Hey.......... How about this issue? Has anybody come across this? Havent heard anything on this.
Thanks & Regards, Amit Pendharkar On 10/19/07, Amit Pendharkar <[EMAIL PROTECTED]> wrote: > > Hi Guys, > > I use motiev telosb board and am using adc to sample external signal on > adc0. > > I am configuring the adc so that it uses Vref=2.5V using parameters > REFERENCE_VREFplus_AVss & REFVOLT_LEVEL_2_5. > > But what I observe is that ADC mis-samples values above 1.25V and the > sampled values touch 0xFFF when i/p is 1.25V. Isnt it supposed to sample > till i/p is 2.5V??? > > For i/p > 1.25V, sampled values are always 0xFFF !!!! Why so? > > Clearly I cannot sample negative values since ADC is supposed to sample > only positive inputs, then why Vref=2.5 doesnt allow me to sample upto > 2.5V? > > Similarly ADC gives FFF for i/p = 0.75V and when configured with > REFERENCE_VREFplus_AVss & REFVOLT_LEVEL_1_5 > > On telosb board AVss, VeREF+ & Vref-/VeREF- pins are all connected to > ground, aren't they? > > Can somebody please throw light on this > > Thanks & Regards, > Amit Pendharkar >
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