參數(shù)資料
型號: MCP9808T-E/MS
廠商: Microchip Technology
文件頁數(shù): 24/52頁
文件大?。?/td> 1085K
描述: IC TEMP SENSOR DGTL I2C 8MSOP
標準包裝: 2,500
功能: 溫度監(jiān)控系統(tǒng)(傳感器)
傳感器類型: 內部
感應溫度: -40°C ~ 125°C
精確度: ±1°C
拓撲: ADC(三角積分型),寄存器庫
輸出類型: 2 線串行,I²C?/SMBUS?
輸出警報:
輸出風扇:
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應商設備封裝: 8-MSOP
包裝: 帶卷 (TR)
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
2
6
2
5
2
4
bit 15
bit 8
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2
3
2
2
2
1
2
0
2
-1
2
-2
(2)
2
-3
(2)
2
-4
(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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