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How do I match the UART level between modules and the MCU?

2018-10-15 15:57:59

a) If the UART level of the MCU is 3.3V, the following circuit is recommended. If the level is 3.0V, change the resistance value from 5.6K to 14K.

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b) If the UART level of the MCU is 3V or 3.3V, the following circuit is recommended.

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Note: Make sure that the minimum client upper limit is less than 2.8V minus the diode voltage drop.
 
c) If the UART level of the MCU is 5V, the following circuit is recommended.

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