RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
5.2.7
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_100b. All devices with active interrupts will respond with their slave
address as shown in Table 5.9.
Table 5.9 Alert Response Address Protocol
ALERT
RESPONSE
ADDRESS
DEVICE
ADDRESS
START
RD
ACK
NACK
STOP
1 -> 0
0001_100
1
0
YYYY_YYY
1
0 -> 1
The EMC2113 slave interface 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 EMC2113
Revision 1.2 (10-08-09)
DATA2S1HEET
SMSC [ SMSC CORPORATION ]
