2x 3V3 needed?

[awickert]

We currently have

• 3V3 1
  ** RTC
  ** SD card
  ** I2C pull-ups
• 3V3 2
  ** Analog sensor power
  ** Any other external sensor, etc. power

Do we really need this? Note:

• Will be on at around the same time
• Sensors can use the external power, but (if I2C) be pulled up to 3V3 from the internal power.

Note also:

• This might not be a problem having 2 in the same chip (like what Chad has found) -- certainly within I2C tolerance even if both sides don't use the same 3V3 regulator (I'm guessing they tap into the same one)
• We already have a reel of these chips...

Tentative conclusion:

• Keep separate, do nothing; hold the status quo because no real gains or losses.