toothache

51 microcontroller automatic programmer

Overview

The main method to implement automatic download is to implement automatic cold start:

USB to serial port chips such as CH430G/E have a TNOW pin, which is generally low level. At this time, the RT9013 DC-DC power supply chip does not work, and the microcontroller is in a power-off state. When the serial port is recording, The serial port sends request data. At this time, the TNOW pin is high level. At this time, the RT9013 chip starts to work and the microcontroller is powered on, thus realizing a cold start.

Note: In order to be more reliable during circuit design, this project connects a pull-down capacitor to the TNOW pin. The purpose of this capacitor is to add a delay.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-08-06 01:00:07

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