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AN3209 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện AN3209
Giải thích chi tiết về linh kiện  Developing your M24LR64-R datalogger application for temperature acquisition
PDF  42 Pages
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AN3209 bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Component overview
AN3209
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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
11
12
Always
zero
Digital
output
(Hex)
12-bit resolution
0000
11-bit resolution
0
0000
10-bit resolution
0
0
0000
9-bit resolution
0
0
0
0000
+125
0
111
1101
0
0
0
0
0000
7D00
+25.0625
0
001
1001
0
0
0
1
0000
1910
+10.125
0
000
1010
0
0
1
0
0000
0A20
+0.5
0
000
0000
1
0
0
0
0000
0080



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