RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Chapter 4 System Management Bus Interface Protocol
The EMC2102 communicates 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 Figure 4.1. Stretching of the SMCLK signal is supported,
however the EMC2102 will not stretch the clock signal.
.
TLOW
THIGH
THD:STA
TSU:STO
TRISE
TFALL
SMCLK
SMDTA
TSU:STA
THD:STA
THD:DAT
TSU:DAT
TBUF
S
S
P
P - Stop Condition
P
S - Start Condition
Figure 4.1 SMBus Timing Diagram
The EMC2102 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Receive Byte and Write
Byte as valid protocols as shown below. It will respond to the Alert Response Address protocol but is
not in full compliance.
All of the below protocols use the convention in Table 4.1.
Table 4.1 Protocol Format
DATA SENT
TO DEVICE
DATA SENT TO
THE HOST
# of bits sent
# of bits sent
4.1
Write Byte
The Write Byte is used to write one byte of data to the registers as shown below Table 4.2:
Table 4.2 Write Byte Protocol
SLAVE
ADDRESS
REGISTER
ADDRESS
REGISTER
DATA
START
WR
ACK
ACK
ACK
STOP
1
7
1
1
8
1
8
1
1
SMSC EMC2102
Revision 1.95 (10-19-06)
DATA1S5HEET
SMSC [ SMSC CORPORATION ]
