Contents
Overview
With the USB-PD Decoy, a USB-C power adapter can be used as a power supply with the option of selecting different output voltages via DIP switches. It is based on the cheap and easy-to-use CH224K multi-fast charging protocol power receiving chip.
Introduction
A USB Power Delivery (PD) decoy is a device designed to manipulate or emulate USB PD negotiation during the charging process. USB PD is a protocol that allows for faster charging and power negotiation between devices. A decoy device can be used for various purposes, including testing, analysis, or even security research.
Here are a few potential use cases for a USB PD decoy:
- Security Research: Security researchers may use USB PD decoy devices to analyze the security of USB PD implementations. This can include testing for vulnerabilities or weaknesses in the protocol.
- Testing and Development: Engineers and developers may use USB PD decoys to test how devices behave in different charging scenarios. This can be useful for debugging and ensuring compatibility with various chargers and power sources.
- Custom Power Negotiation: Some enthusiasts may use USB PD decoys to customize the power negotiation process between devices. This could involve tweaking parameters to achieve specific charging profiles or behaviors.
- Education and Learning: USB PD decoy devices can be valuable tools for educational purposes, allowing students and enthusiasts to learn about the intricacies of USB PD communication.
It’s important to note that the use of USB PD decoy devices should comply with relevant laws and ethical considerations. Additionally, these devices should be used responsibly and not for any malicious activities.
Working Principle
The CH224K integrates multiple fast charging protocols such as USB PD3.0/2.0, BC1.2 and other boost fast charging protocols on a single chip. It features:
- 4V to 22V input voltage
- PD3.0/2.0, BC1.2 and other fast charging protocols
- USB Type-C PD, positive and negative insertion detection and automatic switching
- E-Mark simulation, automatically detect VCONN, support 100W power PD request
- requested voltage can be dynamically adjusted through a variety of methods
- high integration of single chip, simplified peripheral and low cost
- built-in over-voltage and over-temperature protection module
The output voltage can be selected via the DIP switches as follows:
| Output Voltage | SW1 | SW2 | SW3 |
|---|---|---|---|
| 5V | 0 | – | – |
| 9V | 1 | 1 | 1 |
| 12V | 1 | 1 | 0 |
| 15V | 1 | 0 | 0 |
| 20V | 1 | 0 | 1 |
The Power-Good LED lights up when the selected voltage has been successfully negotiated with the USB-C power adapter and is present at the output. The voltage can also be changed during operation.
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