Hello,
I am making a device with MCP2515 which will be just triggering oscilloscope (using SOF and RX1BF/RX0BF pins) so you can simply see a CAN message from another device with an oscilloscope which doesn't have CAN bus triggering. My problem is that I need a positive pulse to externally trigger oscilloscope which is ok with SOF pin (it just make a puls when the message Start Of Frame comes), but RX1BF and RX0BF pins are inverted... they are normaly HIGH and when the message buffer is full they go LOW so I need to invert this signal. Someone told me something about an easy circuit with MCP602 OpAmp (something like on the picture), but I don't really remember the circuit and how does it work.
I am making a device with MCP2515 which will be just triggering oscilloscope (using SOF and RX1BF/RX0BF pins) so you can simply see a CAN message from another device with an oscilloscope which doesn't have CAN bus triggering. My problem is that I need a positive pulse to externally trigger oscilloscope which is ok with SOF pin (it just make a puls when the message Start Of Frame comes), but RX1BF and RX0BF pins are inverted... they are normaly HIGH and when the message buffer is full they go LOW so I need to invert this signal. Someone told me something about an easy circuit with MCP602 OpAmp (something like on the picture), but I don't really remember the circuit and how does it work.