You are here

AN95089 - PSoC® 4/PRoC™ BLE Crystal Oscillator Selection and Tuning Techniques | サイプレス セミコンダクタ

AN95089 - PSoC® 4/PRoC™ BLE Crystal Oscillator Selection and Tuning Techniques

最終更新日: 
2020 年 6 月 24 日
バージョン: 
*E
AN95089 guides you in selecting the external crystal oscillator (ECO) and watch crystal oscillator (WCO) for PSoC / PRoC BLE devices to achieve good RF performance. The AN gives insights into crystal basics and clock accuracy measurements. Cypress-recommended crystals and tuning techniques for optimum performance are also discussed.

はじめに

This application note helps you select the ECO crystal and the WCO crystal for PSoC 4/PRoC BLE devices and tune them for optimum performance.

Bluetooth Low Energy (BLE) is a timing-sensitive technology in which an inaccurate ECO clock can degrade the physical layer RF performance; similarly, an inaccurate WCO clock can lead to increased power consumption in a peripheral.

The on-chip ECO circuit with an external crystal is used to synthesize a 24-MHz clock to run the BLE subsystem. The clock sets the protocol timing for link-layer operations and derives the carrier frequency for physical-layer RF circuits.

An external WCO crystal is used to derive the 32.768-kHz clock that maintains link-layer timing synchronization when the BLE subsystem is in a low-power mode.

翻訳版のドキュメントは参照用です。設計開発に携わっている場合には、英語版のドキュメントを参照されることをお勧めします。