Nowadays, mobile phone OTG applications are increasing day by day. So I made this mobile phone OTG-HUB.
Use the HUB component SL2.1A on sale in the mall, the USB card reader chip GL823K on sale, and other components that are currently out of stock.
OTG-HUB uses 1 minute 3 mode, connects to the mobile phone through the TYPEC plug, and recognizes the OTG mode.
Expand to 3-way USB through SL2.1A. Route 1 is unused due to layout reasons.
One of them is used by the card reader chip GL823K. The card holder uses a small clamshell type.
The other two channels are led out through two TYPEC interfaces in different directions. You can connect more external USB devices, such as mouse and keyboard.
Details of the project have been released on Digital Home, link: https://www.mydigit.cn/forum.php?mod=viewthread&tid=147230
Hang up the current test, the no-load and the on-board TF card are loaded with the same current. More interesting. Reading more cards does not increase the current.
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