Datasheet
D7 D6 D5 D4 D3 D2 D1 D0
1 9 1 9
Ack
by
LM95241
Start by
Master
R/W
Frame 1
Serial Bus Address Byte
Frame 2
Command Byte
Ack
by
LM95241
D7 D6 D5 D4 D3 D2 D1 D0
1 9
Frame 3
Data Byte
Ack by
LM95241
Stop
by
Master
SMBCLK
SMBDAT
SMBCLK
(Continued)
SMBDAT
(Continued)
A5 A3 A2 A0A6 A4 A1
D7 D6 D5 D4 D3 D2 D1 D0
1 9 1 9
Ack
by
LM95241
Start by
Master
R/W
Frame 1
Serial Bus Address Byte
Frame 2
Command Byte
Ack by
LM95241
SMBCLK
SMBDAT
A5 A3 A2 A0A6 A4 A1
Stop
by
Master
LM95241
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SNIS143E –AUGUST 2006–REVISED MARCH 2013
A Write to the LM95241 will always include the address byte and the command byte. A write to any register
requires one data byte.
Reading the LM95241 can take place either of two ways:
1. If the location latched in the Command Register is correct (most of the time it is expected that the Command
Register will point to one of the Read Temperature Registers because that will be the data most frequently
read from the LM95241), then the read can simply consist of an address byte, followed by retrieving the data
byte.
2. If the Command Register needs to be set, then an address byte, command byte, repeat start, and another
address byte will accomplish a read.
The data byte has the most significant bit first. At the end of a read, the LM95241 can accept either acknowledge
or No Acknowledge from the Master (No Acknowledge is typically used as a signal for the slave that the Master
has read its last byte). When retrieving all 11 bits from a previous remote diode temperature measurement, the
master must insure that all 11 bits are from the same temperature conversion. This may be achieved by reading
the MSB register first. The LSB will be locked after the MSB is read. The LSB will be unlocked after being read. If
the user reads MSBs consecutively, each time the MSB is read, the LSB associated with that temperature will be
locked in and override the previous LSB value locked-in.
SMBus Timing Diagrams for Access of Data
Figure 8. Serial Bus Write to the Internal Command Register
Figure 9. Serial Bus Write to the internal Command Register followed by a Data Byte
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