EMC2101-R-ACZL-TR datasheet(15/57 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

SMSC EMC2101

Revision 2.54 (06-16-09)

DATASHEET

Chapter 4 System Management Bus Interface Protocol

4.1

System Management Bus Interface Protocol

The EMC2101 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 EMC2101 will not stretch the clock signal.

The EMC2101 powers up as an SMBus client (after loading from EEPROM as applicable).

The EMC2101 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Receive Byte and the

Alert Response Address as valid protocols 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

Table 4.2 Write Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

STOP

181

SMDTA

SMCLK

TLOW

TRISE

THIGH

TFALL

TBUF

THD:STA

S - Start Condition

P - Stop Condition

THD:DAT

TSU:DAT

TSU:STA

THD:STA

TSU:STO

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