The NRF52840 can operate from -40°C to 85°C, but the recommended operating temperature range is -20°C to 70°C for optimal performance.
The NRF52840 has an internal NFC antenna tuning circuit, but it requires external components to be added to the PCB design. Refer to the Nordic Semiconductor application note AN043 for guidance on NFC antenna tuning.
The maximum current consumption of the NRF52840 is approximately 60mA when transmitting at maximum power, but this can be reduced to around 10mA in low-power modes.
Yes, the NRF52840 can be used with an external crystal oscillator, but it is not required. The chip has an internal RC oscillator that can be used as a clock source.
Nordic Semiconductor provides a secure boot and firmware update mechanism through their nRF5 SDK. Refer to the SDK documentation and application notes for guidance on implementing secure boot and firmware updates.
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