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Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
Write Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
P
7 bits
8 bits
8 bits
1
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Command Byte: selects which
register you are writing to
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
Read Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
S
ADDRESS
RD
ACK
DATA
///
P
7 bits
Slave Address: equiva-
lent to chip-select line
Send Byte Format
8 bits
Command Byte: selects
which register you are
reading from
7 bits
Slave Address: repeated
due to change in data-
flow direction
Receive Byte Format
8 bits
Data Byte: reads from
the register set by the
command byte
S
ADDRESS
WR
ACK
COMMAND
ACK
P
S
ADDRESS
RD
ACK
DATA
///
P
7 bits
8 bits
Command Byte: sends com-
mand with no data, usually
used for one-shot command
7 bits
8 bits
Data Byte: reads data from
the register commanded
by the last Read Byte or
Write Byte transmission;
S = Start condition
P = Stop condition
Shaded = Slave transmission
/// = Not acknowledged
also used for SMBus Alert
Response return address
Figure 3. SMBus Protocols
A
t LOW
B
t HIGH
C
D
E
F
G
H
I
J
K
L
M
SMBCLK
SMBDATA
t SU:STA
t HD:STA
t SU:DAT
t HD:DAT
t SU:STO t BUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
Figure 4. SMBus Write Timing Diagram
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = SLAVE PULLS SMBDATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
A
t LOW
B
t HIGH
C
D
E
F
G
H
I
J
K
L
M
SMBCLK
SMBDATA
t SU:STA t HD:STA
t SU:DAT
t SU:STO
t BUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLEAR PULSE
J = STOP CONDITION, DATA
EXECUTED BY SLAVE
K = NEW START CONDITION
Figure 5. SMBus Read Timing Diagram
_______________________________________________________________________________________
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