Datasheet
LM82
SNIS113D –JANUARY 2000–REVISED MARCH 2013
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The data byte has the most significant bit first. At the end of a read, the LM82 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).
SERIAL INTERFACE ERROR RECOVERY
The LM82 SMBus lines will be reset to the SMBus idle state if the SMBData or SMBCLK lines are held low for 40
ms or more (t
TIMEOUT
). The LM82 may or may not reset the state of the serial interface logic if either of the
SMBData or SMBCLK lines are held low between 25 ms and 40 ms. TIMEOUT allows a clean recovery in cases
where the master may be reset while the LM82 is transmitting a low bit thus preventing possible bus lock up.
Whenever the LM82 sees the start condition its serial interface will reset to the beginning of the communication,
thus the LM82 will expect to see an address byte next. This simplifies recovery when the master is reset while
the LM82 is transmitting a high.
LM82 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.
P7 P6 P5 P4 P3 P2 P1 P0
0 Command Select
P0-P7: Command Select
Command Select Power On Default State Register Name Register Function
Address
<P7:P0> hex <D7:D0> binary <D7:D0> decimal
00h 0000 0000 0 RLT Read Local Temperature
01h 0000 0000 0 RRT Read Remote Temperature
02h 0000 0000 0 RSR Read Status Register
03h 0000 0000 0 RC Read Configuration
04h 0000 0000 0 Reserved
05h 0111 1111 127 RLHS Read Local HIGH Setpoint
06h Reserved
07h 0111 1111 127 RRHS Read Remote HIGH Setpoint
08h Reserved
09h 0000 0000 WC Write Configuration
0Ah Reserved
0Bh 0111 1111 127 WLHS Write Local HIGH Setpoint
0Ch Reserved
0Dh 0111 1111 127 WRHS Write Remote HIGH Setpoint
0Eh-2Fh Reserved for Future Use
30h-31h 0000 0000 0 Reserved
32h-34h Reserved for Future Use
35h 0000 0000 0 Reserved
36h-37h Reserved for Future Use
38h 0111 1111 127 Reserved
39h Reserved for Future Use
3Ah 0111 1111 127 Reserved
3Bh-41h Reserved for Future Use
42h 0111 1111 127 RTCS Read T_CRIT Setpoint
43h-4Fh Reserved for Future Use
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