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| 型号： | MCP9808T-E/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 25/52页 |
| 文件大小： | 1085K |
| 描述： | IC TEMP SENSOR DGTL I2C 8MSOP |
| 标准包装： | 2,500 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±1°C |
| 拓扑： | ADC（三角积分型），寄存器库 |
| 输出类型： | 2 线串行，I²C?/SMBUS? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
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?2011 Microchip Technology Inc.
DS25095A-page 25
MCP9808
5.1.3.1
T
A
Bits to Temperature Conversion
To convert the T
A
bits to decimal temperature, the
upper three boundary bits (T
A
<15:13>) must be
masked out. Then, determine the SIGN bit (bit 12) to
check positive or negative temperature, shift the bits
accordingly, and combine the upper and lower bytes of
the 16-bit register. The upper byte contains data for
temperatures greater than +32癈 while the lower byte
contains data for temperature less than +32癈, includ-
ing fractional data. When combining the upper and
lower bytes, the upper byte must be right-shifted by
4 bits (or multiply by 2
4
) and the lower byte must be left-
shifted by 4 bits (or multiply by 2
-4
). Adding the results
of the shifted values provides the temperature data in
decimal format (see Equation 5-1).
The temperature bits are in twos compliment format,
therefore, positive temperature data and negative tem-
perature data are computed differently. Equation 5-1
shows the temperature computation. The example
instruction code, outlined in Example 5-1, shows the
communication flow; also see Figure 5-5 for the timing
diagram.
EQUATION 5-1: BYTES TO
TEMPERATURE
CONVERSION
EXAMPLE 5-1:
SAMPLE INSTRUCTION CODE
Where:
T
A
= Ambient Temperature (癈)
UpperByte = T
A
bit 15 to bit 8
LowerByte = T
A
bit 7 to bit 0
Temperature T
A
e 0癈
Temperature < 0癈
T
A
UpperByte 2
4
LowerByte 2
4
?/DIV>
+
?/DIV>
(
)
=
T
A
256 UpperByte 2
4
LowerByte 2
4
?/DIV>
+
?/DIV>
(
)
=
i2c_start();
// send START command
i2c_write (AddressByte & 0xFE);
//WRITE Command (see Section 4.1.4 Address Byte )
//also, make sure bit 0 is cleared 0
i2c_write(0x05);
// Write T
A
Register Address
i2c_start();
//Repeat START
i2c_write(AddressByte | 0x01);
// READ Command (see Section 4.1.4 Address Byte )
//also, make sure bit 0 is Set 1
UpperByte = i2c_read(ACK);
// READ 8 bits
//and Send ACK bit
LowerByte = i2c_read(NAK);
// READ 8 bits
//and Send NAK bit
i2c_stop();
// send STOP command
//Convert the temperature data
//First Check flag bits
if ((UpperByte & 0x80) == 0x80){
//T
A
?T
CRIT
}
if ((UpperByte & 0x40) == 0x40){
//T
A
> T
UPPER
}
if ((UpperByte & 0x20) == 0x20){
//T
A
< T
LOWER
}
UpperByte = UpperByte & 0x1F;
//Clear flag bits
if ((UpperByte & 0x10) == 0x10){
//T
A
< 0癈
UpperByte = UpperByte & 0x0F;
//Clear SIGN
Temperature = 256 - (UpperByte x 16 + LowerByte / 16);
}else
//T
A
?0癈
Temperature = (UpperByte x 16 + LowerByte / 16);
//Temperature = Ambient Temperature (?/SPAN>C)
This example routine assumes the variables and I
2
C" communication subroutines are predefined
(see Appendix A: Source Code ):
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