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MCP9502 数据表(PDF) 10 Page - Microchip Technology

部件名 MCP9502
功能描述  Temperature Switch with Selectable Hysteresis
PDF  20 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP9502 数据表(HTML) 10 Page - Microchip Technology

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MCP9501/2/3/4
DS22268A-page 10
© 2011 Microchip Technology Inc.
4.1.2
POWER SUPPLY REJECTION
The MCP9501/2/3/4 family does not require any
additional components. However, it is recommended
that a decoupling capacitor of 0.1 µF to 1 µF be used
between the VDD and GND pins. A high-frequency
ceramic capacitor is recommended. It is necessary for
the capacitor to be located as close as possible to the
power pins in order to provide effective noise
protection.
FIGURE 4-5:
Power-supply Filter using a
Single Resistor.
For applications where a switching regulator is used to
power the sensor, it is recommended to add a 200
Ω
resistor in series to VDD to filter out the switcher noise.
It is also recommended to add the series resistor in
applications where a linear regulator is used to
step-down a switching regulator voltage to power the
sensor, as shown in Figure 4-5. For example, if a
linearly regulated 3.3V from a 5V switching regulator is
used to power the sensor, add a 200
Ω series resistor.
The MCP9501/2/3/4 family of sensors is designed to
prevent false output trigger due to high frequency
power supply or system noise. Figure 4-6 shows the
device performance with a high frequency signal added
on VDD. The output is not triggered due to the signal
added
on
VDD. With some applications, it is
recommended to add a bypass capacitor of 0.1 µF to
1µF.
FIGURE 4-6:
Power Supply Rejection.
VDD
200
Ω
MCP9501/2/3/4
Switching
Regulator
0.1 µF
bypass
VDD
200
Ω
MCP9501/2/3/4
Switching
Regulator
0.1 µF
bypass
Regulator
Linear
0
1
2
3
4
5
6
10
100
1000
10000
100000
1000000
10000000
O
u
tp
u
t
V
o
lt
a
g
e
(V
)
Frequency (Hz)
MCP9501/2/3/4 TSET = 25\ C Power Supply Rejection
No False Trigger
1
0
k
1
0
0
k
1
M
1
0
M
1
k
1
0
0
1
0
VDD = 5V + 400mVAC
VDD = 5V + 400mVSQR
TSET = 25\ C
T
A = 23\ C
°
°
°
Frequency (Hz)



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