation chops the current
through the sense resistor, R SENSE . The absence of pulses indicates a Fan Fault.
Over-Temperature Alert, Active-Low Output.
Ground.
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
Frequency is 15Hz.
2002 Microchip Technology Inc.
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