STM32WB/STM32WL Series Precise HSE frequency trimming using STM32 wireless MCUs
■This application note describes the HSE trimming for RF applications using any device of the STM32WB and STM32WL Series (hereinafter referred to as STM32 wireless MCUs). These microcontrollers offer a cost-effective and efficient solution by using their internal load capacitances to control the oscillator accuracy, hence saving the cost of external capacitances and lowering the crystal constraints.
■STM32 wireless MCUs use an external oscillator high-speed clock source as the base for RF clock generation. HSE accuracy is essential for RF system performance and the external oscillator is therefore fine-tuned to achieve the highest clock accuracy.
■The first part of this application note introduces the crystal oscillator solutions. The second part introduces and then compares three HSE tuning methods, namely a manual one, an automatic one and another one based on STM32CubeMonitor-RF. The application of these methods to STM32WB Nucleo boards is described in the following sections and provided as firmware examples in X-CUBE-CLKTRIM, an STM32Cube Expansion Software.
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STM32WB 、 STM32WL Series 、 STM32WL 、 STM32Cube 、 X-CUBE-CLKTRIM 、 STM32 |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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04-Feb-2020 |
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Rev 5 |
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AN5042 |
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1.1 MB |
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