• Not Answered

MAX3232-EP: Wrong oscillations on RS232

Part Number: MAX3232-EP


It was noticed that “V+” was at a correct voltage level when idle, but starts oscillating when a message is
transmitted from the module. see following:

The same measurement was done on “V-“, which has a faulty and noisy voltage level when idle, and also
oscillation when a message is being transmitted as noticed on the following capture, furthermore the voltage
is incorrect, around -4.75V instead of -5.5V. Significant noise can also be noticed at all times, which is not
present on a unit with a functional RS-232 transceiver.

If we replace the part the problem disappears.

Has TI some experiences or similar cases already reported for such part, that can indicate some technical issues of the component or wrong usage?

Thank you.


5 Replies