LM95213CISDXSLASHNOPB datasheet(21/43 Pages) TI

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Ack

LM95213

Start by

Master

Repeat

Start by

Master

R/W

Frame 1

Serial Bus Address Byte

Frame 2

Command Byte

Ack

LM95213

Ack

LM95213

R/W

Frame 3

Serial Bus Address Byte

Frame 4

Data Byte from the LM95213

No Ack

Master

Stop

Master

SMBCLK

SMBDAT

SMBCLK

(Continued)

SMBDAT

(Continued)

LM95213

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SNIS147A – MARCH 2007 – REVISED MARCH 2013

Figure 15. Serial Bus Write followed by a Repeat Start and Immediate Read

SERIAL INTERFACE RESET

In the event that the SMBus Master is RESET while the LM95213 is transmitting on the SMBDAT line, the

LM95213 must be returned to a known state in the communication protocol. This may be done in one of two

ways:

1. When SMBDAT is LOW, the LM95213 SMBus state machine resets to the SMBus idle state if either

SMBDAT or SMBCLK are held low for more than 35ms (tTIMEOUT). Note that according to SMBus

specification 2.0 all devices are to timeout when either the SMBCLK or SMBDAT lines are held low for 25-

35ms. Therefore, to insure a timeout of all devices on the bus the SMBCLK or SMBDAT lines must be held

low for at least 35ms.

2. When SMBDAT is HIGH, have the master initiate an SMBus start. The LM95213 will respond properly to an

SMBus start condition at any point during the communication. After the start the LM95213 will expect an

SMBus Address address byte.

ONE-SHOT CONVERSION

The One-Shot register is used to initiate a round of conversions and comparisons when the device is in standby

mode, after which the device returns to standby. This is not a data register and it is the write operation that

causes the one-shot conversion. The data written to this address is irrelevant and is not stored. A zero will

always be read from this register. All the channels that are enabled in the Channel Enable Register will be

converted once and the TCRIT1, TCRIT2 and TCRIT3 pins will reflect the comparison results based on this

round of conversion results of the channels that are not masked.

LM95213 Registers

Command register selects which registers will be read from or written to. Data for this register should be

transmitted during the Command Byte of the SMBus write communication.

Command Byte

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LM95213CISDX/NOPB Datasheet(PDF) 21 Page - Texas Instruments

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