RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
Table 5.2 Protocol Format
DATA SENT
TO DEVICE
DATA SENT TO
THE HOST
# of bits sent
# of bits sent
5.2.1
Write Byte
The Write Byte is used to write one byte of data to the registers as shown below Table 5.3.
Table 5.3 Write Byte Protocol
SLAVE
ADDRESS
REGISTER
ADDRESS
REGISTER
DATA
START
1 -> 0
WR
ACK
ACK
ACK
STOP
YYYY_YYY
0
0
0 -> 1
0
XXh
0
0 -> 1
5.2.2
Read Byte
The Read Byte protocol is used to read one byte of data from the registers as shown in Table 5.4.
Table 5.4 Read Byte Protocol
SLAVE
ADDRESS
REGISTER
ADDRESS
SLAVE
ADDRESS
REGISTER
DATA
START
WR
ACK
ACK
START
RD
ACK
NACK STOP
0 -> 1
1 -> 0
YYYY_YYY
0
0
XXh
0
1 -> 0
YYYY_YYY
1
0
XXh
1
5.2.3
Send Byte
The Send Byte protocol is used to set the internal address register pointer to the correct address
location. No data is transferred during the Send Byte protocol as shown in Table 5.5.
Table 5.5 Send Byte Protocol
SLAVE
ADDRESS
REGISTER
ADDRESS
START
WR
ACK
ACK
STOP
1 -> 0
YYYY_YYY
0
0
XXh
1
0 -> 1
SMSC EMC2113
Revision 1.2 (10-08-09)
DATA1S9HEET
SMSC [ SMSC CORPORATION ]
