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3v3 on uZed carrier card

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smvo555
Junior(0)
3v3 on uZed carrier card

Hi all,

I'm working on a custom carrier card for the Microzed and have been examining the differences between the power circuitry of the IO, FMC, and breakout carrier cards.

After careful review I can't see the harm in removing the 3v3 regulator from the design to save on board space. I will instead use the 5V line to enable the first regulator in the sequence.

I noticed the breakout carrier card does not have a 3v3 regulator but I'd rather use the MAX15066 based on the IO and FMC card designs because they can provide more output current.

Can anyone confirm my assertion about removing the 3v3 regulator? As far as the Zynq is concerned I only need to power the PL ports (no XADC)

Thanks,

Sam

ctammann
Moderator(1)
Hey Sam,

Hey Sam,

3.3V is used for the FMC connector, the PMOD connectors as well as the LEDs and some level translators. 3.3V does not provide power directly to the SOM so if your carrier board doesn't need it you can remove it. Just be very careful that you don't tie any signals to the FPGA to the 5V rail (such as LEDs without using a transistor).

Just be sure that whatever you power the PL with matches the I/O signaling voltage level of the components on your carrier.
Thanks
Chris

smvo555
Junior(0)
Thanks Chris,

Thanks Chris,

Actually, since the regulators are supplying VCCO I don't think my concerns about needing over 1A are valid. Anyone know why the beefier MAX15066 are used on the FMC and IO carrier card vs the LMR10510 on the breakout carrier card? What I don't like is the stack height of the inductor used in the MAX15066 circuit in the schematics.