MCP9800A0-M/MS MICROCHIP [Microchip Technology], MCP9800A0-M/MS Datasheet - Page 16

• Manufacturer Part Number: MCP9800A0-M/MS
• Description: 2-Wire High-Accuracy Temperature Sensor
• Manufacturer: MICROCHIP [Microchip Technology]

MCP9800/1/2/3
5.3.1
The MCP9800/1/2/3 has a 16-bit read-only Ambient
Temperature register that contains 9-bit to 12-bit
temperature data. (0.5°C to 0.0625°C resolutions,
respectively).
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 (typical) for
9-bit data and 240 ms (typical) for 12-bit data. Since
this register is double-buffered, the user can read the
register
Analog-to-Digital conversion in the background. The
decimal code to ambient temperature conversion is
shown in
REGISTER 5-2:
DS21909C-page 16
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
Note 1:
Upper Half:
Lower Half:
2
-1
Sign
R-0
R-0
°C/bit
Equation
while
When the 0.5°C, 0.25°C or 0.125°C resolutions are selected, bit 6, bit 7 or bit 8 will remain clear <0>,
respectively.
AMBIENT TEMPERATURE
REGISTER (T
This
5-2:
the
2
2
R-0
R-0
-2
6
data is
AMBIENT TEMPERATURE REGISTER (T
°C
°C
MCP9800/1/2/3
A
)
W = Writable bit
‘1’ = Bit is set
formatted
2
2
R-0
R-0
-3
5
°C
°C
in
performs
2
two’s
2
R-0
R-0
-4
4
°C
°C
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
2
EQUATION 5-2:
R-0
R-0
3
Where:
0
°C
A
) – ADDRESS <
Code = MCP9800 output in decimal
T
A
2
R-0
R-0
2
0
= Ambient Temperature (°C)
°C
T
A
=
 2010 Microchip Technology Inc.
Code 2
x = Bit is unknown
0000 0000
2

R-0
R-0
1
0
°C
4 –
>b
2
R-0
R-0
0
0
°C
bit 8
bit 0