The **NRF24AP2-USBQ32-R7** is a highly integrated single-chip ANT™ ultra-low power wireless network solution with a built-in USB 2.0 interface. It is primarily used to bridge ANT+ sensor networks (like heart rate monitors or cycling power meters) to a PC or Mac. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | Nordic Semiconductor | | **Protocol** | ANT™ (2.4 GHz) | | **Interface** | USB 2.0 (Full Speed) | | **Package** | 32-pin QFN (5x5 mm) | | **Frequency Range** | 2400 MHz to 2483.5 MHz | | **Power Supply** | 4.0V to 5.25V (Bus-powered) | | **Sensitivity** | -85 dBm | | **Output Power** | Up to 0 dBm | --- ### 2. Core Functional Components #### A. ANT Radio Transceiver The chip features the industry-standard 2.4 GHz RF transceiver. It handles the physical layer and the complex ANT protocol stack internally, meaning the host computer doesn't need to manage timing-sensitive wireless tasks. #### B. USB Controller Unlike the standard NRF24AP2 series (which uses UART/SPI), this specific model includes an integrated USB controller. - **Plug-and-Play:** It typically acts as a Virtual COM Port (VCP) or a specific USB HID class. - **On-chip Regulator:** It contains a 3.3V regulator to power the radio from the 5V USB bus. #### C. Clocking and Crystal To operate the USB and RF stages, the chip requires a high-stability external crystal (usually **16 MHz**). The internal circuitry multiplies this for the 2.4 GHz carrier frequency and the USB data timing. --- ### 3. Pinout & Connectivity Highlights The 32-pin QFN package includes several critical groups of pins: 1. **RF Pins (ANT1/ANT2):** Differential RF output. Usually requires a balun and a matching network to connect to a PCB or chip antenna. 2. **USB Pins (D+/D-):** Direct connection to the USB connector data lines. 3. **VBUS/VDD:** Power input from the USB port. 4. **RESET:** Active-low reset pin for the MCU logic. --- ### 4. Typical Application Circuit When designing with this part, the circuit usually follows this structure: ```mermaid graph LR USB_Port -- 5V --> Voltage_Regulator[Internal LDO] USB_Port -- Data --> USB_Engine[NRF24AP2 USB Engine] USB_Engine --> ANT_Protocol_Stack ANT_Protocol_Stack --> RF_FrontEnd[RF Output] RF_FrontEnd --> Matching_Network --> Antenna ``` --- ### 5. Ordering Information (Suffix Breakdown) - **USBQ32:** Indicates the USB interface version in a 32-pin QFN package. - **R7:** Refers to the packaging format—specifically, a **7-inch reel** (usually containing 1,500 units) for automated SMT assembly.