EMC1428-1-AP-TR SMSC, EMC1428-1-AP-TR Datasheet - Page 12

• Manufacturer Part Number: EMC1428-1-AP-TR
• Description: Board Mount Temperature Sensors Octal Temp Sensor
• Manufacturer: SMSC

Specifications of EMC1428-1-AP-TR

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

Chapter 3 System Management Bus Interface Protocol
Revision 0.69 (06-29-09)
3.1
3.2
SMDATA
START
1 -> 0
SMCLK
System Management Bus Interface Protocol
Write Byte
The EMC1428 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
The EMC1428 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 EMC1428 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
1001_100
P
SLAVE
T
BUF
S
T
T
S - Start Condition
LOW
HD:STA
WR
0
T
HD:DAT
T
RISE
Figure 3.1 SMBus Timing Diagram
DATA SENT
ACK
TO DEVICE
Table 3.2 Write Byte Protocol
0
Table 3.1 Protocol Format
T
HIGH
1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones
DATASHEET
REGISTER
T
ADDRESS
SU:DAT
T
XXh
FALL
12
DATA SENT TO
THE HOST
Figure
Table
3.1.
3.1.
ACK
0
S
T
T
SU:STA
HD:STA
REGISTER
DATA
XXh
P - Stop Condition
Table
ACK
0
T
SU:STO
SMSC EMC1428
3.2:
Datasheet
0 -> 1
STOP
P