SF32LB52-DevKit-Core-3p3¶

Overview¶

The SF32LB52-DevKit-Core-3p3 is a compact 3.3V development board for direct evaluation of SF32LB52x chips. It exposes the main MCU signals through edge headers, supports solderless use through castellated-style header holes, and is aimed at engineers who want broad access to GPIO, serial buses, display signals, audio, ADC, PWM, and power rails.

The board is only 30.88mm x 68mm, making it small enough for breadboard-style prototypes while still providing a practical set of interfaces for SF32LB52x firmware and hardware bring-up.

Board Variants¶

Use the NOR-only variants for compact Bluetooth, control, and simple HMI work. Use the PSRAM + external NOR variants when the application needs larger graphics assets, frame buffers, file systems, or application storage.

The original source identifies the R16N16 V1.0.0 configuration as the current version. Confirm the actual marking on the board before selecting a matching firmware target.

Board Highlights¶

• SF32LB52x MCU variants with NOR-only or PSRAM + NOR configurations
• 48MHz main crystal and 32.768kHz RTC crystal
• USB Type-C power and USB-to-UART download/debug through CH340N
• USB2.0 FS signals routed to the edge header
• GPIO, UART, I2C, SPI, GPADC, PWM, I2S, PDM, and wake-capable pins exposed
• QSPI LCD connector through a 16-pin, 0.5mm-pitch FPC
• I2C touch-panel signals
• Analog microphone and differential audio output pins
• One user LED
• Power key and function key
• Test points for measuring individual rail current

When to Use This Board¶

Choose SF32LB52-DevKit-Core-3p3 when you need the most direct access to SF32LB52x signals.

• Bring up custom daughterboards or sensor boards
• Evaluate SF32LB52x memory variants
• Prototype LCD, audio, USB, and GPIO functions
• Measure current on individual power rails
• Validate firmware before designing a compact product PCB

For a smaller castellated module-style board, use SF32LB52-DevKit-Nano. For a ready display board with audio amplifier, TF-card slot, and battery charger, use SF32LB52-DevKit-LCD.

Power¶

The board supports three power approaches:

• USB Type-C power, recommended for normal development and debugging
• 3.3V input through the edge header when USB is not connected
• External lab supply or current meter inserted into the relevant power path for current measurement

When USB Type-C is connected, the board can also provide 3.3V, 1.8V, and 5V outputs through selected header pins. Confirm the required direction before connecting external circuits.

The board includes a power switch. The CH340N RTS# signal can control board enable, allowing the host tool to reset the MCU during download or debug workflows.

Download and Debug¶

Use the USB Type-C UART port for firmware download and software debug.

• Download mode: enable BOOT in the download tool, then power or reset the board.
• Debug/log mode: disable BOOT, then power or reset the board.
• Reset: use the on-board reset/power-key function or the tool-controlled RTS reset path.

User Controls¶

Display Interface¶

The board supports QSPI LCD panels through a 16-pin, 0.5mm-pitch FPC connector. The connector supports LCD reset, backlight PWM, TE, chip select, clock, four data lines, and I2C touch signals.

16-Pin LCD FPC Signal Map¶

The original board note identifies the 1.85-inch AMOLED module as a directly supported display through the 16-pin FPC cable.

Header Signal Summary¶

The board exposes two 24-pin edge headers. The first side focuses on general GPIO, SPI2, USB, GPADC, and power. The second side focuses on LCD, touch, debug UART, audio, and power.

General I/O Header¶

LCD, Audio, and Debug Header¶

External Flash and SDIO Pins¶

Some variants include an external 16MB QSPI-NOR Flash. The shared storage/SDIO pin group is:

Check whether these pins are already occupied by the mounted Flash before using them for SDIO or other expansion functions.

Audio Expansion¶

The board routes analog microphone bias/input and differential DAC output, but the microphone and differential audio power amplifier are external. This makes the board flexible for testing different microphone, headphone, and speaker-amplifier circuits.

Related Documents¶