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| 型号： | MCP9808-E/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 24/52页 |
| 文件大小： | 1085K |
| 描述： | IC TEMP SENSOR DGTL I2C 8MSOP |
| 标准包装： | 100 |
| 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： | 管件 |
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MCP9808
DS25095A-page 24
?2011 Microchip Technology Inc.
5.1.3
AMBIENT TEMPERATURE
REGISTER (T
A
)
The MCP9808 uses a band gap temperature sensor
circuit to output analog voltage proportional to absolute
temperature. An internal 敚 ADC is used to convert the
analog voltage to a digital word. The digital word is
loaded to a 16-bit read-only Ambient Temperature
register (T
A
) that contains 13-bit temperature data in
twos complement format.
The T
A
register bits (T
A
<12:0>) are double-buffered.
Therefore, the user can access the register, while in the
background, the MCP9808 performs an Analog-to-
Digital conversion. The temperature data from the 敚
ADC is loaded in parallel to the T
A
register at t
CONV
refresh rate.
In addition, the T
A
register uses three bits (T
A
<15:13>)
to reflect the Alert pin state. This allows the user to
identify the cause of the Alert output trigger (see
Section 5.2.3 Alert Output Configuration ); bit 15 is
set to 1 if T
A
is greater than or equal to T
CRIT
, bit 14 is
set to 1 if T
A
is greater than T
UPPER
and bit 13 is set to
1 if T
A
is less than T
LOWER
.
The T
A
register bit assignment and boundary
conditions are described in Register 5-4.
REGISTER 5-4:
T
A
: AMBIENT TEMPERATURE REGISTER (?/SPAN> ADDRESS 0000 0101b)
(1)
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
T
A
vs. T
CRIT
(1)
T
A
vs. T
UPPER
(1)
T
A
vs. T
LOWER
(1)
SIGN
2
7
癈
2
6
癈
2
5
癈
2
4
癈
bit 15
bit 8
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2
3
癈
2
2
癈
2
1
癈
2
0
癈
2
-1
癈
2
-2
癈
(2)
2
-3
癈
(2)
2
-4
癈
(2)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as 0
-n = Value at POR
1 = Bit is set
0 = Bit is cleared
x = Bit is unknown
bit 15
T
A
vs. T
CRIT
bit
(1)
0 = T
A
< T
CRIT
1 = T
A
e T
CRIT
bit 14
T
A
vs. T
UPPER
bit
(1)
0 = T
A
d T
UPPER
1 = T
A
> T
UPPER
bit 13
T
A
vs. T
LOWER
bit
(1)
0 = T
A
e T
LOWER
1 = T
A
< T
LOWER
bit 12
SIGN bit
0 = T
A
e 0癈
1 = T
A
< 0癈
bit 11-0
T
A
: Ambient Temperature bits
(2)
12-bit ambient temperature data in twos complement format.
Note 1: Bits 15, 14 and 13 are not affected by the status of the Alert Output Configuration (CONFIG<5:0> bits,
Register 5-2).
2: Bits 2, 1 and 0 may remain clear at 0 depending on the status of the Resolution register (Register 5-7).
The power-up default is 0.25癈/bit; bits 1 and 0 remain clear 0.
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