Controlling CAN terminator with Propeller pin.

Comments

• AwesomeCronk Posts: 1,055

  2019-06-03 13:49

  So, what exactly are you controlling?
• sccoupe Posts: 118

  2019-06-03 13:52

  Terminating resistor enabled or disabled.
• Phil Pilgrim (PhiPi) Posts: 23,514

  2019-06-03 14:30

  Use a FET-output optocoupler, such as the TLP3545A, with pins 4 and 6 (in this case) in series with the resistor.
  
  -Phil
• Mark_T Posts: 1,981

  2019-06-03 20:35

  Or an LDR output opto coupler (though some experimentation needed for the right resistance value) for instance NSL-32SR2
• jmg Posts: 15,144

  2019-06-04 03:42

  sccoupe wrote: »

  I'd like to be able to switch the terminator resistor on and off with a propeller CAN node programmatically instead of using using a physical jumper. I thought of using a tri-state buffer, but the bus voltage goes over the usual 5v allowed. Most of the transistor examples are switching voltage a don't seem valid for the changing voltages of a CAN bus. A physical relay also isn't preferred. There is a way, I just have found the right search terms...

  
  As above, if you want the full transient tolerance of CAN, some isolation is needed.
  Phil quotes a 4A SSR, but you might be ok with smaller/cheaper ones. egg CPC1006N, VO1400AEFTR , CPC1002N, TLP241A(TP1,F etc
• Peter Jakacki Posts: 10,193

  2019-06-04 03:52 edited 2019-06-04 03:54

  I've used G3VM-61G1 optos for electronic termination selection. They are 1ohm 400ma devices but listed as EOL which is not a problem but the replacement is G3VM-61VY