PAN1780 / PAN1770🔗
The PAN1780 (ENW89854A1KF) is a Bluetooth® Low Energy (LE) module based on the Nordic Semiconductor nRF52840 single-chip controller.
You can find long-lived documents on the official product websites:
The PAN1770 (ENW89854C1KF) is the identical module, but with an U.FL connector for an external antenna instead.