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

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

14

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