USB3.0 card reader based on PL2731 solution supports camera SD card

Portal of 3.0 card readers with the same series and board type but different main control solutions↓↓↓↓↓↓↓
Genesys GL3224 solution (white solder mask has been completed and verified)
Wangjiu PL2731 solution (black solder mask has been completed and verified) (the project on the current page)
Refatech NS1081 solution (the hardware has been completed, but the firmware cannot be found)
Genesys GL3233 solution (considering the solution, collecting information)
Realtek RTS5306e (considering the solution, collecting information)
 
 
····Introduction····
This project is made using Wangjiu Technology PL2731 solution, supports USB3.0 transmission, supports UHS-I specification SD cards, reserves external Flash pads, and can upgrade the firmware later.
The card reader is tested with Kingston 256G blue card and Samsung ProPlus 128G red card (2019 version), and the reading speed can reach about 90-100M/s.
This project should be regarded as the fourth USB3.0 card reader solution on the open source platform. I hope that there will be more people who will come up with more tricks based on PL2371 in the future.
 
····Details····
The input uses Micro-B3.0 interface, and ordinary mobile hard disk data cable can be used, or you can buy one for a few dollars on Taobao. For long cables, you can buy the original cable of Samsung S5 or Note3.
PL2731 I personally think this solution is very similar to GL3224, low cost, similar reading and writing speed performance, but it needs external LDO power supply, but the chip seems to be cheaper than 3224 on Taobao.
The power supply part uses XC6206 LDO as 1.3V and 3.3V output to supply the main control chip. The use of this LDO is determined after considering the material price, purchase difficulty, and package size. You can also replace it with your own commonly used one.
The main control chip supports the chip's own 1.2V power supply and external 1.2V (but 1.3V is required in the official schematic) power supply. Using external power supply can reduce the chip temperature when USB3.0 is working. External power supply is used by default in this project.
The SD card slot used in this project fully supports write protection recognition. If the card slot you bought does not support it, you need to manually fly the write protection pin to GND, otherwise the data cannot be written normally.
Q&A↓
Q Why not use Type C?
A The adapter chip has multiple places and is quite expensive. The full-pin C port is not easy to weld. Moreover, I am a user who has both C and Micro-B3.0 devices. The priority is convenience for myself. If you mind, you can change it to C port yourself.
Q Why is there no small TF card version?
A I am a photography user and I use SD cards, so I don’t draw TF cards. If you need to add a card holder adapter, you can use it.
Q Why not make A port direct plug?
A The original intention of making this card reader is to avoid having to get up and get close to the chassis to fight with a bunch of interfaces. I always have C-port and Micro-B3.0 port cables extending to the keyboard on my desk, so I can operate them without getting up. The priority is convenience for myself. If you are more concerned, you can draw an A-port one yourself.
 
····Test picture····
The performance of this solution is basically the same as GL3224, so I won’t do a detailed test. The card is Samsung ProPlus128G 2019 version, reading speed.
 
····BOM picture····
BOM will be added in the PCB file, the one with the suffix xxxxxxBOM is it.
 
····Actual picture····