My MCU is 5V VCC, another device is 3V, both communicate using UART. From the device (3V) to MCU, I can direct connect, no problem.
From the MCU (5V) to the device (3V) via UART, I cant direct connect coz the device is not 5V tolerant.
The UART speed is 9600 bps.
So, what is the simplest and reliable way to drop 5V to 3V?
Can I use 2 diodes in series (5-1.4= 3.7V)?
Or use voltage divider?
Or use a 3V voltage regulator?
Which is the best approach in term of reliability?