F75386
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).
Remote Temperature High Limit
Monitoring Remote Temperature
F75386 ALERT# pin
Remote High Alert Status
TIME
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).
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F75386
July, 2007
V0.27P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
