Introduction to the WCH CH32V003F4P6 Microcontroller

Core Identity: The Cost-Effective RISC-V Powerhouse

• Core Architecture: QingKe RISC-V2A core.

  • Significance: This is a microcontroller based on the open-source instruction set RISC-V, representing the trend toward high efficiency and low cost, moving away from traditional ARM architecture in this segment.

• Manufacturer: WCH (Nanjing Qinheng Microelectronics).

• Primary Feature: It offers sufficient performance at an extremely low price point (often below US$ 0.20 in volume), making it ideal for high-volume, cost-sensitive, or disposable IoT products.

Key Reasons for SLBB Selection (DFM & Cost KPIs)

We chose this chip based on our DFM (Design for Manufacture) and Cost KPI (K2) goals:

1. Cost Advantage (K2): It is one of the lowest-priced MCUs available that meets our performance and packaging needs. This directly enables us to meet our [K2] Standard Brick BOM Cost target of under US$2.00.

2. Space Efficiency: The TSSOP-20 package is significantly smaller than common alternatives, freeing up vital board space on our tiny PCB for routing and the non-plated magnet holes.

3. Single-Wire Programming (SDI): It only requires 3 pads (GND, VCC, PD1 (SDI)) for flashing. This flawlessly supports our strategy of removing all external connectors and using the 3-Pad programming jig for the factory.