SF32LB56x Hardware Design Guide — Design Review Checklist and References¶

7. Design Review Checklist¶

• U or V variant, package, pinout, and PCB process are confirmed.
• Processor rails, PMIC outputs, capacitors, reset, charger, and low-power switches are reviewed.
• Operating modes, wake sources, pull-up rails, and sleep leakage are reviewed.
• 48 MHz and 32.768 kHz crystal parameters, placement, and routing are reviewed.
• RF matching, antenna layout, and tune plan are complete.
• Display, storage, audio, sensor, PBR, UART/I2C, GPTIM, debug, and production pins have no conflicts.
• QFN or BGA fanout, stack-up, impedance, DRC, and ESD strategy are complete.
• Production flashing and crystal calibration flow have been tested.

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 6.3 of the PCB Layout Guidelines reproduce the same SF32LB56x 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 SF32LB56x Product¶

A typical SF32LB56x product includes the MCU, PMIC, display and touch controller, boot storage, optional external memory, sensors, vibration motor, audio input/output, Bluetooth antenna, crystals, debug access, and production test access. The U package favors compact QFN implementation, while the V package enables richer interfaces with BGA/HDI layout planning.

10. Revision History¶

10.1. Checklist Revision History¶

The item-by-item checklist in the Schematic Checklist and Section 6.3 of the PCB Layout Guidelines is versioned separately from the guide, following SiFli's own SF32LB56x Schematic & PCB Checklist workbook.