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  • The X-CUBE-CLKTRIM expansion software illustrates the trimming of an HSE crystal oscillator in order to reach the high-accuracy frequency required by RF applications.

    The STM32WB Series microcontrollers support low-power RF standards such as Bluetooth Low Energy (BLE) and IEEE 802.15.4. BLE requires a minimum ±20 ppm-accurate RF clock while IEEE 802.15.4 accuracy requirement is ±40 ppm.
    STM32WB Series microcontrollers offer an efficient architecture with internal load capacitances that allow the fine tuning of the crystal frequency (32 MHz), saving the extra cost of additional external capacitances. Internal capacitance values are register controlled. They depend on various factors such as process variation, crystal, and PCB design and must therefore be set for each device individually.
    The X-CUBE-CLKTRIM software expansion for STM32CubeWB proposes a trimming procedure that allows the once-for-all storage of the right capacitance values in OTP bytes.
    X-CUBE-CLKTRIM is composed of a single project with two configurations. The first is the trimming procedure itself. The second is an implementation example of HSE clock initialization in RF applications.
    The firmware is built on the HAL drivers for the STM32WB Series.
    X-CUBE-CLKTRIM runs on Nucleo boards for the STM32WB Series.
    The trimming procedure consists in measuring the RF clock with a precision frequency meter (better than 0.1 ppm). The RF clock frequency value is controlled through the user push-buttons so that the best clock accuracy can be calibrated step by step.

    主要特性

    • High-speed external (HSE) crystal oscillator trimming
    • Allows best RF performance for BLE and IEEE 802.15.4
    • Trimming parameters stored in user OTP Flash area

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软件

    • 产品型号

      STM32Cube MCU Package for STM32WB series (HAL and LL low level drivers, USB, File system, RTOS - coming with examples running on ST boards: STM32 Nucleo, Discovery kits and Evaluation boards)

评估工具

    • 产品型号

      Bluetooth™ 5 and 802.15.4 Nucleo Pack including USB dongle and Nucleo-68 with STM32WB55 MCUs, supports Arduino™ Uno V3 and ST morpho connectivity

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技术文档

    • 描述 版本 文档大小 操作
      DB3399
      HSE trimming for RF applications using STM32WB Series software expansion for STM32Cube
      1.0
      119.69 KB
      PDF
      DB3399

      HSE trimming for RF applications using STM32WB Series software expansion for STM32Cube

    • 描述 版本 文档大小 操作
      UM2312
      Development checklist for STM32Cube Expansion Packages
      2.0
      306.99 KB
      PDF
      UM2285
      Development guidelines for STM32Cube Expansion Packages
      1.0
      485.46 KB
      PDF
      UM2312

      Development checklist for STM32Cube Expansion Packages

      UM2285

      Development guidelines for STM32Cube Expansion Packages

演示和培训资料

    • 描述 版本 文档大小 操作
      STM32 and STM8 embedded software solutions 7.0
      3.12 MB
      PDF

      STM32 and STM8 embedded software solutions

出版刊物和宣传资料

    • 描述 版本 文档大小 操作
      STM32 Open Development Environment Brochure 17.09
      1.21 MB
      PDF
      Sensor & motion algorithm software pack for STM32Cube 1.0
      544.58 KB
      PDF

      STM32 Open Development Environment Brochure

      Sensor & motion algorithm software pack for STM32Cube

法律

    • 描述 版本 文档大小 操作
      SLA0048
      Mix Ultimate Liberty+OSS+3rd-party V1 - SOFTWARE LICENSE AGREEMENT
      5.7
      87.58 KB
      PDF
      SLA0048

      Mix Ultimate Liberty+OSS+3rd-party V1 - SOFTWARE LICENSE AGREEMENT