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| 型號： | MCP9803-M/MSG |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 3Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, MO-187, MSOP-8 |
| 文件頁數(shù)： | 2/30頁 |
| 文件大小： | 478K |
| 代理商： | MCP9803-M/MSG |
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MCP9800/1/2/3
DS21909B-page 10
2004 Microchip Technology Inc.
4.3.1
AMBIENT TEMPERATURE
REGISTER (TA)
The MCP9800/1/2/3 has a 16-bit read-only ambient
temperature register
(TA) that contains 9-bit to 12-bit
temperature data. This data is formatted in two’s
complement. The bit assignments, as well as the
corresponding resolution, is shown in the register
assignment below.
The refresh rate of this register depends on the
selected ADC resolution. It takes 30 ms (typ.) for 9-bit
data and 240 ms (typ.) for 12-bit data. Since this
register is double-buffered, the user can read the
register while the MCP9800/1/2/3 performs analog-to-
digital conversion in the background. The decimal code
to ambient temperature conversion is shown in
EQUATION 4-2:
T
A
Code
2
n
×
=
Where:
n
= -1, -2, -3 and -4 for 9-bit, 10-bit, 11-bit
and 12-bit resolution, respectively
TA
= Ambient Temperature (°C)
Code= MCP980X output in decimal
(Table 4-1)
REGISTER 4-2:
AMBIENT TEMPERATURE REGISTER (TA)
Upper Half:
R-0
Sign
26 °C/bit
25 °C/bit
24 °C/bit
23 °C/bit
22 °C/bit
21 °C/bit
20 °C/bit
bit 15
bit 8
Lower Half:
R-0
2-1 °C/bit
2-2 °C/bit
2-3 °C/bit
2-4 °C/bit
0
bit 7
bit 0
Note:
When the 9-bit, 10-bit or 11-bit resolutions are selected, bit 6, bit 7 or bit 8 will remain clear <0>,
respectively.
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
TABLE 4-1:
AMBIENT TEMPERATURE TO CODE CONVERSION
Ambient Temperature
Code
TA
(°C)
9-Bit
10-Bit
11-Bit
12-Bit
Binary
Hexadecimal
Decimal
+125°C
0111 1101 0uuu uuuu(1)
0FA
250
+125
+25.4375°C
0001 1001 0uuu uuuu
032
50
+25
+0.5°C
0000 0000 1uuu uuuu
001
1
+0.5
+125°C
0111 1101 00uu uuuu
1F4
500
+125
+25.4375°C
0001 1001 01uu uuuu
065
101
+25.25
+0.25°C
0000 0000 01uu uuuu
001
1
+0.25
+125°C
0111 1101 000u uuuu
3E8
1000
+125
+25.4375°C
0001 1001 011u uuuu
0CB
203
+25.375
+0.125°C
0000 0000 001u uuuu
001
1
+0.125
+125°C
0111 1101 0000 uuuu
7D0
2000
+125
+25.4375°C
0001 1001 0111 uuuu
197
407
+25.4375
+0.0625°C
0000 0000 0001 uuuu
001
1
+0.0625
0°C
0000 0000 0000 uuuu
000
0
–0.0625°C
1111 1111 1111 uuuu
(
2)
001
(
3)
-1
-0.0625
–25.4375°C
1110 0110 1001 uuuu
197
-407
-25.4375
–55°C
1100 1001 0000 uuuu
370
-880
-55
Note
1:
‘u’ represents unused bits. The MCP9800/1/2/3 clears <0> the unused bits.
2:
This data is in two’s complement format, which indicates ambient temperature below 0°C.
3:
Negative temperature magnitude in Hexadecimal. This conversion is done by complimenting each binary bit and
adding 1.
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