EMC1428 datasheet(13/53 Pages) MICROCHIP

13 / 53 page

1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones

Data Sheet

 2014 Microchip Technology Inc.

DS20005275A-page 13

3.3

Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3.3.

3.4

Send Byte

The Send Byte protocol is used to set the internal address register pointer to the correct address

location. No data is transferred during the Send Byte protocol as shown in Table 3.4.

3.5

Receive Byte

The Receive Byte protocol is used to read data from a register when the internal register address

pointer is known to be at the right location (e.g. set via Send Byte). This is used for consecutive reads

of the same register as shown in Table 3.5.

3.6

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 000_1100b. All devices with active interrupts will respond with their client

address as shown in Table 3.6.

Table 3.3 Read Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

START

SLAVE

ADDRESS

ACK

DATA

NACK

STOP

1-> 0

1001_100

XXh

0 -> 1

1001_100

XXh

0 -> 1

Table 3.4 Send Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

STOP

1 -> 0

1001_100

XXh

1 -> 0

Table 3.5 Receive Byte Protocol

START

SLAVE

ADDRESS

ACK

NACK

STOP

1 -> 0

1001_100

XXh

1 -> 0

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