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Temperature Sensor and
System Monitor in a 10-Pin μMAX
TEMPERATURE
MONITORING CYCLE
INTERRUPT
STATUS READ
T HOT
T HYST
ALERT
DEFAULT MODE
ALERT
ONE-TIME
ALERT
INTERRUPT MODE
COMPARATOR MODE
Figure 1. Alert Response to Temperature Interrupts
Write Byte Format
S
ADDRESS
W/R
ACK
COMMAND
ACK
DATA
ACK
P
7 bits
0
8 bits
8 bits
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 co mma nd byte ( to se t
thresholds, configuration masks, and
sampling rate)
Read Byte Format
S
ADDRESS
W/R
ACK
COMMAND
ACK
S
ADDRESS
W/R
ACK
DATA
A
P
7 bits
0
8 bits
7 bits
1
8 bits
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Send Byte Format
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
S
ADDRESS
W/R
ACK
COMMAND
ACK
P
S
ADDRESS
W/R
ACK
DATA
A
P
7 bits
0
8 bits
7 bits
1
8 bits
Read Word Format
Data Byte: writes data to the
register commanded by the
last Read Byte or Write Byte
transmission
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
S
ADDRESS
W/R
ACK
COMMAND
ACK
S
ADDRESS
W/R ACK
DATA_LOW_byte
ACK
DATA_HIGH_byte
A
P
7 bits
0
8 bits
7 bits
1
8 bits
8 bits
S = Start condition
P = Stop condition
Shaded = Slave transmission
A = Not acknowledged
Figure 2. SMBus Protocols
10
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