LM95233_15 datasheet(19/44 Pages) TI

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Ack

LM95233

Start by

Master

R/W

Frame 1

Serial Bus Address Byte

Frame 2

Command Byte

Ack by

LM95233

SMBCLK

SMBDAT

Stop

Master

Ack

LM95233

Start by

Master

R/W

Frame 1

Serial Bus Address Byte

Frame 2

Command Byte

Ack

LM95233

Frame 3

Data Byte

Ack by

LM95233

Stop

Master

SMBCLK

SMBDAT

SMBCLK

(Continued)

SMBDAT

(Continued)

LM95233

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SNIS145E – AUGUST 2006 – REVISED MARCH 2013

A Write to the LM95233 will always include the address byte and the command byte. A write to any register

requires one data byte.

Reading the LM95233 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

read from the LM95233), 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 LM95233 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). It takes the LM95233 95 ms (typical, all channels enabled) to measure the temperature of

the remote diodes and internal diode. 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

Figure 16. (a) Serial Bus Write to the internal Command Register followed by a the Data Byte

Figure 17. (b) Serial Bus Write to the Internal Command Register

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