LM95231

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SNIS139E – FEBRUARY 2005 – REVISED MARCH 2013

2. When SMBDAT is HIGH, have the master initiate an SMBus start. The LM95231 will respond properly to an

SMBus start condition at any point during the communication. After the start the LM95231 will expect an

SMBus Address address byte.

ONE-SHOT CONVERSION

The One-Shot register is used to initiate a single conversion and comparison cycle 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.

LM95231 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

Command

P0-P7: Command

Table 6. Register Summary

Name

Command

Power-On

Read/Write

# of used bits

Comments

(Hex)

Default Value

(Hex)

Status Register

02h

-

RO

5

4 status bits and 1 busy bit

Configuration Register

03h

00h

R/W

5

Includes conversion rate control

Remote Diode Filter Control

06h

05h

R/W

2

Controls thermal diode filter

setting

Remote Diode Model Type

30h

01h

R/W

2

Selects the 2N3904 or Pentium

Select

4 processor on 90nm process

thermal diode model

Remote Diode TruTherm Mode

07h

01h

8

Enables or disables TruTherm

Control

technology for Remote Diode

measurements

1-shot

0Fh

-

WO

-

Activates one conversion for all

3 channels if the chip is in

standby mode (i.e. RUN/STOP

bit = 1). Data transmitted by the

host is ignored by the LM95231.

Local Temperature MSB

10h

-

RO

8

Remote Temperature 1 MSB

11h

-

RO

8

Remote Temperature 2 MSB

12h

-

RO

8

Local Temperature LSB

20h

-

RO

2

All unused bits will report zero

Remote Temperature 1 LSB

21h

-

RO

3/5

All unused bits will report zero

Remote Temperature 2 LSB

22h

-

RO

3/5

All unused bits will report zero

Manufacturer ID

FEh

01h

RO

Revision ID

FFh

A1h

RO

STATUS REGISTER

D7

D6

D5

D4

D3

D2

D1

D0

Busy

Reserved

R2TME

R1TME

RD2M

RD1M

0

0

0

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