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README.md

the PD blocker removes Power Delivery (PD) capabilities from USB-C connections

purpose

some USB-C devices do not require the Power Delivery features available on the connector, mainly higher voltage and current. the device might not even be rated for higher voltages. mischievous eMarked cables (with PD-capable chips built in) or chargers might raise the voltage without the device requesting it. the higher voltage could then damage the device.

the PD blocker protects your [expensive] USB-C device from such damages.

usage

insert the PD blocker in line between the power source (e.g. charger or host computer) and the cable connecting your device. this is the ideal position to also safeguard against mischievous eMarked cables, still being able to use them. else you can also insert the PD blocker between your device and the cable or power source. your device will still be protected against mischievous eMarked cables, but you won't be able to use them.

all other features of USB-C are preserved (e.g. USB2, USB3, USB4, SBU, orientation detection) some alternate modes requiring PD communication will not work anymore though.

mode of operation

to prevent PD communication, capacitors are placed on the CC lines. they smooth out the 300 Kbps BMC signal used for PD communication. it still allows the identification of Rp, Rd, and Ra used for orientation and role detection.

an additional circuit will cut the power when VBUS exceeds 5.5V (on either side of the PD blocker).

warning

the PD blocker can block up to 36V. PD rev 2.0 specifies voltages up to 20V. PD rev 3.0 specifies voltages up to 48V, but I haven't seen any power source using this new capability yet.