EMC1702 Datasheet, PDF (19/57 Pages) SMSC Corporation – High-Side Current-Sense and Dual 1°C Temperature Monitor

High-Side Current-Sense and Dual 1°C Temperature Monitor
Datasheet
3.2.7 Alert Response Address
The ALERT output can be used as a processor interrupt or as an SMBus Alert when configured to
operate as an interrupt.
When it detects that the ALERT pin is asserted, the host will send the Alert Response Address (ARA)
to the general address of 0001_100xb. All devices with active interrupts will respond with their client
address, as shown in Table 3.9.
Table 3.9 Alert Response Address Protocol
START
1 -> 0
ALERT
RESPONSE
ADDRESS
0001_100
DEVICE
RD
ACK
ADDRESS
NACK
STOP
1
0
YYYY_YYY
1
0 -> 1
The EMC1702 will respond to the ARA in the following way if the ALERT pin is asserted.
1. Send Slave Address and verify that full slave address was sent (i.e. the SMBus communication
from the device was not prematurely stopped due to a bus contention event).
2. Set the MASK bit to clear the ALERT pin.
SMSC EMC1702
19
DATASHEET
Revision 1.2 (09-27-10)