F75386

F75386

V0.27P

-7-

6.4

Alert# Signal

ALERT#/FANIN (pin 6) can be used as ALERT# output or fan tachometer input by setting Configuration Register (index

03h). When pin 6 is used as ALERT# output, there are three different alert functions can be used. The interrupt methods that

ALERT# pin can act are (1) Comparator mode (2) Interrupt mode (3) Alert Response Address mode.

6.4.1 Comparator mode

When the Comparator Mode bit in Configuration Register (index BFh) is asserted, ALERT# is used as a temperature

comparator. If the triggering conditions occur, ALERT# will go to low and relative alert status will be asserted until those

conditions are no longer present. This mode is not the power-on default state. Note that the triggering conditions do not

include BUSY and OPEN status in Configuration Register (index 02h).

6.4.2 Interrupt mode

The F75386’s ALERT# output can be used as a simple interrupt signal if Comparator Mode bit is not asserted. If the

triggering conditions occur, relative alert status will be asserted and ALERT# will go to low. The F75386 will set the ALERT

Mask bit and relative alert status will be cleared after master’s reading of the Status Register (Index 02h or 18h). The ALERT

Mask bit is set in order to prevent further ALERT# triggering after the end of one temperature conversion if the triggering

conditions are still present. At the end of interrupt service routine, the master has to reset ALERT Mask bit in configuration

register. Note that the triggering conditions do not include BUSY and OPEN status in Configuration Register (index 02h).

Monitoring Remote Temperature

Remote Temperature High Limit

F75386 ALERT# pin

Remote High Alert Status

TIME