基本介绍

The main purpose of this article is to help developers complete the development of watch solutions based on the SF32LB52X series chip。This article focuses on the precautions related to hardware design during the development process, aiming to minimize the workload of developers and shorten the time-to-market cycle of products。

SF32LB52X is a series of highly integrated, high-performance MCU chips for ultra-low power Artificial Intelligence of Things (AIoT) scenarios。The chip adopts a big.LITTLE architecture based on the Arm Cortex-M33 STAR-MC1 processor, integrating a high-performance 2D/2.5D graphics engine, an artificial intelligence neural network accelerator, dual-mode Bluetooth 5.3, and an audio CODEC，It can be widely used in various application scenarios such as wristband wearable electronic devices, smart mobile terminals, and smart home。

Attention

SF32LB52X是SF32LB52系列的常规供电版本，供电电压为2.97~3.63V，不支持充电，具体包含如下型号：
SF32LB52BU36，合封1MB QSPI-NOR Flash
SF32LB52EUB6，合封4MB OPI-PSRAM
SF32LB52GUC6，合封8MB OPI-PSRAM
SF32LB52JUD6，合封16MB OPI-PSRAM

The peripheral resources of the processor are as follows：

  • 45x GPIO

  • 3x UART

  • 4x I2C

  • 2x GPTIM

  • 2x SPI

  • 1x I2S音频接口

  • 1x SDIO 存储接口

  • 1x PDM音频接口

  • 1x 差分模拟音频输出

  • 1x 单端模拟音频输入

  • 支持单/双/四数据线SPI显示接口，支持串行JDI模式显示接口

  • 支持带GRAM和不带GRAM的两种显示屏

  • 支持UART下载和软件调试

封装

Package Information Table

封装名称

尺寸

管脚间距

QFN68L

7x7x0.85 mm

0.35 mm
hardware/SF32LB52/assets/52xB/sf32lb52X-B-package-layout.png
SF32LB52X QFN68L 管脚分布

Typical Application Solutions

The figure below shows the block diagram of a typical SF32LB52A/52D sports watch, with main functions including display, storage, sensors, vibration motor, and audio input and output。

hardware/SF32LB52/assets/52xB/sf32lb52X-B-watch-app-diagram-52X.png
SF32LB52B/52E运动手表组成框图

Note

  • Big.LITTLE dual-CPU architecture, balancing both high performance and low power consumption design requirements

  • Integrated charging management and PMU module on chip

  • Supports TFT or AMOLED display with QSPI interface, with a maximum resolution of 512*512

  • Supports PWM backlight control

  • Supports external QSPI Nor/Nand Flash and SD Nand Flash memory chips

  • Supports dual-mode Bluetooth 5.3

  • Supports analog audio input

  • Supports analog audio output

  • Supports PWM vibration motor control

  • Supports acceleration/geomagnetic/gyroscope sensors with SPI/I2C interface

  • Supports heart rate/oxygen saturation/ECG/geomagnetic sensors with SPI/I2C interface

  • Supports UART debugging print interface and burning tool

  • Supports Bluetooth HCI debugging interface

  • Supports one-to-many program burning in production lines

  • Supports crystal calibration function in production lines

  • Supports OTA online upgrade function