Datasheet

TC652/TC653
DS21452C-page 4  2002-2012 Microchip Technology Inc.
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)
Symbol Description
1V
DD
Power Supply Input. May be independent of fan power supply.
2FAULT
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.
3 SHDN
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.
4 GND Ground return for all TC652/TC653 functions.
5 SENSE 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.
6 T
OVER
Over-Temperature Alert, Active-Low Output.
7 GND Ground.
8 PWM PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
Frequency is 15Hz.