EMC1702 datasheet(18/60 Pages) MICROCHIP

18 / 60 page

EMC1702

DS20006455A



2020 Microchip Technology Inc.

3.2

SMBus Protocols

The EMC1702 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Receive Byte, Write

Byte, Block Read, and Block Write as valid protocols. It will respond to the Alert Response Address

protocol but is not in full compliance.

All of the protocols listed below use the convention in Table 3.2.

3.2.1

Write Byte

The Write Byte is used to write one byte of data to the registers, as shown in Table 3.3:

3.2.2

Read Byte

The Read Byte protocol is used to read one byte of data from the registers, as shown in Table 3.4.

3.2.3

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 3.5.

Table 3.2 Protocol Format

DATA SENT

TO DEVICE

DATA SENT TO

THE HOST

# of bits sent

Table 3.3 Write Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

STOP

1 -> 0

YYYY_YYY

XXh

0 -> 1

Table 3.4 Read Byte Protocol

START

SLAVE

ADDRESS

ACK

Address

ACK

START

Slave

Address

ACK

Data

NACK

STOP

1 -> 0

YYYY_YYY

XXh

0 -> 1

YYYY_YYY

XXh

0 -> 1

Table 3.5 Send Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

STOP

1 -> 0

YYYY_YYY

XXh

0 -> 1

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