usb转ttl ch340g原理图

根据引用和引用的信息，USB转TTL芯片CH340G的原理图如下所示：

[描述CH340G原理图的文字说明]

根据引用中所提到的电路原理，CH340G芯片的引脚连接如下：
- CH340G的VCC连接单片机的电源引脚
- CH340G的GND连接单片机的地线
- CH340G的TXD连接单片机的RXD引脚
- CH340G的RXD连接单片机的TXD引脚
- CH340G的DTR连接单片机的复位引脚
- CH340G的RTS连接单片机的BOOT0引脚

这样，通过USB转TTL芯片CH340G，可以实现STM32的自动ISP下载。

请注意，这只是一个概括性的描述，具体的原理图需要参考CH340G芯片的数据手册以及单片机的引脚定义来进行设计和连接。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *3* [图解单片机下载程序电路原理之USB转串口线、CH340、PL2303、MAX232芯片的使用！](https://blog.csdn.net/dcx1205/article/details/10818729)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* [ch340g电路图5v和3.3v供电电路](https://blog.csdn.net/chenhuanqiangnihao/article/details/118395189)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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