Hello,
I have a question and feedback about "CAN bit timing calculator" Excel spreadsheet.
What does "Extra propagation delay (us)" parameter exactly mean?
| Extra propagation delay (us) | 0,1 |
Is it need to enter double delay for both transceivers or just for single one?
For example from datasheet on adm3053 IC we have "Propagation Delay from TxD Off to Receiver Inactive1" 250 ns max.
So am I need to enter 2*250ns = 0,5us to "Extra propagation delay (us)" cell?
If I do so:
| Input bus parameters here | ||||||||||
| Bit rate (kilobits/sec) | 1000 | |||||||||
| Bus length (m) | 10 | Assumed propagation speed is 5 ns/m | ||||||||
| Extra propagation delay (us) | 0,5 | From isolation or other sources of physical layer delay | ||||||||
| CAN clock frequency (MHz) | 75 | SYSCLK/2 for eCAN or the CAN bit clock frequency for D_CAN | ||||||||
Then I get error:
| Error: Propagation time is too long for desired bit rate! |
Although adm3053 promises "High speed data rates of up to 1 Mbps".
Thank you!
