Running Bluetooth Low Energy on CC2640 Without 32 kHz Crystal

This application report from Texas Instruments explores how to configure SimpleLink™ Bluetooth® low energy (BLE) wireless MCUs, specifically the CC2640, CC2640R2F, and CC2650, to operate without an external 32 kHz crystal. It details the use of the internal RC low frequency oscillator (RCOSC_LF) as an alternative, examining its impact on current consumption and design considerations for peripheral and broadcast (beacon) roles.

By removing the 32 kHz crystal, designers can achieve a lower Bill of Materials (BOM) cost, reduce board space, and simplify procurement. The report covers the necessary hardware and software configurations, performance implications, and provides recommendations for optimal implementation.

Key topics include:

Configuration for BLE operation without a 32 kHz crystal.
Utilizing the internal RCOSC_LF and its calibration requirements.
Impact on current consumption for different device roles.
Recommendations for using this feature in specific BLE applications.

For detailed specifications on Bluetooth low energy clock accuracy, refer to the Bluetooth Core Specification. The necessary BLE-Stack SDKs can be downloaded from Texas Instruments.

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Running Bluetooth® low energy on CC2640 Without 32 kHz Crystal

An Application Report by Texas Instruments

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