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This application report explains how you can configure the SimpleLink™ Bluetooth low energy CC2640 wireless MCU and multi-standard CC2650 wireless MCU to run the Bluetooth low energy (BLE) software stack without the need for a 32 kHz crystal. This application report explains how to configure this mode of operation, what considerations have to be taken to use the internal RC low frequency oscillator (RCOSC_LF) for the Bluetooth low energy peripheral and broadcast (beacon) role devices instead of the 32 kHz crystal, and what impact it has on current consumption. This document assumes the reader is familiar with the concepts described in CC2640 and CC2650 SimpleLink™ Bluetooth® low energy Software Stack Developer's Guide and the CC13xx, CC26xx SimpleLink™ Wireless MCU Technical Reference Manual. Removing the 32 kHz crystal from a design lowers the bill of material (BOM) cost, reduces the required board space and simplifies procurement.
