1°C Triple SMBus Temperature Sensor

Datasheet

Revision 2.3 (04-19-05)

8

SMSC EMCT03

DATASHEET

3.2.1

Write Byte

The write Byte is used to write one byte of data to the registers as shown in Table 3.1 below:

3.2.2

Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3.2

below:

3.2.3

SMBus Address

Attempting to communicate with the EMCT03 SMBus interface with an invalid slave address or invalid

protocol, results in no response from the part and will not affect its register content. The EMCT03

supports stretching of the SMCLK signal by other devices on the SMBus but will not perform this

operation itself.

3.3

Register Allocation

The following registers are accessible through the SMBus:

Table 3.1 SMBus Write Byte Protocol

Start

Slave Address

WR

ACK

Register Address

ACK

Register Data

ACK

STOP

17

1

1

8

1

8

1

1

Table 3.2 SMBus Read Byte Protocol

Start

Slave Address

WR

ACK

Register Address

ACK

START

Slave Address

RD

ACK

Register Data

NACK

STOP

17

1

1

8

1

1

7

1

1

8

1

1

Table 3.3 SMBus Address

CONDITION

EMCT03 ADDRESS

EMCT03 Default Address

1001100xb

Table 3.4 Register Table

REGISTER

READ

ADDRESS

REGISTER

WRITE

ADDRESS

REGISTER NAME

DEFAULT

VALUE

00h

N/A

Legacy Format Internal Temperature High Byte

00h

23h

N/A

Legacy Format Internal Temperature Low Byte

00h

01h

N/A

Legacy Format Remote Temperature 1 High Byte

00h

10h

N/A

Legacy Format Remote Temperature 1 Low Byte

00h

F8h

N/A

Legacy Format Remote Temperature 2 High Byte

00h

F9h

N/A

Legacy Format Remote Temperature 2 Low Byte

00h