Programming a 3V3-powered PICAXE with an AXE027

fernando_g

Senior Member
I am planning to build a Picaxe system which will be powered from a 3V3 supply.
But like all my projects, I would like to maintain software upgrade capabilities.

However, the AXE027 is a 5V-only device.

I was planning to include a resistive divider for Serial In pin, and a Mosfet level translator for the Serial Out pin.

Would this be the simplest method?
 

fernando_g

Senior Member
Ok thanks, I understand the part about 22k/10k portion for Serial In.

But will the lower Serial Out levels be enough to properly drive the AXE027?
 

AllyCat

Senior Member
Hi,

Yes, it will very probably work fine. I've programmed PICaxe chips at down to around Vdd = 2 volts, using a USB to "RS232" (9-pin D) adapter, which one might expect to be less tolerant of a low voltage return signal.

But if you do need an "improved" programming interface, see particularly paras 4 and 3 of post#1 in this thread.

Cheers, Alan.
 

MartinM57

Moderator
I've programmed literally 100's of (different) 08M2 PICAXEs with 3V3 power with an AXE027, with the standard download circuit, nothing on the serial out. No issues at all.
 
Top