PCAN-AU5790 – User Manual
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Note: If the voltage source cannot supply a current up to
150 mA, an additional voltage supply must be used on Vaux at
the Single-wire CAN connection. This applies, for example, to
all CAN interfaces of the PCAN series with galvanic isolation
(“opto-decoupled”).
For the voltage supply of the bus converter a CAN interface of the
PCAN series must be configured so that the 5-Volts supply of the
computer is routed to either pin 1 or pin 9 of the High-speed CAN
connector. Please take detailed notes from the documentation of the
respective CAN interface.
When the 5-Volt supply is active, the red LED on the PCAN-AU5790
is on.
2.1.2 Voltage Supply Alternatively Via Pin 9
The bus converter is pre-configured to be supplied via pin 1 of the
connector. Alternatively the voltage supply Vmain can be done via
pin 9. For that a modification must be done on the PCB of the PCAN-
AU5790.
Important note: Perform the following procedure with special
care, because soldering can incur unintentional short circuits
on the PCB. This can lead to damage of the bus converter or the
connected hardware.
Do the following to route the voltage supply via pin 9:
1. Open the plastic casing of the PCAN-AU5790 by cautiously
levering the latches on both sides, e.g. with a flat tip
screwdriver.
2. On the bottom side of the PCB in the soldering field JP1, a 0-
Ohm resistor connects the lower two pads (see Figure 2).
Unsolder the resistor and replace it so that it connects the
