AN3209 datasheet(20/42 Pages) STMICROELECTRONICS

20 / 42 page

Component overview

AN3209

20/42

Doc ID 17419 Rev 2

Read acquired temperature

To read the 2 bytes temperature register, the I2C master must send a Pointer Set

Configuration Register Write frame followed by a 2-byte read frame (see Figure 15).

This operation is managed by calling the I2C_SS_BufferRead(unit8_t* pBuffer,

unit16_t ReadAddr, unit8_t NumberByteToRead)

function.

Figure 15.

Typical pointer set followed by a READ for 2-byte register

2.3.4

Temperature format

Table 8 shows the relationship between the output digital data and the external temperature

for 9 to 12-bit resolution. The left-most bit in the output data stream controls temperature

polarity information for each conversion. If the sign bit is '0', the temperature is positive and

of the sign bit is '1', the temperature is negative.

Table 8.

Relationship between temperature and digital output

Temperature

(°C)

Sign

Number of bits used by

conversion resolution

910

Always

zero

Digital

output

(Hex)

12-bit resolution

0000

11-bit resolution

0000

10-bit resolution

0000

9-bit resolution

0000

+125

111

1101

0000

7D00

+25.0625

001

1001

0000

1910

+10.125

000

1010

0000

0A20

+0.5

000

0000

0080

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