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The X-CUBE-CLKTRIM Expansion Package 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 and IEEE 802.15.4. Bluetooth® Low Energy requires a minimum ±20 ppm RF clock accuracy while IEEE 802.15.4 accuracy requirement is ±40 ppm.
The STM32WL Series microcontrollers support sub-GHz RF standards such as LoRaWAN® and meet the requirements of a wide range of wireless applications for low-power wide area networks (LPWAN). For LoRaWAN® as well as for other LPWAN applications, the highest the RF clock accuracy, the best the RF performance.
STM32WB Series and STM32WL Series offer an efficient architecture with internal load capacitors that allow the fine tuning of the crystal frequency (32 MHz), saving the extra cost of additional external capacitors. 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 Expansion Package proposes three different trimming procedures (manual, automatic, and with STM32CubeMonitor-RF (STM32CubeMonRF)) that allow the once-for-all storage of the right capacitance values in OTP bytes. Each proposes two configurations: the trimming procedure itself and an implementation example of HSE clock initialization in RF applications.
The manual 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.
The automatic trimming procedure consists in providing a precision clock reference to the STM32 so that it can trim its RF clock frequency itself, without any user intervention needed.
The STM32CubeMonitor-RF 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 by means of STM32CubeMonitor-RF configurable scripts for calibrating the best clock accuracy step by step.
X-CUBE-CLKTRIM firmware is built on the HAL drivers and runs on the Nucleo boards of the STM32 Wireless MCUs (STM32WB Series only).Key Features
- High-speed external (HSE) crystal oscillator trimming
- Allows best RF performance for Bluetooth® Low Energy, IEEE 802.15.4, LoRaWAN® and LPWAN wireless applications
- Trimming parameters stored in user OTP Flash area
Get Software
| Part Number | General Description | Software Version | Supplier | GitHub link | Download |
|---|---|---|---|---|---|
| X-CUBE-CLKTRIM | HSE trimming for RF applications using STM32WB Series software expansion for STM32Cube | 2.0.0 | ST | - | x License AgreementACCEPTPlease indicate your acceptance or NON-acceptance by selecting “I ACCEPT” or “I DO NOT ACCEPT” as indicated below in the media. BY INSTALLING COPYING, DOWNLOADING, ACCESSING OR OTHERWISE USING THIS SOFTWARE PACKAGE OR ANY PART THEREOF (AND THE RELATED DOCUMENTATION) FROM STMICROELECTRONICS INTERNATIONAL N.V, SWISS BRANCH AND/OR ITS AFFILIATED COMPANIES (STMICROELECTRONICS), THE RECIPIENT, ON BEHALF OF HIMSELF OR HERSELF, OR ON BEHALF OF ANY ENTITY BY WHICH SUCH RECIPIENT IS EMPLOYED AND/OR ENGAGED AGREES TO BE BOUND BY THIS SOFTWARE PACKAGE LICENSE AGREEMENT. Under STMicroelectronics’ intellectual property rights and subject to applicable licensing terms for any third-party software incorporated in this software package and applicable Open Source Terms (as defined here below), the redistribution, reproduction and use in source and binary forms of the software package or any part thereof, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE PACKAGE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. EXCEPT AS EXPRESSLY PERMITTED HEREUNDER AND SUBJECT TO THE APPLICABLE LICENSING TERMS FOR ANY THIRD-PARTY SOFTWARE INCORPORATED IN THE SOFTWARE PACKAGE AND OPEN SOURCE TERMS AS APPLICABLE, NO LICENSE OR OTHER RIGHTS, WHETHER EXPRESS OR IMPLIED, ARE GRANTED UNDER ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF STMICROELECTRONICS OR ANY THIRD PARTY. |
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