TC653 Microchip Technology Inc., TC653 Datasheet - Page 4

• Manufacturer Part Number: TC653
• Description: Integrated Temperature Sensor & Brushless Dc Fan Controller With Fansense Detect & Over-temperature
• Manufacturer: Microchip Technology Inc.

TC652/TC653
2.0
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
DS21453B-page 4
(8-Pin MSOP)
Pin No.
1
2
3
4
5
6
7
8
PIN DESCRIPTIONS
Symbol
SENSE
PIN FUNCTION TABLE
FAULT
SHDN
T
PWM
GND
GND
V
OVER
DD
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
unconditionally remain high during shutdown.
Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors
temperature and T
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
Over-Temperature Alert, Active-Low Output.
Ground.
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
Frequency is 15Hz.
OVER
is low if temperature rises above factory set point.
SENSE
DD
will release the part and fan from shutdown. FAULT will
. The absence of pulses indicates a Fan Fault.
Description
©
2002 Microchip Technology Inc.