The maximum operating temperature range for the NRF52840-QIAA-F-R is -40°C to 85°C.
The NFC tag functionality on the NRF52840-QIAA-F-R can be configured using the Nordic UART (NUART) interface. You need to use the NRF52840's NFC peripheral and configure it as a tag using the NFC library provided by Nordic Semiconductor.
Yes, the NRF52840-QIAA-F-R can be used as a BLE central device. It supports both BLE peripheral and central roles, and can be configured to act as a central device using the Nordic Semiconductor's SoftDevice.
The maximum transmit power of the NRF52840-QIAA-F-R is +8 dBm.
Secure boot on the NRF52840-QIAA-F-R can be implemented using the Nordic Semiconductor's Secure Bootloader. You need to generate a secure boot image using the Nordic nrfutil tool and flash it to the device.
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NRF52840-QIAA-F-R Overview
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