EMC1001_15 datasheet(7/24 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005411A-page 7

EMC1001

3.3

SMBus Send Byte

The Send Byte protocol is used to set the Internal

Address Register to the correct Address. The Send

Byte can be followed by the Receive Byte protocol

(Section 3.4 “SMBus Receive Byte”) in order to read

data from the register. The send byte protocol cannot

be used to write data; if data is to be written to a regis-

ter, then the Write Byte protocol must be used (see

Section 3.1 “SMBus Write Byte”). The Send Byte

protocol is shown in Table 3-4.

3.4

SMBus Receive Byte

The Receive Byte protocol is used to read data from a

known to be at the right location (e.g., set via Send

Byte). This is used for consecutive reads of the same

3.5

Alert Response Address

The ALERT/THERM2 output can be used as an

SMBALERT#

described

Section 4.3

“ALERT/THERM2

Output”

The

Alert

Response

Address is polled by the Host whenever it detects an

SMBALERT#, i.e. when the ALERT/THERM2 pin is

asserted. The EMC1001 will acknowledge the Alert

Response Address and respond with its device

address as shown in Table 3-6.

3.6

SMBus Addresses

The EMC1001 is available in two versions (EMC1001

and EMC1001-1), each of which has four 7-bit slave

addresses that are enabled based on the pull-up resis-

tor on the ADDR/THERM pin. The value of this pull-up

resistor determines the slave address per Table 1-1.

Attempting to communicate with the EMC1001 SMBus

interface with an invalid slave address or invalid proto-

col results in no response from the device and does not

affect its register contents.

The EMC1001 supports stretching of the SMCLK

signal by other devices on the SMBus but will not

perform this operation itself. The EMC1001 has an

SMBus timeout feature. Bit 7 of the SMBus Timeout

Enable register enables this function when set to 1 (the

default setting is 0). When this feature is enabled, the

SMBus will timeout after approximately 25 ms of

inactivity.

TABLE 3-4:

SEND BYTE PROTOCOL

START

Slave Address

ACK

Address

ACK

STOP

TABLE 3-5:

RECEIVE BYTE PROTOCOL

START

Slave Address

ACK

NACK

STOP

TABLE 3-6:

MODIFIED SMBUS RECEIVE BYTE PROTOCOL RESPONSE TO ARA

START

Alert Response

Address

ACK

EMC1001

Slave Address

NACK

STOP

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