The **ZG-RPD11** is a specialized power management module, commonly referred to as a **USB-C PD (Power Delivery) Trigger or Decoy board**. Its primary function is to communicate with a USB-C PD charger and "trick" it into outputting a specific voltage (such as 9V, 12V, 15V, or 20V) to power non-USB devices. --- ## 1. Core Electronic Components The ZG-RPD11 consists of several surface-mount device (SMD) components that work together to negotiate power levels. | Component | Description | Function | | :--- | :--- | :--- | | **PD Controller IC** | The brain of the board (often a CH224K or similar). | Handles the CC1/CC2 handshake protocol with the charger. | | **Voltage Selection Pads** | Small solder bridges labeled A, B, and C (or similar). | Allows the user to hardware-program the desired output voltage. | | **USB-C Female Port** | 24-pin physical interface. | Receives the input power and communication lines from the source. | | **Output Terminals** | Solder pads (+ and -). | Connects to the load (your project/device). | | **Capacitors** | Small ceramic decoupling capacitors. | Filters noise and stabilizes the output voltage. | --- ## 2. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Interface** | USB Type-C | | **Supported Protocols** | PD 2.0 / PD 3.0 | | **Output Voltages** | 5V, 9V, 12V, 15V, 20V | | **Max Current** | Up to 5A (Dependent on the charger and cable rating) | | **Dimensions** | Approx. 10mm x 18mm (Micro-form factor) | --- ## 3. How it Works (The PD Handshake) 1. **Connection:** When plugged into a PD charger, the **PD Controller IC** initiates communication via the **CC (Configuration Channel)** pins. 2. **Negotiation:** The board sends a request for a specific voltage profile (e.g., "Give me 12V"). 3. **Validation:** If the charger supports that voltage, it switches its internal buck-boost converter to that level. 4. **Output:** The voltage is then passed through to the positive and negative output pads on the back of the ZG-RPD11. --- ## 4. Setting the Voltage The ZG-RPD11 uses a **resistor-divider or bridge configuration** to set the target voltage. By shorting or leaving open specific pads on the PCB, you "program" the chip's logic: * **12V:** Usually requires a specific bridge configuration. * **20V:** Usually requires all pads to be open or shorted depending on the specific revision of the ZG-RPD11. * **Note:** If the requested voltage is not supported by the charger, the board will default to the next lowest available voltage (or 5V). ---