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| 型号： | MCP9502PT-095E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SWITCH PROGR P-P SOT23-5 |
| 标准包装： | 1 |
| 感应温度： | 95°C 分界点 |
| 输出类型： | 高态有效/推挽式 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 精确度： | ±1°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | MCP9502PT-095E/OTDKR |
MCP9501/2/3/4
4.1.2
POWER SUPPLY REJECTION
The MCP9501/2/3/4 family of sensors is designed to
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 V DD 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
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 V DD . The output is not triggered due to the signal
added on V DD . With some applications, it is
recommended to add a bypass capacitor of 0.1 μF to
1 μF.
protection.
6
MCP9501/2/3/4 T SET = 25 ° C Power Supply Rejection
(
p 2
Switching
Regulator
200 Ω
0.1 μF
bypass
MCP9501/2/3/4
V DD
MCP9501/2/3/4
) 5
V
e 4
g
ta l
o 3
V
t
u
t
u
O
1
No False Trigger
V DD = 5V + 400mV AC
V DD = 5V + 400mV SQR
°
T SET = 25 ° C
T A = 23\C
1
0
k k
1 Frequency (Hz)
0
M
1
Switching
Regulator
200 Ω
Linear
Regulator 0.1 μF
V DD
0
10
0
100
0
1
1000
10000 100000
0
1
Frequency (Hz)
k
0
1
1000000
M
1
10000000
0
bypass
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 V DD 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.
DS22268A-page 10
FIGURE 4-6:
Power Supply Rejection.
? 2011 Microchip Technology Inc.
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