Datasheet

LM82
www.ti.com 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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