USB-C SD Card Reader Design

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This board is a self-contained USB-C dongle that simultaneously acts as a USB 3.1 mass-storage device and a phone charger:
  • Phone interface (device mode)
    • J4 is the board-mounted USB-C male plug into your iPhone.
    • Its CC pins have pull-down resistors (R9, R10) so the phone knows it’s a device.
    • D+/D– and SuperSpeed pairs go through series resistors and ESD diodes (U4–U7) into the USB 3.1 bridge (U2), which presents a microSD socket (J3) as a standard mass-storage drive.
  • Power-delivery input (sink mode)
    • J1 is repurposed as a USB-C PD input. Its CC lines feed the PD controller (U1), negotiating at least 5 V/3 A.
    • Bulk caps (C29) stabilize the input.
    • The negotiated 5 V is switched through U3 (load switch) and fed back to [J4]’s VBUS to charge the phone.
  • Protections & cleanup
    • ESD diodes on both connectors guard against voltage spikes.
    • All grounds are tied to a common GND plane.
    • J2 was removed to prevent any USB-C cross-talk.
53 days

Plan completed.

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Inspect

Above Copper Battle Mech

Above Copper Battle Mech
Created
Last updated by hannietansanhill924946
2 Contributor(s)
antonybasta
hannietansanhill924946

Controls

Properties

V

A

V

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