In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

Hello Günther,

Thank You for the clarification on the way the clamping diodes are setup on the SX.  I assume this being the case that I could probably run the OEM Stamp chips (2SX and 2p40) on 3.3v as well.  I'll have to try that and see if it can save a bit of battery power....  I hadn't thought of running the OEM BASIC stamp chips on 3.3v until looking ar running the SX processor itself at 3.3v

I am just about wrapped up with my board for the SX48 OEM module.  I have one sticking point that I am on the fence about.  It is in regards to a module built using the 3.3v parts.  Pin 37 on the module which would normally be 5v out from the regulator on the module itself.  I have seen where some people have fed 5V directly into this pin if the circuit already had a 5v regulator in it and they want to use that for power.  That being the case I am somewhat inclined to isolate that pin and have a jumper (0 ohm resistor) to it or leave a trace that can be cut in this case.  Another possibility is just to leave it connected since if 5v were feed into the module the SX, EEPROM and MAX part should all still run at 5v anyhow.  If someone is feeding power in on pin 40 and doesn't expect to get power from the module on pin 37 then the point is moot.  Maybe i'll just leave it connected as is.  The only concern I guess is that if someone expects 5v out of pin 37 and the module has been built for 3.3v they'll have to account for that.

Anyone have any thoughts, ideas, or preferences?

Robert

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=166781#m168103

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)