PCT2075DP datasheet(11/37 Pages) NXP

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PCT2075

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Product data sheet

Rev. 9.1 — 21 April 2017

11 of 37

NXP Semiconductors

PCT2075

I2C-bus Fm+ digital temperature sensor and thermal watchdog

7.4.2 Configuration register

The Configuration register (Conf) is a write/read register and contains an 8-bit

non-complement data byte that is used to configure the device for different operation

conditions. Table 10 shows the bit assignments of this register.

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 11 shows

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

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

provided to the bus and should be all collected by the controller for a valid temperature

reading. However, only the 11 most significant bits should be used, and the five 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.

Table 10.

Conf register

Legend: * = default value.

Bit

Symbol

Access

Value

Description

B[7:5]

reserved

R/W

000*

unused; any value written to these bits does not

affect operation

B[4:3]

OS_F_QUE[1:0] R/W

OS fault queue programming

00*

queue value = 1

queue value = 2

queue value = 4

queue value = 6

OS_POL

R/W

OS polarity selection

OS active LOW

OS active HIGH

OS_COMP_INT R/W

OS operation mode selection

OS comparator

OS interrupt

SHUTDOWN

R/W

device operation mode selection

normal

shutdown

Table 11.

Temp register

MSByte

LSByte

D10

D8D7

D6D5

D4D3

D2D1D0

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