MAX6633 MAXIM [Maxim Integrated Products], MAX6633 Datasheet - Page 6

• Manufacturer Part Number: MAX6633
• Description: 12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
• Manufacturer: MAXIM [Maxim Integrated Products]

12-Bit Plus Sign Temperature Sensors with
SMBus/I
Figure 1. SMBus Protocols
Figure 2. SMBus Write Timing Diagram
6
S
S
S = Start condition
P = Stop condition
Write Word Format
Read Word Format
Write Byte Format
Read Byte Format
_______________________________________________________________________________________
S
S
SMBCLK
SMBDATA
Slave Address: equivalent
to chip-select line
Slave Address:
equivalent to chip-
select line
ADDRESS
ADDRESS
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
7 bits
7 bits
Slave Address:
equivalent
to chip-select line of a 3-
wire interface
Slave Address:
equivalent to chip-select
line of a
3-wire interface
ADDRESS
ADDRESS
t
SU:STA
7 bits
7 bits
A
WR
WR
t
HD:STA
2
C-Compatible Serial Interface
t
LOW
Shaded = Slave transmission
/// = Not acknowledged
ACK
ACK
WR
WR
B
t
HIGH
Command Byte:
selects register you
are reading from
Command Byte:
selects register you
are reading from
COMMAND
COMMAND
8 bits
8 bits
ACK
ACK
t
SU:DAT
C
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
Command Byte:
selects register you
are writing to
COMMAND
ACK
ACK
Command Byte: selects
register you are writing to
8 bits
COMMAND
D
8 bits
S
S
ACK
E
Slave Address: repeated due to
change in data-flow direction
Slave Address: repeated
due to change in data-flow
direction
ADDRESS
ADDRESS
F
7 bits
7 bits
Data Bytes: data goes into the
register set by the command
byte
ACK
t
DATA
(MSB)
HD:DAT
8 bits
G
RD
RD
Data Byte: data goes into the register set by the
command byte
ACK
ACK
DATA
8 bits
H
ACK
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
DATA
Data Bytes: reads from the
register set by the command
byte
8 bits
(LSB)
DATA
(MSB)
8 bits
I
Data Byte: reads from the
register set by the command
byte
ACK
J K
DATA
8 bits
ACK
ACK
DATA
(LSB)
8 bits
///
t
SU:STO
P
L
///
t
BUF
P
M
P
P