SF32LB55x Hardware Design Guide — Design Review Checklist and References¶

7. Design Review Checklist¶

• Exact package, pinout, land pattern, and PCB process are confirmed.
• All PMU and auxiliary power rails match the datasheet voltage/current limits.
• Required decoupling capacitors are placed close to pins.
• POR/BOR/reset timing and boot mode are verified.
• 48 MHz and 32.768 kHz crystals meet CL, ppm, ESR, placement, and routing requirements.
• RF matching, antenna, and ground keep-out are reviewed.
• External memory and display pin groups match the selected package.
• Wake, GPADC, sensor, audio, touch, backlight, and motor circuits meet low-power requirements.
• Debug, download, production flashing, RF test, and crystal calibration access are reserved.

8. Related Documents and References¶

Use the latest official documents when checking electrical limits, package data, pin multiplexing, software configuration, component qualification, and manufacturing constraints.

The Schematic Checklist (Section 5.8) and Section 6.4 of the PCB Layout Guidelines reproduce the same SF32LB55x Schematic & PCB Checklist (V1.0, 2026-01-21) item by item, alongside the schematic and PCB layout guidance they check against.

9. Appendices¶

Appendix A. A Typical SF32LB55x Product¶

A typical SF32LB55x product includes the MCU, power tree, crystals, RF matching and antenna, external memory, display and touch controller, sensors, GPADC inputs, vibration motor, optional Bluetooth audio, debug access, and production test access. Battery-powered designs should also include low-power leakage review and fixture-access planning.

10. Revision History¶

10.1. Checklist Revision History¶

The item-by-item checklist in the Schematic Checklist and Section 6.4 of the PCB Layout Guidelines is versioned separately from the guide, following SiFli's own SF32LB55x Schematic & PCB Checklist workbook.