EMC1073-1-AIZL-TR SMSC, EMC1073-1-AIZL-TR Datasheet - Page 13

• Manufacturer Part Number: EMC1073-1-AIZL-TR
• Description: Board Mount Temperature Sensors SMBus Temp Sensor Selectable Address
• Manufacturer: SMSC

Specifications of EMC1073-1-AIZL-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Multiple Channel 1°C Temperature Sensors with Selectable Address
Datasheet
Chapter 4 System Management Bus Interface Protocol
.
SMSC EMC1073 / EMC1074
4.1
4.2
SMCLK
SMDTA
START
1 -> 0
P
The EMC1073 and EMC1074 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 EMC1073 and EMC1074 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 EMC1073 and EMC1074 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.
The Write Byte is used to write one byte of data to the registers as shown below
ADDRESS
System Management Bus Interface Protocol
Write Byte
1001_100
SLAVE
T
BUF
S
T
T
S - Start Condition
HD:STA
LOW
WR
0
T
HD:DAT
T
RISE
Figure 4.1 SMBus Timing Diagram
# of bits sent
DATA SENT
ACK
TO DEVICE
Table 4.2 Write Byte Protocol
0
Table 4.1 Protocol Format
T
HIGH
DATASHEET
REGISTER
T
ADDRESS
SU:DAT
T
XXh
FALL
13
DATA SENT TO
# of bits sent
THE HOST
Table
4.1.
ACK
0
Figure
S
T
T
SU:STA
HD:STA
4.1.
REGISTER
DATA
XXh
P - Stop Condition
Revision 1.39 (10-11-10)
Table
ACK
0
T
SU:STO
4.2:
0 -> 1
STOP
P