The project is still under development ... check back for more detail update.

Project Status

We are evaluating the prototype stability and temperature at higher voltage.

Libraries

• AP33772S Arduino - GitHub <- Pending update
• AP33772S RP2040 Cpp - GitHub <- Pending update
• AP33772S PicoSDK - GitHub <- Pending update

Description

With the continuous improvement from the previous generation of RotoPD, our RotoPD Pro leverages advanced power delivery protocols 3.1 to achieve a full specification output range— 4.5V to 48V at 240W max. The breakout board use a stand alone Power Delivery Sink controller to negotiate with your modern charger and provide different output voltage.

Standard trigger board can select fix voltage like 5V, 9V, 15V, 20V, and 28V. Centylab's RotoPD Pro unlock more advance mode in your USB-C power supplies like Programmable Power Supply (PPS) and Adjustable Voltage Supply (AVS), to provide even more granular voltage adjustment. The RotoPD simplifies power negotiation with USB-C adapters, handling the complex process of establishing power delivery contracts. The controller does all the heavy lifting of power negotiation and provides an easy way to configure over I2C, free your micro-controller from the complicated USB-C PD protocol.

To config the board, you will need an I2C bus. The board integrates seamlessly into the Qwiic and STEMMA QT ecosystems, no soldering is required. The board only work with 3.3V or 1.8V I2C logic.

To make it even easier to use, RotoPD includes a built-in buck converter that efficiently steps down USB-C VBUS power to a stable 5V output, making it perfect for powering microcontrollers, sensors, and other low-voltage components in your project.

Technical specification

• USB PD chip: AP33772S
• Current sensor: INA238
• USB-C voltages: from 4.5V to 48V
• Maximum current: 5 A
• Maximum power: 240W (48 V at 5 A)
• Aux power: 5V@0.4A
• Configuration: via I2C
• Connectors: USB Type-C, headers, Qwiic/STEMMA QT
• Weight: 6 g

Features

• Input and output voltage range of  48V at 5A max
• On board buck for 5V output at 1A max, 0.4A continuous
• Support Qwiic or STEMMA QT in 3.3V Only
• Support PD3.1 EPR/AVS Up to 48V and SPR/PPS Up to 21V
• Certified USB PD3.1 v1.6  TID: 10062
• Integrated ESD and flyback diode protection
• Integrated NTC temperature monitoring
• On board VBUS switch (back-to-back NMOS)

<Table showing different between RotoPD and RotoPD Pro>

EPR/AVS Power Supplies

As the technology is getting more adoption, as March 2026, here are some charger/power bank reported to provide AVS voltage adjustment.

Framework 180W

Framework 240W

Anker Prime Charger 160W (A2687)

UGREEN Nexode 300W

Demo

Here is a sneak peak of the hardware spider web for our prototype. We are requesting 48V in AVS profile.