Electronics > Projects, Designs, and Technical Stuff
Strange ADC behavior at lower voltages using an MSP430
<< < (3/3)
smoothVTer:
So it all turns out the NFET was turning on fully, but the PFET was not due to the lowered source-to-drain voltage when VBATT was low.  The PFET in the DMC3400 device had a max Vth of -2.6V !   So, my bad on that miss. 
 
Luckily, I found another pin-for-pin compatible NMOS/PMOS pair in the same SOT-363 package:  the DMG1016UDW  which has a max Vth of 1.0V nmos / -1.0V pmos.     So don't have to do another board rev, only a BOM revision. 

Thanks for chiming in everybody!  When I have time I will look into doing this a bit simpler using one of the suggestions above.
Navigation
Message Index
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod