EMC1187 datasheet(16/47 Pages) MICROCHIP

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Triple Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1187

DATASHEET

4.3

Alert Response Address

The ALERT output can be used as a processor interrupt or as an SMBus Alert.

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 4.6.

The EMC1187 will respond to the ARA in the following way:

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_ALL bit to clear the ALERT pin.

APPLICATION NOTE: The ARA does not clear the Status Register and if the MASK_ALL bit is cleared prior to the

Status Register being cleared, the ALERT pin will be reasserted.

Table 4.6 Alert Response Address Protocol

START

ALERT

RESPONSE

ADDRESS

ACK

DEVICE

ADDRESS

NACK

STOP

1 -> 0

0001_100

YYYY_YYY

0 -> 1

EMC1187 Datasheet(PDF) 16 Page - Microchip Technology