Hi All (Gerald),
A bit confused about the differences between the BBW and BBB Sitara
balls B15 and B5 voltage levels. Reviewing the schematic for the BBW it
appears PORZ (B15) is being driven from the TPS65217B pin PGOOD (26) and
PGOOD's power supply source VIO is at 3.3v. While on the Sitara RTC_PORZ
(B5) is being driven at 1.8 v due to the resistor divider R141 and R18.
My understanding from reading the TRM on the Sitara is that both B15 and
B5 are 1.8v level pins.
Now on the BBB, both B15 and B5 on the Sitara are being driven directly
from the TPS65217C who's VIO is at 1.8v and this all makes sense.
Any help in clarifying my confusion would certainly help.
We're in the process of bringing up our new custom board based on the
BBB and have burned up a Sitara because we pushed 3.3v into the VIO pin
of the TPS65217C and therefore killed the Sitara via B15 and B5.
Thanks Gerald.
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