PAN1783 / PAN1783A🔗
The PAN1783 (ENW89860A1KF) is a Bluetooth® Low Energy (LE) module based on the Nordic Semiconductor nRF5340 single-chip controller.
You can find long-lived documents on the official product websites:
The PAN1783A (ENW89860C1KF) is the identical module, but with a bottom-pad connector for an external antenna instead.