nRF5340 is a multiprotocol System on Chip (SoC) with two Arm®Cortex®-M33 processors that support Bluetooth® Low Energy, Bluetooth Mesh, LE Audio, and 802.15.4 protocols, such as Thread® and Zigbee®.
On the Nordic Thingy:91 X™, the nRF5340 SoC is primarily used to add USB connectivity to the Nordic Thingy:91 X™. The nRF5340 SoC is preprogrammed with the Connectivity bridge application. The nRF5340 SoC acts as a USB composite device exposing two UART interfaces of the nRF9151 System in Package (SiP) to a USB host as two CDC ACM devices used for logging and debugging. The Connectivity bridge application also implements a Bluetooth LE UART service which is disabled by default. The firmware of the nRF5340 SoC can be updated through USB to enable Bluetooth LE or 802.15.4 operation.
For more information, see Connectivity bridge.