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EMC2103 Fiches technique(PDF) 18 Page - Microchip Technology

No de pièce EMC2103
Description  RPM-Based Fan Controller with Hardware Thermal Shutdown
PDF  85 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

EMC2103 Fiches technique(HTML) 18 Page - Microchip Technology

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RPM-Based Fan Controller with Hardware Thermal Shutdown
Datasheet
 2013 Microchip Technology Inc.
DS0005250A-page 18
Chapter 4 Communications
4.1
System Management Bus Interface Protocol
The EMC2103 communicates with a host controller, such as an 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 Figure 4.1. Stretching of the SMCLK signal is supported, however
the EMC2103 will not stretch the clock signal.
The EMC2103 contains a single SMBus interface. The EMC2103 client interfaces are SMBus 2.0
compatible and support Send Byte, Read Byte, Receive Byte and the Alert Response Address as valid
protocols. These protocols are used as shown below.
All of the below protocols use the convention in Table 4.1.
4.2
Write Byte
The Write Byte is used to write one byte of data to the registers as shown below Table 4.2:
Figure 4.1 SMBus Timing Diagram
Table 4.1 Protocol Format
DATA SENT
TO DEVICE
DATA SENT TO
THE HOST
# of bits sent
# of bits sent
Table 4.2 Write Byte Protocol
START
SLAVE
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
REGISTER
DATA
ACK
STOP
0 -> 1
0101_110
0
0
0 -> 1
0
XXh
0
1 -> 0



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