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參數(shù)資料
| 型號(hào)： | MCP9700 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low-Power Voltage Output Temperature Sensor |
| 中文描述： | 低功耗，電壓輸出溫度傳感器 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大小： | 265K |
| 代理商： | MCP9700 |
2005 Microchip Technology Inc.
DS21942A-page 9
MCP9700/01
4.0
APPLICATIONS INFORMATION
4.1
The MCP9700/01 accuracy can be improved by
performing a system calibration at a specific tempera-
ture. For example, calibrating the system at 25°C
ambient improves the measurement accuracy to a
±0.5°C (typ.) from 0°C to 70°C, as shown in Figure 4-1.
Therefore, when measuring relative temperature
change, this family measures temperature with higher
accuracy.
Improving Accuracy
FIGURE 4-1:
vs. Temperature.
Relative Accuracy to +25°C
The relative change in accuracy from the calibration
temperature is due to the output non-linearity from the
first-order equation, specified in Equation 3-1. The
accuracy can be further improved by compensating for
the output non-linearity.
For higher accuracy, the sensor output transfer function
is also derived using a second-order equation as
shown in Equation 4-1. The equation describes the
output non-linearity. This equation is not used to
characterize the part as specified in the DC Electrical
Characteristics table; however, it provides better
accuracy.
EQUATION 4-1:
SECOND-ORDER
TRANSFER FUNCTION
4.2
Shutdown Using Microcontroller
I/O Pin
The MCP9700/01 low operating current of 6 μA (typ.)
makes it ideal for battery-powered applications.
However, for applications that require tighter current
budget, this device can be powered using a microcon-
troller Input/Output (I/O) pin. The I/O pin can be toggled
to shutdown the device. In such applications, the
microcontroller internal digital switching noise is
emitted to the MCP9700/01 as power supply noise.
This switching noise compromises measurement
accuracy. Therefore, a decoupling capacitor will be
necessary.
4.3
Layout Considerations
The MCP9700/01 does not require any additional
components to operate. However, it is recommended
that a decoupling capacitor of 0.1 μF to 1 μF be used
between the V
DD
and GND pins. In high-noise applica-
tions, connect the power supply voltage to the V
DD
pin
using a 200
Ω
resistor with a 1 μF decoupling capacitor.
A high-frequency ceramic capacitor is recommended. It
is necessary for the capacitor to be located as close as
possible to the V
DD
and GND pins in order to provide
effective noise protection. In addition, avoid tracing dig-
ital lines in close proximity to the sensor.
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-50
-25
0
25
T
A
(°C)
50
75
100
125
A
V
DD
= 3.3V
10 Samples
Where:
T
A
V
OUT
= Sensor Output Voltage
V
0°C
= Sensor Output Voltage at 0°C
(refer to Figure 2-7 and 2-10)
T
C1
= Temperature Coefficient
(refer to Figure 2-8 and 2-11)
T
C2
= Temperature Coefficient
MCP9700 1.4 μV/°C
2
(typ.)
MCP9701 2.7 μV/°C
2
(typ.)
(refer to Figure 2-9 and 2-12)
= Ambient Temperature
V
OUT
= T
C2
(T
A
+ 10°C)(125°C – T
A
) + T
C1
T
A
+ V
0°C
= -T
C2
T
A2
+ (T
C1
+ 115 T
C2
)T
A
+ 1250 T
C2
+ V
0°C
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