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#The7thLiChuangElectricityContest#USB current measurement

Overview

National Technology N32 MCU
USB Power Meter
Lichuang Summer Camp
Power Indicator
There are two LEDs, one 3.3V and one 5V
Voltage conversion
XC6220B331MR-G is used to step down the input 5V voltage to 3.3V to power the MCU and current detection chip Current

detection
INA199
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Voltage detection
Simple resistor voltage division
It must be noted that the voltage must be less than 3.3V (VADC)
The extended UART port can be used to transmit data

There is a 0Ω resistor in the schematic diagram to isolate GND.
The following link talks about the role of 0Ω resistor
https://www.bilibili.com/read/cv15681591/

Design Files

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