FS23 HVLDO3

KidhRobin — Thu, 05 Feb 2026 13:14:12 GMT

Hello,

I am using FS23 to develop the software, and I have a question about FS23 HVLDO3 ,

here the datasheet mentioned :"This regulator is meant to supply the integrated CAN transceiver. The connection is made internally."

for my understand HVLDO3 also provide power to the internall CAN transceiver ,and if we disable HVLDO3 by SPI ,then CAN transceiver will not work , and if I want to use CAN transceiver then I shall always enable HVLDO3,

my understand is right?

Re: FS23 HVLDO3

ErikaC — Thu, 05 Feb 2026 19:01:57 GMT

Hello,

Your understanding is correct.
The FS23’s HVLDO3 regulator supplies power to the internal CAN transceiver, through an internal connection.
Therefore, If you disable HVLDO3 via SPI/I²C, the internal CAN transceiver will stop working, because it loses its power source.
If you want to use the internal CAN transceiver, HVLDO3 must always remain enabled.

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FS23 HVLDO3

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