LM82

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SNIS113D – JANUARY 2000 – REVISED MARCH 2013

COMMUNICATING with the LM82

There are 13 data registers in the LM82, selected by the Command Register. At power-up the Command

Register is set to “00”, the location for the Read Local Temperature Register. The Command Register latches the

last location it was set to. Reading the Status Register resets T_CRIT_A and INT, so long as a temperature

comparison does not signal a fault (see INT OUTPUT and T_HIGH LIMITS and T_CRIT_A OUTPUT and

T_CRIT LIMIT). All other registers are predefined as read only or write only. Read and write registers with the

same function contain mirrored data.

A Write to the LM82 will always include the address byte and the command byte. A write to any register requires

one data byte.

Reading the LM82 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 LM82), 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.

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