W83L771ASG Datasheet, PDF (12/28 Pages) Nuvotem Talema – W83L771AWG W83L771ASG Nuvoton H/W Monitoring IC

W83L771AWG/W83L771ASG
7.3.3 ALERT Output SMBusTM ALERT Mode
Fig. 7.3.3 shows the mechanism of the ALERT output SMBus^TM ALERT mode. In this mode, the
ALERT output of the W83L771AWG/ASG is connected to the SMBus^TM alert line which has more
than one device connected to it. Through such an implementation, SMBus^TM ALERT mode can assist
the master in resolving which slave generates an interrupt. When the measured temperature falls
outside of the allowed range, the ALERT pin will be pulled low and the corresponding alert flags in
Status Register will be pulled high. The ALERT mask bit will just be set if there is a read command for
Status Register or when SMBus^TM ALERT Response Address (ARA) occurs from master (Alert
Response Address is 0001100). Meanwhile, the W83L771AWG/ASG will generate and return its own
address to the master. If the temperature never falls outside of the allowed range, the latched ALERT
pin can release by the reset ALERT mask bit and the latched corresponding alert flags in Status
Register can release by reading command for Status Register. Please also refer to the
W83L771AWG_773G_775G Application Note 3.pdf for implementation.
High Limit
Measured Temperature By
W83L771AWG/ASG
ALERT mask set in response to
Alert Response Address from
master
W83L771AWG/ASG ALERT Pin
End of Temperature conversion
W83L771AWG/ASG High
Limit Status
Fig. 7.3.3 Response of ALERT output SMBus alert mode
Publication Release Date: 2009/11/19
Version: 1.91
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