Temperature Sensor and
System Monitor in a 10-Pin µMAX
MAX6683
TEMPERATURE
MONITORING CYCLE
INTERRUPT
STATUS READ
T
HOT
T
HYST
ALERT
DEFAULT MODE
ALERT
ALERT
ONE-TIME
INTERRUPT MODE
COMPARATOR MODE
Figure 1. Alert Response to Temperature Interrupts
Write Byte Format
S
ADDRESS
7 bits
W/R
0
ACK
COMMAND
8 bits
Command Byte: selects which
register you are writing to
ACK
DATA
8 bits
Data Byte: data goes into the register
set by the co mma nd byte ( to se t
thresholds, configuration masks, and
sampling rate)
ACK
P
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Read Byte Format
S
ADDRESS
7 bits
W/R
0
ACK
COMMAND
8 bits
ACK
S
ADDRESS
7 bits
W/R
1
ACK
DATA
8 bits
A
P
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Send Byte Format
S
ADDRESS
7 bits
W/R
0
ACK
Command Byte: selects
which register you are
reading from
Slave Address: repeated
due to change in data-
flow direction
Receive Byte Format
Data Byte: reads from
the register set by the
command byte
COMMAND
8 bits
ACK
P
S
ADDRESS
7 bits
W/R
1
ACK
DATA
8 bits
A
P
Data Byte: writes data to the
register commanded by the
last Read Byte or Write Byte
transmission
Read Word Format
S
ADDRESS
7 bits
S = Start condition
P = Stop condition
W/R
0
ACK
COMMAND
8 bits
ACK
S
ADDRESS
7 bits
W/R ACK
1
Data Byte: reads data from
the register commanded
by the last Read Byte or
Write Byte transmission;
also used for SMBus alert
Response return address
DATA_LOW_byte
8 bits
ACK
DATA_HIGH_byte
8 bits
A
P
Shaded = Slave transmission
A = Not acknowledged
Figure 2. SMBus Protocols
10
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
