W83L771W Datasheet, PDF (11/25 Pages) Winbond – H/W Monitoring IC

W83L771W/G
High Limit
Measured Tmperature By
W83L771W
ALERT mask set in response to
reading of status register by
master
W83L771WALERT Pin
End of Temperature conversion
W83L771W High Limit Status
Fig. 7.3.2 Response of ALERT output interrupt mode
7.3.3 ^ALERT Output SMBus ALERT Mode
Fig. 7.3.3 shows the mechanism of ALERT output SMBus ALERT mode. Under this mode, the
ALERT output of W83L771W/G is connected to SMBus alert line which has more than one device
connected to it. By using such implementation, SMBus ALERT protocol can assist the master in
resolving which slave generates an interrupt. When measured temperature exceeds the limitation, the
ALERT pin is pulled low and the corresponding alert flags in Status Register high. If there is no read
command for Status Register and the ALERT mask bit will just be set when SMBus ALERT Response
Address (ARA) occurs from master (Alert Response Address is 0001100) and W83L771W/G will
generate itself address to master. If the temperature never exceeds the limitation, the latched ALERT
pin can release by reset ALERT mask bit and the latched corresponding alert flags in Status Register
can release by reading command for Status Register.
Publication Release Date: March 31, 2006
-7-
Revision 0.7