Comment
Author: Admin | 2025-04-28
The RN4677 since Microchip recently marked it for end of life and I think they're recommending the RN4678 for new designs. I haven't looked that closely at it for pin compatibility but I believe the major change is support for BLE 4.2.End of life for the RN4677 may not be a bad thing since it has some quirks and the documentation needs improvement.The documentation for the RN4677 says HW flow control can be enabled / disabled; it cannot and is always on. That's why BTCON has the RTS & CTS lines connected.It will not allow a connection if it doesn't see valid electrical states on the RX & TX pins when it boots. This shouldn't be a problem for BTCON since it derives its power from the unit it's plugged in to. But, be aware that if you power-up an RN4677 and the RX/TX lines are open you won't see BT advertisements or be able to connect to it (even if you have its address). I've found this to be true even when subsequently connecting the pins.The RN4677 will lock up if left running for >2 days without a connection. This happens even if there are periodic... Read more » btcon.zip Eagle schematic & PCB for BTCON. Zip Archive - 37.35 kB - 05/03/2018 at 19:30 Download usart.zip USART console service routines for Microchip 8-bit midrange MCUs. Zip Archive - 7.92 kB - 05/03/2018 at 19:30 Download 1 × RN4677-V/RM100 RF TXRX MOD BLUETOOTH CHIP ANT 2 × 10K RES
Add Comment