PCT2202 datasheet(7/30 Pages) NXP

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PCT2202

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Product data sheet

Rev. 1.1 — 14 August 2015

7 of 30

NXP Semiconductors

PCT2202

Ultra low power, 1.8 V, 1 deg. C accuracy, I2C-bus digital temp sensor

For positive temperatures (for example, +50

C): Two’s complement is not performed on

positive numbers, therefore, simply convert the number to binary code with the 12-bit,

left-justified format, and MSB = 0 to denote a positive sign.

Example: (+50

C) / (0.0625 C/count) = 800 (decimal) = 320h = 0011 0010 0000.

For negative temperatures (for example,

25 C): Generate the two’s complement of a

negative number by complementing the absolute value binary number and adding 1.

Denote a negative number with MSB = 1.

Example: (

25 C) / (0.0625 C/count) = 400 (decimal) = 190h = 001 1001 0000.

Two’s complement format: 1110 0110 1111 + 1 = 1110 0111 0000.

Table 6.

Byte 1 of Temperature register

Extended mode 13-bit configuration shown in parentheses.

T11

(T12)

T10

(T11)

(T10)

(T9)

(T8)

(T7)

(T6)

(T5)

Table 7.

Byte 2 of Temperature register

Extended mode 13-bit configuration shown in parentheses.

(T4)

(T3)

(T2)

(T1)

(T0)

(0)

(1)

Table 8.

12-bit temperature data format

The resolution for the Temp ADC in Internal temperature mode is 0.0625

C/count.

Temperature (

C)

Digital output (binary)

Hex

128

0111 1111 1111

7FFh

127.9375

0111 1111 1111

7FFh

100

0110 0100 0000

640h

0101 0000 0000

500h

0100 1011 0000

4B0h

0011 0010 0000

320h

0001 1001 0000

190h

0.25

0000 0000 0100

004h

0000 0000 0000

000h

0.25

1111 1111 1100

FFCh

25

1110 0111 0000

E70h

55

1100 1001 0000

C90h

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