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LINcab/LINpiggy with External Supply Voltage

Last updated: 2019-05-27
Question:
How to use LINcab/LINpiggy with external supply voltage?
Answer:
Since the recessive level on the bus depends on the supply voltage of the master, it is advisable to operate the LINcab/LINpiggy with an external supply voltage that is also used by the other bus nodes. This prevents cross currents between the individual nodes on the LIN bus. 

The following picture shows the pin assignment. 

Pin 3: VB- (Electrically decoupled ground)
Pin 4: Pdis (Power disable)
Pin 7: LIN
Pin 9: VB+

Connecting Pdis (pin 4) with VB– (pin 3) of the D-SUB of the network interface disables the internal voltage supply of the LINcab/LINpiggy. This makes it possible to perform measurements on the LIN bus, even with an external supply below 12 V.

More information you find in the document Accessories for Network Interfaces.

 
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2019-05-27
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