Compute Module • Using Official Raspberry Pi 5 Power Supply with Type-C Socket – Do I Need 5.1kΩ Resistor?

I’m building a portable UPS-powered system using a Raspberry Pi 5, and I’d like some help figuring out the power connections.

My setup uses a SEYVUM 20V MAX 2.0Ah Lithium-Ion Battery-Pack connected through a 5V–48V 10A DC Backup Battery Module and a DC 12V/24V to 5V USB-C Step Down Converter (5A, 25W). This provides a stable 5V output to power the Pi.

I plan to connect the output to a USB Type-C socket connector, which has only two wires: power (plus) and ground (minus).

In addition to the Raspberry Pi 5, my system will power:

A screen via USB-A

An NVMe SSD

A Blu-ray drive

A floppy drive

A Bluetooth keyboard and mouse

I read that some USB Type-C power setups need a 5.1kΩ resistor between the CC1 pin and ground to work properly if both ends of the cable are Type-C.

So my questions are:

Since my Type-C socket only has power and ground wires, do I need to add a 5.1kΩ resistor for the official Raspberry Pi 5 power supply to work safely?

Has anyone built a similar UPS system using the official Pi 5 power supply and a Type-C socket?

Is there any risk of damaging the Pi or power supply if I don’t include the resistor?

Statistics: Posted by monsoon — Tue Jul 15, 2025 11:55 pm

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