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

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

unconditionally remain high during shutdown.

3

SHDN

Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors

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

6

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.