LM75BTP,147 データシートの表示（PDF） - NXP Semiconductors.

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LM75BTP,147

Digital temperature sensor and thermal watchdog

NXP Semiconductors. 

NXP Semiconductors

LM75B

Digital temperature sensor and thermal watchdog

Table 8. Conf register …continued

Legend: * = default value.

Bit

Symbol

Access Value Description

B2

OS_POL

R/W

OS polarity selection

0*

OS active LOW

1

OS active HIGH

B1

OS_COMP_INT R/W

OS operation mode selection

0*

OS comparator

1

OS interrupt

B0

SHUTDOWN R/W

device operation mode selection

0*

normal

1

shutdown

7.4.3 Temperature register

The Temperature register (Temp) holds the digital result of temperature measurement or

monitor at the end of each analog-to-digital conversion. This register is read-only and

contains two 8-bit data bytes consisting of one Most Significant Byte (MSByte) and one

Least Significant Byte (LSByte). However, only 11 bits of those two bytes are used to store

the Temp data in two’s complement format with the resolution of 0.125 C. Table 9 shows

the bit arrangement of the Temp data in the data bytes.

Table 9. Temp register

MSByte

LSByte

7654321076543210

D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X X

When reading register Temp, all 16 bits of the two data bytes (MSByte and LSByte) are

provided to the bus and must be all collected by the controller to complete the bus

operation. However, only the 11 most significant bits should be used, and the 5 least

significant bits of the LSByte are zero and should be ignored. One of the ways to calculate

the Temp value in C from the 11-bit Temp data is:

1. If the Temp data MSByte bit D10 = 0, then the temperature is positive and Temp value

(C) = +(Temp data)  0.125 C.

2. If the Temp data MSByte bit D10 = 1, then the temperature is negative and

Temp value (C) = (two’s complement of Temp data)  0.125 C.

Examples of the Temp data and value are shown in Table 10.

Table 10. Temp register value

11-bit binary

Hexadecimal value

(two’s complement)

011 1111 1000

3F8

011 1111 0111

3F7

011 1111 0001

3F1

011 1110 1000

3E8

000 1100 1000

0C8

000 0000 0001

001

Decimal value

1 016

1 015

1 009

1 000

200

1

Value

+127.000 C

+126.875 C

+126.125 C

+125.000 C

+25.000 C

+0.125 C

LM75B

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 6.1 — 6 February 2015

© NXP B.V. 2015. All rights reserved.

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