Optimized RF board layout for STM32WL Series - Application note
■The STM32WL Series microcontrollers integrate RF transceiver for LPWAN (long-power wide-area network), compatible with LoRa®, GFSK, DBPSK, and MSK, in the frequency range 150 to 960 MHz.
■The STM32WL Series devices (named STM32WL later in this document) have two output powers:
◆ HP (high-power RFO_HP), optimized up to 22 dBm
◆ LP (low-power RFO_LP), optimized up to 15 dBm
■The devices also include a differential RF input (RFI, up to 0 dBm) for the Rx low-noise amplifier (LNA).
■To achieve the right performances for the RF output and RF input signals, some recommendations must be followed for the board design. Special care is required for the layout of an RF board compared to a conventional circuit.
■This document describes precautions to be taken to achieve the best RF performance of the STM32WL on efficient applications,that last for long time under battery. The description is based on the UFBGA73 (5 x 5 mm) reference 4-layer board.
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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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10-Jul-2020 |
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Rev 2 |
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AN5407 |
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3.1 MB |
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