Rainbow-electronics LM32 Manuel d'utilisateur télécharger pdf (Page 19)

2.0 Register Set (Continued)

2.9.3 Temperature Data Readout (Addr: 001 001; 09h)

Reg

Add

Name

Val

Bit

MSb

Bit

LSb

001 001

Local

Temperature

Data

Readout

MSb

Sign

128

˚C

64˚C 32˚C 16˚C 8˚C 4˚C 2˚C 1˚C

0.5

˚C

Reserved

SNUM

Reserved

00 00

Processor/

Remote

Temperature

Data

Readout

Reserved

Res

00 0

Bit Type Description

0ROReserved. Will always read "0".

1ROReserved for Local Temperature Data Readout. Will always read "0".

EF (Error Flag) for Remote Temperature Data Readout. This bit indicates that an error was detected

during the measurement of the current remote Temperature sensor such as a diode fault condition. When a

diode fault occurs the value of the temperature reading will be 200h or -256˚C.

0: No error detected.

1: Error detected.

3-2 RO SNUM (Sensor Number). This field indicates the number of the current Temperature Sensor, to which the

data in the Temperature Readout field belongs. Temperature Sensor 0 is always assigned to the local

sensor of the LM32.

0: Local temperature sensor (see Table Thermal Diode Input Mapping)

1-2: Remote sensor 1 and 2 (see Table Thermal Diode Input Mapping)

5-4 RO Reserved. Will always read "0".

15-6 RO Temperature Readout. This field holds the result of the temperature measurement. The active size of this

field for the LM32 is 10-bits, left justified. See Table Temperature Data Format for examples.

Thermal Diode Input Mapping

Sensor Number

(SNUM) Sensor Input Board Connection

0 Local none

1 Processor, D1+/D1- CPU Thermal Diode

2 Remote, D2+/D2- MMBT3904 Thermal Diode or GPU

Thermal Diode

All LM32 temperature data has a common format. The LM32’s temperature data format is two’s complement and has 10-bits of

resolution with the LSb having a weight of 0.5 ˚C. The LM32 can resolve temperature between +255.5 ˚C and -256 ˚C, inclusive.

It can measure local temperatures between +85 ˚C and 0 ˚C and remote temperatures between +125 ˚C and 0 ˚C with an

accuracy of

3.0 ˚C.

Temperature Data Format

Temperature Binary Hex

+140 ˚C 01 0001 1000 118h

+100 ˚C 00 1100 1000 0C8h

+1 ˚C 00 0000 0010 002h

0 ˚C 00 0000 0000 000h

- 0.5 ˚C 11 1111 1111 3FFh

-1 ˚C 11 1111 1110 3FEh

LM32

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Rainbow-electronics LM32 Manuel d'utilisateur Page 19

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