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Pull-up/down resistors for UART

Question asked by Alexey Panteleychuk on Sep 6, 2016
Latest reply on Sep 6, 2016 by Martin Mienkina


Could you please advise if it's correct to connect MK10 to MKM33 without external pull-up or pull-down resistors?

Please find attached the block diagram.

Here we connect main MCU MK10DX256VLK7 to the metering MCU MKM33Z128ACLH5 and set UART0_TX pin for output, and PTI0 pin for input with internal pull-up/down.

When data goes from MKM33Z128ACLH5  to MK10DX256VLK7  we set PTI0 as output, and UART0_RX as input with internal pull-up/down.

Resistors R50 and R53 are used for nanosecond noise elimination. Vcc is is 3.3V.

Could you please advise if this implementation is correct or we need to add external pull-up/down resistors?


Thanks and regards,