Content originally posted in LPCWare by samc on Sat Jul 10 15:09:53 MST 2010
Hi,
Id like to do Li-charging with the LPC1764 (surely it iwll do other things mainly :D)
So I need a precise reference for the ADC; my 3.3V is not very accurate, is form a DCDC.
It would be cheapest to connect a TL431 (2.500V) to the VREFP pin, but I am not too sure it this is allowed or not. The manual mentions it _should_ be equal to VDDA...
Does anybody know more about this issue?
Thanks,
Simon