Microchip MCP9801 Manual

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2010-2015 Microchip Technology Inc. DS00001001C-page 1
AN1001
INTRODUCTION
Microchip Technology Inc. provides a number of analog
and serial output Integrated Circuit (IC) temperature
sensors. Typically, these sensors are accurate at room
temperature within one degree Celsius (±1°C). How-
ever, at hot or cold temperature extremes, the accuracy
decreases nonlinearly. Normally, that nonlinearity has a
parabolic shape.
This application note derives an equation to describe
the typical nonlinear characteristics of a sensor, which
is used to determine compensation for the sensor's
accuracy error over a specified range of operating tem-
peratures. A PIC® microcontroller unit (MCU) can
compute the equation and provide a temperature read-
ing with higher accuracy.
This application note is based on MCP9700 and
MCP9701 analog-output temperature sensors and
MCP9800 serial-output temperature sensors.
SOLUTION APPROACH
Silicon characterization data is used to determine the
nonlinear sensor characteristics. From this data, an
equation is derived that describes the typical perfor-
mance of a sensor. When the corresponding coeffi-
cients for the equation are determined, the coefficients
are used to compute the compensation for the typical
sensor’s nonlinearity.
The error distribution is provided using an average and
±1 standard deviation (± before and after compensa-
tion. A total of 100 devices were used as representative
for the MCP9700 and MCP9701, while 160 devices
were used for the MCP9800.
Figure 1 shows the typical sensor accuracy before and
after compensation. It illustrates that the compensation
provides an accurate and linear temperature reading
over the sensor operating temperature range.
A PIC MCU is used to compute the equation and
compensate the sensor output to provide a linear
temperature reading.
FIGURE 1: Typical Sensor Accuracy Before and After Compensation.
Author: Ezana Haile
Microchip Technology Inc.
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-55 -35 -15 5 25 45 65 85 105 125
Temperature (°C)
Typical Accuracy (°C)
Sensor Accuracy
Compensated Sensor Accuracy
IC Temperature Sensor Accuracy Compensation
with a PIC® Microcontroller
AN1001
DS00001001C-page 2 2010-2015 Microchip Technology Inc.
SENSOR ACCURACY
The typical sensor accuracy over the operating tem-
perature range has an accuracy error curve. At hot and
cold temperatures, the magnitude of the error increases
exponentially, resulting in a parabolic-shaped error
curve. The following figures show the average and ±1°C
standard deviation of the sensor accuracy curve for the
MCP9800, MCP9700 and MCP9701 sensors.
FIGURE 2: MCP9800 Accuracy
(160 parts).
FIGURE 3: MCP9700 Accuracy
(100 parts).
FIGURE 4: MCP9701 Accuracy
(100 parts).
The accuracy specification limits for these sensors are
published in the corresponding data sheets as plotted
in Figure 2, Figure 3 and Figure 4. Note that due to the
sensor nonlinearity at temperature extremes, the accu-
racy specification limits are widened. The reduced
accuracy at temperature extremes can be
compensated to improve sensor accuracy over the
range of operating temperatures.
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-55 -35 -15 5 25 45 65 85 105 125
Temperature (°C)
Accuracy (°C)
+
V
V
V
VV
Average
-
V
V
V
VV
Spec. Limit
-4.0
-2.0
0.0
2.0
4.0
6.0
-55 -35 -15 5 25 45 65 85 105 125
Temperature (°C)
Accuracy (°C)
+
V
V
V
VV
Average
-
V
V
V
VV
Spec. Limit
-4.0
-2.0
0.0
2.0
4.0
6.0
-15 5 25 45 65 85 105 125
Temperature (°C)
Accuracy (°C)
+
V
V
V
VV
Average
-
V
V
V
VV
Spec. Limit

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MCP9801

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