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Forum Index : Microcontroller and PC projects : (Mini-M) Power Supply

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MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139

Posted: 12:17am 13 Jan 2012

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If I supply the +5V to the minimite on the header pin, does it convert it down to 3.3V for the pic32 or do I need to supply 3.3V as well?

Cheers

Keep plugging away, it is fun learning
But can be expensive (if you keep blowing things up).

Maximite, ColourMaximite, MM+

djuqa

Guru

Joined: 23/11/2011
Location: Australia
Posts: 447

Posted: 01:05am 13 Jan 2012

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IC2 LM1117 is the 3.3v Regulator that creates the 3.3v feed to PIC32 from the 5v Rail
on original Maximite
On the Mini you have to supply 3.3v from external source
(use a small circuit based on the section around the IC2 from original circuit)
[quote=from description on geoffg.net.] CON2 pin 1 is the ground.
CON2 pin 2 is the power supply. The mini Maximite needs between 2.3 and 2.6V to operate and it draws about 125mA unloaded. When writing to the internal flash memory (drive A: in MMBasic) it needs a minimum of 2.9V.
CON1 pin 2 is the 5V supply from the USB if it is connected to a host computer. If you want to use this to power the mini Maximite you will have to provide an external low dropout 3.3V regulator and feed its output to CON2 pin 2.
[/quote]Edited by djuqa 2012-01-14

VK4MU MicroController Units

MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139

Posted: 03:23am 13 Jan 2012

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Thanks.

Keep plugging away, it is fun learning
But can be expensive (if you keep blowing things up).

Maximite, ColourMaximite, MM+

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