Hi Ti Team,
With regard the output of CAN H/L for SN65HVD234DR, would you please consult TI and check if any requirement of ripple on the waveform as below picture. Thanks.
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Hi Ti Team,
With regard the output of CAN H/L for SN65HVD234DR, would you please consult TI and check if any requirement of ripple on the waveform as below picture. Thanks.
This is common-mode noise, so it will have no effect on the differential voltage. Tell the oscilloscope to subtract the two inputs.
I suspect that this ringing is caused by the load on the power supply. Ensure that the decoupling capacitors are near the device and large enough.
Thanks Clemens!
Hi Switch,
This ripple is expected for this device. The common-mode recessive bias for this device (2.3V) is different than the dominant drive state common-mode voltage (Vcc / 2 ~= 1.85V). Because the common-mode of the bus needs to shift between these drive states, it's expected to see this shift appear. When this is applied to an actual CAN bus, the parasitic inductance and capacitance causes the energy introduced by this common-mode shift to oscillate and ring. As Clemens said, because all of this noise is in the common-mode, it does not impact the differential signal and therefore does not reduce the integrity of the CAN data.
Let us know if you have any more questions.
Regards,
Eric Schott