Dear ADI team,
I have a question about LTC2870.
I am seeing a waveform on the receiving RA at the timing to transmit serial communication,
Is this a specification or a malfunction?
I am attaching an image of an oscilloscope.
The top 8 waveforms show the UART and IC pin status of the transmitting and receiving UARTs, as well as the waveforms confirmed with a logic analyzer.
The bottom 4 are RS485 waveforms. RXEN.FEN and LB are all fixed to Low.
S1-UART-TX is the transmit DY waveform. This is converted to RS485 specifications by the IC, output from Y and Z as waveforms of C1 and C2, and received by the receiving IC
S2-UART-RX waveforms are sent to the receiver CPU as S2-UART-RX waveforms.
However, the waveform is output to RA at the timing of transmission (S1-UART-RX).
I would like to confirm if this is the specification.
Also, if I fix DXEN to be valid except when transmitting, this phenomenon will not occur.
This phenomenon does not occur.
Best regards,