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STM32H573 & RS232

madhu1
Associate II

Hello Everyone, I am using STM32H573. Do we need to connect RS232 to UART transceiver or can we directly interface Rs232 signals with UART?

1 ACCEPTED SOLUTION

Accepted Solutions
SofLit
ST Employee

Hello @madhu1 ,

Indeed you need a transceiver. Example: ST3232

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

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4 REPLIES 4
AScha.3
Principal III

Hi,

CPU is at 0/+3,3V signal level, real RS232 maybe +/- 9 V signal ;

you need some interface, UART transceiver or similar. (without you damage the cpu ! )

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SofLit
ST Employee

Hello @madhu1 ,

Indeed you need a transceiver. Example: ST3232

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

Can I use a voltage level shifter and then connect to UART pins of micro?

If you mean by "a voltage level shifter" to replace the transceiver, the answer is no.

This is the ranges for RS232 with negative voltage:

RS-232-Voltage-Levels.png

So please use a suitable transceiver.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.