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Minimize startup current consumption for BLE application on nRF51832

Hello,

According to below thread, we could choice 16MHz external crystal with minimal “startup” current consumption:

https://devzone.nordicsemi.com/f/nordic-q-a/1657/how-to-minimize-current-consumption-for-ble-application-on-nrf51822

The thread seems closed, would you please provide more information about how to choice 16MHz external crystal?

I'm now facing a problem is that, I'm using a power supply 3.3V with limited current output (max 4mA), it is not able to power up 52832, except choice 16MHz external crystal, any other way that I can minimize the startup current?

Thanks and regards,

Kevin