Just a thought, do your really need to use ADC ? couldn't a comparator do the same job, perhaps with less current. On Sat, Sep 15, 2012 at 11:08 AM, IB Peter Feucht wrot= e: > > Hello, > > in a new project I need to operate a PIC16F684 at a 9V battery. > I saw, that e.g. a MCP-1702 voltage regulator gives me a current consumpt= ion > of around 2=B5A while the PIC is in SLEEP mode, OK, some nA more for the = PIC > but this is more than OK for my application. > > My problem ist, that I need to check the battery voltage, because there a= re > some more externals which need at least 6V for proper operation. > > How is this done? Sure, using an ADC input of my 684 but for the battery > voltage is well above 5V I cannot simply connect my battery to the PIC po= rt, > but I need a voltage devider. > When looking at the data sheet I see a leakage current for an analog inpu= t > in the region of 500nA, so I assume, that I need a current through my > voltage divider which is about 10 or 20 times the leakage current, which = is > 5 to 10=B5A! > > But this much more than my 1702 needs! > > Does anybody have a tip how I can reduce the current through my voltage > divider? > > Thanks and have a great day. > > Peter > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 Jason White --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .