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AN1709 データシート(PDF) 29 Page - STMicroelectronics

部品番号 AN1709
部品情報  EMC DESIGN GUIDE FOR ST MICROCONTROLLERS
PDF  38 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1709 データシート(HTML) 29 Page - STMicroelectronics

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EMC DESIGN GUIDE FOR ST MICROCONTROLLERS
3.2.2.2 Internal Voltage Regulators (for MCUs with low power core).
An internal Voltage Regulator is used to power some ST Microcontrollers Cores starting from
the external power supply.
The Voltage Regulator reduces EMI due to the MCU Core with 2 effects:
– Lower CPU Supply Voltage
– Isolate CPU Supply from external MCU supplies.
3.2.3 Output I/O Current limitation & edge timing control
Output buffers are embedded in ST Microcontrollers, their switching speed is controlled in
order to avoid parasitic oscillations when they are switched. The MCU design makes a trade-
off between noise and speed.



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