PCT2075DP datasheet(12/37 Pages) NXP

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PCT2075

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Product data sheet

Rev. 9.1 — 21 April 2017

12 of 37

NXP Semiconductors

PCT2075

I2C-bus Fm+ digital temperature sensor and thermal watchdog

Examples of the Temp data and value are shown in Table 12.

For 9-bit Temp data application in replacing the industry standard LM75, just use only

9 MSB bits of the two bytes and disregard 7 LSB of the LSByte. The 9-bit Temp data with

0.5

C resolution of the device is defined exactly in the same way as for the standard

LM75 and it is here similar to the Tos and Thyst registers.

A single byte read (MSByte) of the Temp register is allowed. Then the temperature

resolution will be 1.00

C instead.

7.4.4 Overtemperature shutdown threshold (Tos) and hysteresis (Thyst) registers

These two registers, are write/read registers, and also called set-point registers. They are

used to store the user-defined temperature limits, called overtemperature shutdown

threshold (Tots) and hysteresis temperature (Thys), for the device watchdog operation. At

the end of each conversion the Temp data will be compared with the data stored in these

two registers in order to set the state of the device OS output; see Section 7.1.

Each of the set-point registers contains two 8-bit data bytes consisting of one MSByte and

one LSByte in the same format as the Temperature register. However, only 9 bits of the

two bytes are used to store the set-point data in two’s complement format with the

resolution of 0.5

C. Table 13 and Table 14 show the bit arrangement of the Tos data and

Thyst data in the data bytes.

Notice that because only 9-bit data are used in the set-point registers, the device uses

only the 9 MSB of the Temp data for data comparison.

Table 12.

Temp register value

11-bit binary

(two’s complement)

Hexadecimal value

Decimal value

Value

011 1111 1000

3F8

1016

+127.000

C

011 1111 0111

3F7

1015

+126.875

C

011 1111 0001

3F1

1009

+126.125

C

011 1110 1000

3E8

1000

+125.000

C

000 1100 1000

0C8

200

+25.000

C

000 0000 0001

001

+0.125

C

000 0000 0000

000

0.000

C

111 1111 1111

7FF

1

0.125 C

111 0011 1000

738

200

25.000 C

110 0100 1001

649

439

54.875 C

110 0100 1000

648

440

55.000 C

Table 13.

Tos register

MSByte

LSByte

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