You are here

AN95089 - PSoC® 4/PRoC™ Bluetooth Low Energy Crystal Oscillator Selection and Tuning Techniques | Cypress Semiconductor

AN95089 - PSoC® 4/PRoC™ Bluetooth Low Energy Crystal Oscillator Selection and Tuning Techniques

최신 업데이트: 
2020년 12월 08일
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.


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.

Dear valued customer,

Thank you for choosing our products. They come with all the know-how and passion that our engineers have put into it. As you probably already know, Cypress is now Infineon. This is a major step for our company, but also for the good of you. 

Reliability and business continuity are of utmost importance for us. Hence, we remain fully committed to honoring existing customer and distributor relationships. This includes offering the legacy Cypress product portfolio. We thank you very much for your trusting support.

For the full version of this message, please download the PDF version.

번역 문서는 참고용으로만 제공하는 것입니다. 설계 과정에 참여할 경우에는 영어 버전 문서를 참고하는 것이 좋습니다.