Hello, the TI app note for the AM3358 recommends this clamping circuit between the VDDSHVx and VDDS power rails:
However, since the VDDS rail comes up first, this will result in it back-feeding the VDDSHV on power up through the TLV, which we have simulated.
Is this back-feeding acceptable?
Hello Kallikuppa,
I'm referring to this app note: https://www.ti.com/lit/ug/slvu731b/slvu731b.pdf?ts=1677085612608
It recommends the previous circuit I attached be used to ensure the VDDS rail and VDDSHV rail do not have a voltage difference > 2V.
In the AM335X Sitar Datasheet (Rev L) there is this power up sequence recommendation, where VDDS_RTC powers on.
If I follow the recommended circuit design, the VDDS will be back-feeding the VDDSHV rail which is configured to 3.3V and would come up later. Is this an issue?
