AN5526 PCB design guidelines for the BlueNRG-LP device
● The device members of the BlueNRG family are very low power Bluetooth® Low Energy (BLE) devices compliant with Bluetooth specifications.
● The BlueNRG-LP is an ultra-low-power Bluetooth low energy (BLE) 2.4 GHz RF transceiver with a Cortex-M0+ microcontroller compliant with Bluetooth specification v5.2. The BlueNRG-LP is suitable to implement applications compliant with Bluetooth Low Energy SIG specifications.
● Bluetooth Low Energy technology operates in the same spectrum range (2400 - 2483.5 MHz, ISM band) as classical Bluetooth technology, but uses a different set of channels. Bluetooth Low Energy technology has 40 channels (37 data channels + 3 advertising channels) of 2 MHz band. Two modulation schemes are defined. The mandatory modulation scheme (1 Msym/s) uses a shaped, binary FM to minimize the transceiver complexity. The symbol rate is 1 Msym/s. An optional modulation scheme (2 Msym/s) is similar but uses a symbol rate of 2 Msym/s. The maximum transmit power is 10 mW (10 dBm).
● Further details are given in volume 6 part A of the Bluetooth Core specification v5.2.
● The BlueNRG-LP device is provided in three different packages:
■ QFN48
■ WLCSP49
■ QFN32
● ST provides all necessary source files (reference designs) for users that want to speed up their development.
● This application note aims to accompany the reference designs of the application boards and provide detailed information regarding the design decisions adopted within STMicroelectronics designs. In addition, it details the design guidelines to develop a generic radio frequency application using a BlueNRG-LP device.
● The RF performance and the critical maximum peak voltage, spurious and harmonic emission, receiver matching strongly depend on the PCB layout as well as the selection of the matching network components.
● For the optimal performance, STMicroelectronics recommends the use of the PCB layout design hints described in the following sections. Furthermore, STMicroelectronics strongly suggests to use the BOM defined in the reference design, BOM that guarantees, with a good PCB design, the correct RF performance.
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Application note & Design Guide |
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Please see the document for details |
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QFN48;WLCSP49;QFN32 |
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English Chinese Chinese and English Japanese |
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15-Sep-2020 |
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Rev 2 |
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AN5526 |
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1.8 MB |
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