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ADM3052 with Microchip MCU problem

Question asked by JerryS on Aug 15, 2013
Latest reply on Nov 19, 2013 by RAnslow

Hello,

 

Customer used the ADM3052 and Microchip MCU PIC18F66K80 for CAN-BUS isolated function.

During loading CAN-BUS function code, customer can't be normal output CAN-BUS signal with ADM3052 and CANH/CANL output seems to strange triangle waveform.

When RD doesn't load MCU CAN-BUS function code, he use GPIO simulate some waveform with same pins.

The CANH/CANL output is normal signal that seems to fine.


By the way, Customer try to use same MCU and CAN-BUS pins with MCP2551 CAN-BUS transceiver, and test result is fine.

(Pin 15, CAN_TXD and Pin 16 CAN_RXD of MCU for CAN bus signal in/output. as picture)

 

The Vsense pin of ADM3052 is workable when CAN+(+12V) connected or un-connected.

I had checked customer schematic and it is ok.

 

MCU CAN-BUS function code is support CAN 2.0b version. May it cause this problem?

Would you please kindly give me some suggestion? Thank you.

ADM3052 sch.jpg

MCU.jpg

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