Are I/O pins of the development boards 5 V tolerant ?

[markbresler]

I have looked through the user manuals for the K64F AND KL25Z  development boards, but don't see an answer to this. Are I/O pins of the boards 5 V tolerant, what voltage is a logic high, is it related to supply voltage ?

Thanks,

Mark

[Jorge_Gonzalez · Accepted solution]

Hello Mark:

The 5V tolerance question is not dependent on the board, but in the MCU device itself. You have to refer to the corresponding datasheets:

KL25: KL2x |Kinetis KL2x USB MCUs|Freescale -> Documentation -> KL25P80M48SF0

K64: K64_120 |Kinetis K64 120 MHz MCUs|Freescale -> Documentation -> K64P144M120SF5

- KL25 does not have 5V tolerant I/O pins:

- In K64 all the Digital pins (PTA, PTB, etc...) are 5V tolerant except for RESET, EXTAL and XTAL:

As you can see, both are 3.3 V devices (max 3.8 V). The min/max logical levels can be also found in the datasheet.

Regards!,
Jorge Gonzalez

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