1°C Dual SMBus Sensor with Resistance Error Correction

Datasheet

Revision 1.3 (03-24-06)

8

SMSC EMC1002

DATASHEET

3.4

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 can be used for consecutive

reads of the same register as shown below:

3.5

Alert Response Address

The Alert Response Address is polled by the Host whenever it detects an SMBALERT#, i.e. when the

ALERT

respond with its device address as shown below:

3.6

SMBus Addresses

The EMC1002-2 may be configured to one of four 7-bit slave addresses that are enabled based on

address per Table 1.2, “Ordering Information,” on page 3. Attempting to communicate with the

EMC1002 SMBus interface with an invalid slave address or invalid protocol results in no response from

the device and does not affect its register contents. The EMC1002 supports stretching of the SMCLK

signal by other devices on the SMBus but will not perform this operation itself. The EMC1002 has an

SMBus timeout feature. Bit 7 of the Consecutive Alert register enables this function when set to 1 (the

default setting is 0). When this feature is enabled, the SMBus will timeout after approximately 25ms

of inactivity.

Table 3.4 SMBus Receive Byte Protocol

FIELD:

START

SLAVE ADDR

RD

ACK

REG. DATA

NACK

STOP

Bits:

17

1

1

8

1

1

Table 3.5 Modified SMBus Receive Byte Protocol Response to ARA

FIELD:

START

ALERT

RESPONSE

ADDRESS

RD

ACK

EMC1002 SLAVE

ADDRESS

NACK

STOP

Bits:

17

1

1

8

1

1