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ADM3054 bit rate problem

Question asked by GiovanniPangallo on Oct 29, 2013
Latest reply on Nov 6, 2013 by GiovanniPangallo

Hello,

 

I use two adm3054 to connect two microcontroller (pic18f2680) with the CAN bus. The actual bit rate is 35 Khz and communication between the two pic is correct.

 

 

20131029_174024.jpg

The yellow waveform is CANTX

The blue waveform is CANH

 

 

 

However if I try to increase the bit rate, the bus does not transmit the correct data. It become always occupied by the same trasmission that is repeat indefinitely as if the other device never ack.

 

20131029_173725.jpg

The yellow waveform is CANTX

The blue waveform is CANH

 


All the chips are on the same breadboard and the power supply is 5 volts. On the bus there are two 120ohm resistances between CANL and CANH.

 

Would you please kindly give me some suggestion?

Thank you.

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