ST blueNRG-2 chip internal crystal usage in low power mode

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ST blueNRG-2 chip internal crystal usage in low power mode [Copy link]

 

【Problem Description】:

Our hardware design is based on the external 32khz crystal oscillator. The software configuration is also configured by default with an external 32khz crystal oscillator according to the programming manual.

However, after entering low power mode, no external 32khz crystal oscillator signal was detected using an oscilloscope. The sleep level is set to the highest standby mode SLEEPMODE_NOTIMER.

The question is: will the chip automatically switch to the internal 32khz clock when in SLEEPMODE_NOTIMER sleep mode? Please take a look.

【Hardware Design Drawing】

【Software Configuration and Programming Manual Screenshot】