emc1403 Standard Microsystems Corp., emc1403 Datasheet - Page 14

• Manufacturer Part Number: emc1403
• Description: 1 Degree C Temperature Sensor With Beta Compensation
• Manufacturer: Standard Microsystems Corp.

Chapter 4 System Management Bus Interface Protocol
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Revision 1.30 (05-06-08)
4.1
SMCLK
SMDTA
The EMC1403 and EMC1404 communicate with a host controller, such as an SMSC SIO, through the
SMBus. The SMBus is a two-wire serial communication protocol between a computer host and its
peripheral devices. A detailed timing diagram is shown in
For the first 15ms after power-up the device may not respond to SMBus communications.
The EMC1403 and EMC1404 are SMBus 2.0 compatible and support Send Byte, Read Byte, Write
Byte, Receive Byte, and the Alert Response Address as valid protocols as shown below.
All of the below protocols use the convention in
Attempting to communicate with the EMC1403 and EMC1404 SMBus interface with an invalid slave
address or invalid protocol will result in no response from the device and will not affect its register
contents. Stretching of the SMCLK signal is supported, provided other devices on the SMBus control
the timing.
System Management Bus Interface Protocol
P
T
BUF
S
T
T
S - Start Condition
HD:STA
LOW
T
HD:DAT
T
RISE
Figure 4.1 SMBus Timing Diagram
# of bits sent
DATA SENT
TO DEVICE
Table 4.1 Protocol Format
T
HIGH
DATASHEET
T
SU:DAT
T
14
FALL
DATA SENT TO
# of bits sent
THE HOST
Table
4.1.
1°C Temperature Sensor with Beta Compensation
Figure 4.1
S
T
T
SU:STA
HD:STA
P - Stop Condition
SMSC EMC1403/EMC1404
T
SU:STO
Datasheet
P