本帖最后由 10086001 于 2024-7-8 10:58 编辑
完成
本帖最后由 10086001 于 2024-7-2 11:24 编辑
补充开源链接 https://oshwhub.com/anzre/usb-zhuan-chuan-kou
本帖最后由 冬山~ 于 2024-7-2 10:45 编辑
画完
开源链接： https://oshwhub.com/chen959/usb-uart-zi-dong-xia-zai-qi
这个图，3.3V/5V 就都有了
加上USBA
2024/7/2, 15:25 跟新原理图，原图有误
这个图 AMS1117M3-3.3,
3.3V/5V 通用，再加上 USB-TypeA 就完美了
电源线要粗，地线要粗，铺铜
电源线 100mil, 500mA ~ 800mA
已经完成
开源链接
STC8H2K08U USB转串口 - 嘉立创EDA开源硬件平台 (oshwhub.com)
神农鼎 发表于 2024-7-2 01:39
这个图 AMS1117M3-3.3,
3.3V/5V 通用，再加上 USB-TypeA 就完美了
3.3V/5V universal is nice to have, but your schematic only switches the 5V path.
Most universal is to give users more choice of operation
For USB-UART it is also useful to have P5.4 on CON4, for target RESET/DTR use cases.
This shows the problems with SOP8 package.
The overall PCB is not smaller, but the single spare pin really limits the functions.
Better would be to use SOP16, to allow RTS/CTR/DTR/DCD plus Power control options.
However, even SOP16 lacks XTALI/XTALO pins for accurate BAUD setting.
That makes TSSOP20/QFN20 the best smallest package for best performance USB-UART.
The STC8H8K64U shows DMA support on UART, lacking in STC2K08U.
The new STC8H2K32U is cheaper than STC8H8K64U, but seems to lack UART-DMA ?
速度真快{:lol:}