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12-Bit Plus Sign Temperature Sensors with
SMBus/I 2 C-Compatible Serial Interface
Write Byte Format
S ADDRESS WR
ACK
COMMAND
ACK
DATA
ACK
P
7 bits
Slave Address:
equivalent
to chip-select line of a 3-
wire interface
Write Word Format
8 bits
Command Byte: selects
register you are writing to
8 bits
Data Byte: data goes into the register set by the
command byte
S ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
DATA
ACK
P
7 bits
8 bits
8 bits
(MSB)
8 bits
(LSB)
Slave Address:
equivalent to chip-select
line of a
3-wire interface
Read Byte Format
Command Byte:
selects register you
are writing to
Data Bytes: data goes into the
register set by the command
byte
S
ADDRESS WR
ACK
COMMAND
ACK
S
ADDRESS RD
ACK
DATA /// P
7 bits
Slave Address: equivalent
to chip-select line
8 bits
Command Byte:
selects register you
are reading from
7 bits
Slave Address: repeated due to
change in data-flow direction
8 bits
Data Byte: reads from the
register set by the command
byte
Read Word Format
S ADDRESS WR
ACK
COMMAND
ACK
S
ADDRESS
RD
ACK
DATA
ACK
DATA
///
P
7 bits
8 bits
7 bits
8 bits
8 bits
(MSB)
(LSB)
Slave Address:
equivalent to chip-
select line
S = Start condition
P = Stop condition
Command Byte:
selects register you
are reading from
Shaded = Slave transmission
/// = Not acknowledged
Slave Address: repeated
due to change in data-flow
direction
Data Bytes: reads from the
register set by the command
byte
Figure 1. 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 2. 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
6
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