Hello!
I am new to the forum! So nice to meet you! I would like to make a quick question about a PCB I am designing.
Specifically I design a PCB of a 3-phase inverter for the drive of a PMSM. I intend to connect this PCB with the STM32-H407 board, in order to control the inverter.
However I have a little trouble regarding a power supply issue. Specifically I want to use a Quad Differential Line Receiver for the QEI signals that come from the motor and before sending them to the μC.
On my PCB I already have a 5V Power supply but in order to be able to send these signals to STM32F407, I need to use a 3.3V supply source, otherwise the digital output signals of the IC would be 5V.
Do you think I could use the supply from the development board? The supply current gets maximum value of 3.5mA according to the receivers output, which I consider to be not that large, compared to the total 0.5Amp the the board's supply can give.
I don't know if active links are allowed, therefore I didn't put any. However the name of the Receiver is MAX3096.
Thank you in advance for your help.
Regards,
Pantelis
The board has power to spare. The step-down converter insures you have enough current at 3,3V