4 layers93.5 × 94.5 mm
RC Buggy
TheFlocke/rc-buggy
Autonomous rover with BLE control and robotic arm, built for a DLR high school competition.
162 partsGPL-3.0
2 layers24.4 × 35.8 mm
RotoPD
CentyLab/RotoPD176Repo for RotoPD hardware and documentation
- Size
- 24.4 × 35.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 39
- Pads
- 167
- Tracks, vias
- 272, 68
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Mar 2025
- Updated
- 20 Aug 2025
Overview
RotoPD is an open-source printed circuit board by CentyLab, from the CentyLab/RotoPD repository on GitHub. It is a 2-layer board of 24.4 × 35.8 mm with 44 parts on 39 nets, routed with 272 tracks and 68 vias.
It is built around the AON7262E, BSS138 and TPD4E05U06DQAR. Its parts include 16 resistors, 9 capacitors, 4 ICs, 4 diodes and 4 connectors.
Main components
3
AON7262E
DFN-8(3x3)-55℃~+150℃ 1 N-channel 1.652nF 10mΩ@10V 2.2V 34A 43W 45nC@10V 520pF 52pF 60V N-Channel DFN-8(3x3) MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
TPD4E05U06DQAR
USON-10-40℃~+125℃ 0.5pF 10nA 14V 2.5A@8/20us 40W@8/20us 5.5V 6.5V ESD Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Unidirectional USON-10(1x2.5) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD Protection Devices
README
Readme.mdRotoPD - USB-C PD 3.1 Breakout I2C
Libraries
- AP33772S Arduino - GitHub
- AP33772S Arduino RP2040 - GitHub
- AP33772S CircuitPython - GitHub -> Thanks to hansendc
- AP33772S PicoSDK - GitHub
- AP3372S-rs Rust Driver - GitHub/Crates.io
You can install the library directly on ArduinoIDE
Description
While traditional power adapters can provide a variety of current but fixed to 5V output, our RotoPD leverages advanced power delivery protocols to achieve a versatile output range— 3.5V to 30V at 150W max. The breakout board use a stand alone Power Delivery Sink controller to negotiate with your modern charger and provide different output voltage.
Centylab's RotoPD can 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. We also include an logic level shifter on board to work with 3.3V or 5V I2C system.
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 2A output, making it perfect for powering microcontrollers, sensors, and other low-voltage components in your project.
Requirements for AVS
To ultilize AVS power profile, you will need a powerbank or charger that has AVS profile and a 240W USB-C cable. Here are some chargers that we found support AVS profile.
Specification
- Input and output voltage range of 3.5-30V at 5A max
- 5V output at 2A max
- Support Qwiic or STEMMA QT in both 3.3V and 5V I2C
- Support PD3.1 EPR/AVS Up to 30V and SPR/PPS Up to 21V
- Integrated ESD and flyback diode protection
- Integrated VBUS voltage/current monitoring
- Integrated on-board NTC temperature monitoring
- Integrated VBUS switch gate drivers (back-to-back NMOS)
- Status LED for Different Negotiation Results
- Certified USB PD3.1 v1.6 TID: 10062
Pinout
Demo
AVSFixed example with Sparkfun Pro Micro ESP32-C3. We are requesting AVS 28V.
Parts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2, R6, R7, R10, R11, R13, R15 |
| 5 | 10k | Resistor_SMD:R_0402_1005Metric | R3, R4, R9, R14, R18 |
| 3 | 100nF | Capacitor_SMD:C_0402_1005Metric | C2, C8, C10 |
| 2 | 10u | Capacitor_SMD:C_1206_3216Metric | C3, C6 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C4, C5 |
| 2 | AON7262E | Transistor_MOSFET:DFN-8(3.3x3.3) | U4, U6 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1, Q2 |
| 2 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5_DIN965_Pad_TopBottom | H1, H2 |
| 2 | RED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 27R | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 3.3u | Inductor_SMD:L_Bourns_SRP7028A_7.3x6.6mm | L1 |
| 1 | 33n | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 52.3k | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 5m | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | AP33772S | Interface_USBC:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U5 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | D_Schottky | Diode_SMD:D_SMA | D3 |
| 1 | LOGO | Logo:CentyLab_logo | G*** |
| 1 | QWIIC | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J2 |
| 1 | Screw_Terminal_5mm | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J3 |
| 1 | TPD4E05U06DQAR | Diode_TVS:SON50P100X255X50-10N | D4 |
| 1 | TPS62933DRLR | Power_Converter:SOT583 | U3 |
| 1 | Thermistor_NTC | Resistor_SMD:R_0402_1005Metric | TH1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USBC:USB_C_GSwitch | J1 |
Questions
How big is the RotoPD PCB?
It measures 24.4 × 35.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the RotoPD use?
44 parts, built around the AON7262E, BSS138 and TPD4E05U06DQAR. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the RotoPD KiCad files?
From the CentyLab/RotoPD repository on GitHub, at the commit this page was made from: the board is Hardware/RotoPD.kicad_pcb and its schematic Hardware/RotoPD.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the RotoPD design in my own project?
Its repository states no licence, so its author keeps all rights: ask CentyLab before reusing the design.
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