Look at he rest of the PMIC. We had to move the regulators around due to the 1.5V rail requirement for DDR3. We lost a higher current LDO as a result. Also note the different versions of the PMIC used between the two boards.
Gerald On Fri, Oct 11, 2013 at 7:20 PM, Mike Farrell <[email protected]> wrote: > Thanks Gerald, > > Your reply is what I was suspecting. > > What is interesting the regular BB Rev A6A (not the BB Black) powers the > PHY from PMIC LDO4. I'm curious if they have had any issues? > > Mike > > > On Friday, October 11, 2013 6:48:36 PM UTC-5, Gerald wrote: > >> Not enough current. >> VDD_3V3AUX comes on at the wrong time in the sequence >> The 3V3B rail is for extra current. >> >> Gerald >> . >> >> >> >> >> On Fri, Oct 11, 2013 at 5:38 PM, Mike Farrell <[email protected]> wrote: >> >>> I did do a search first on this subject and did not come up with >>> anything. >>> >>> The BBB the LAN8710 PHY is powered by the VDD_3V3B rail. The VDD_3V3B >>> rail comes from a LDO sourced by SYS_5V and enabled by the PMCI VDD_3V3AUX. >>> My questions are: >>> >>> 1) Why not power the PHY directly off of the PMIC VDD_3V3AUX? >>> If OK use a analog switch like TPS27082 to EN power on PHY sequence? >>> >>> 2) Is the VDD_3V3B LDO for power-ON-sequence the PHY after the PMIC has >>> already gone through power sequence? >>> >>> tks >>> >>> Mike >>> >>> >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to beagleboard...@**googlegroups.com. >>> >>> For more options, visit >>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>> . >>> >> >> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
