1.5°C SMBus Temperature Sensor in Miniature SOT-23

Datasheet

Revision 1.6 (01-29-07)

8

SMSC EMC1001

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

Output," on page 11.

The Alert Response Address is polled by the Host whenever it detects an

Response Address and respond with its device address as shown below.

3.6

SMBus Addresses

The EMC1001 is available in two versions, each of which has four 7-bit slave addresses that are

determines the slave address per Table 1.2 on page 3. Attempting to communicate with the EMC1001

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 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 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

EMC1001 SLAVE

ADDRESS

NACK

STOP

Bits:

17

1

1

8

1

1