#####   
 ##  ##  
 ##  ##  
 ##  ##  
 ##  ##  
         

 _____ 
|  __ \
| |  \/
| | __ 
| |_\ \
 \____/
       
       

 ______
|___  /
   / / 
  / /  
./ /___
\_____/
       
       

 _ 
(_)
| |
| |
| |
(_)
   
   

         
         
 #     # 
 #  #  # 
 #  #  # 
 #  #  # 
  ## ##  
         

IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now.


Visit Preferences to set your user name
Summary of change:
'''CAN bus voltage bias''', related to CanBus The noise tolerance, and sometimes even operation of the CAN bus depends on * termination (well known, typically 120 Ohm at/near each end of the differential pair). * voltage BIAS ---- '''Voltage BIAS''' Unlike the RS485 transceivers, the CAN transceiver only * pulls the CANL signal LOW (when actively transmitting) * pulls the CANH signal HIGH (when actively transmitting) '''TJA1050 has weak 25k bias toward 2.5V''' (VCC/2), but pullup/pulldown would '''seem desirable:''' * '''CANL: 10k pullup''' to +5V * '''CANH: 10k pulldown''' to GND It might work without these pullup/pulldown (it is easy to add externally, and the dash likely has it anyway), but it sounds safe and friendly to just include 10k (or at least a weaker 20k if very cautios).
Optional: Add document to category:
Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.