Product overview
Description
The X-CUBE-CLKTRIM Expansion Package illustrates the trimming of an HSE crystal oscillator to reach the high-accuracy frequency required by RF applications. The STM32WB Series microcontrollers support low-power RF standards such as Bluetooth® Low Energy (±50 ppm minimum HSE clock accuracy) and IEEE 802.15.4 (±40 ppm minimum HSE clock accuracy).The STM32WL Series microcontrollers support sub-GHz RF standards such as LoRaWAN® and other low-power wide area networks (LPWAN). For these standards, the highest the HSE clock accuracy, the best the RF performance.
The frequencies of STM32 Wireless MCUs HSE oscillators can be tuned by means of values saved in dedicated registers. This features saves the extra cost of additional external capacitors and enables the compensation for frequency variations due to production, crystal, and PCB design.
The X-CUBE-CLKTRIM Expansion Package and associated application note (AN5042, AN5515) propose three different trimming procedures (manual, automatic, and with STM32CubeMonitor-RF (STM32CubeMonRF)) for the once-for-all storage of the right trimming parameters in OTP bytes. Each proposes two configurations: the trimming procedure itself and an implementation example of oscillator clock initialization in applications (loading of the trimming parameters in the according registers).
The HSE trimming manual procedure requires the user to use buttons to trim the RF clock frequency, which is output on a pin and can be monitored with a precision frequency meter. The HSE trimming automatic procedure consists in providing a precision clock reference to the STM32 so that it can trim its RF clock frequency (HSE) automatically. The HSE trimming procedure with STM32CubeMonitor-RF is similar to the manual one but uses STM32CubeMonitor-RF scripts instead of buttons.
For HSE trimming, it is not mandatory to trim each board in a production chain. A procedure is given for this purpose in the Precise HSE frequency trimming using STM32 wireless MCUs application note (AN5042).
X-CUBE-CLKTRIM firmware is built on the HAL drivers and runs on the Nucleo boards of the STM32 Wireless MCUs.
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All features
- STM32 Wireless MCUs high-speed external (HSE) crystal oscillator trimming allowing best RF performance for Bluetooth® Low Energy, IEEE 802.15.4, LoRaWAN® and LPWAN wireless applications
- Trimming parameters can be stored in user OTP Flash area
- Trimming in production procedure suggestion
Get Software
| Part Number | General Description | Software Version | Supplier | Download |
|---|---|---|---|---|
| X-CUBE-CLKTRIM | HSE trimming for RF applications using STM32 Wireless Series software expansion for STM32Cube | 3.0.0 | 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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All resources
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Product Specifications (1)
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Application Notes (1)
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| 26 Jan 2021 | 26 Jan 2021 |
User Manuals (3)
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Presentations (3)
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Brochures (2)
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License Agreement (1)
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| 08 Apr 2021 | 08 Apr 2021 |
