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STC51 and STM32 downloader

Overview

The STC51 and STM32 downloaders have been reduced in size this time to add a small-volume polymer lithium battery and a hardware manual cold start download switch. They hope to enable program downloading of all STC microcontrollers and integrate the STM32 microcontroller TTL one-click automatic download circuit.

Because it is a reintegration of the previous circuit, the working principle of the circuit will not be explained anymore. Here are the links to the STC51 downloader and STM32 one-click downloader:

STC51 downloader: https://maker.lceda.cn/p/583703056a/51-dan-pian-ji-xia-zai-qi

STM32 one-click downloader: https://maker.lceda.cn/p/583703056a/ch340c-stm32f103c8t7

The following mainly explains the lithium battery charging circuit and boost circuit: Lithium battery charging.png

Red circle 1 TP4057 lithium battery charging circuit, this chip has reverse connection protection

Red circle 2 PS7516 lithium battery boost circuit, the output voltage setting should not be higher than 5V

Red circle 3 automatically turns off the lithium battery boost circuit when plugged into USB for charging

Red circle 4 is a switch that controls the lithium battery boost. Its function is to turn off the 5V boost when not charging to save the power of the lithium battery.

Several toggle switches are added to the downloader. SW1 is an upgrade switch for the STC51 offline downloader.

SW2 is the STC51 downloader's automatic download and manual download switch for external microcontrollers.

SW3 is the offline download trigger switch.

SW4 is a switch used to select whether to supply 5V or 3V power to the external STC51 microcontroller.

SW5 is a manual cold start download switch for the STC51 microcontroller.

PCB blank board

TOP Layer:

TOP Layer.png

BOTTOM Layer: BOTTOM Layer.jpg

Welded PCB board-TOP Layer:

Soldering PCB-TOP Layer.jpg

Welded PCB board-BOTTM Layer:

Welding BOTTOM Layer.jpg

The shell cannot be finished until the 3D printer is available. The files for the 3D printed shell will be in the attachment. I haven’t been in the mood to draw the shell file recently. If someone who can draw shells sees it, please contact me or leave your QQ number. , my QQ number-583703056

Test video link:

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

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:2025-05-08 20:54:43

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