8 years, 7 months ago.

minimum input voltage

what is the minimum input voltage that the mbed nxp lpc1768 can reliably detect a signal at?

2 Answers

8 years, 7 months ago.

I'm talking about analog. i am getting a 0.05 volt signal for a duration of about 2 ms.

Accepted Answer

The ADC is 12-bit, so 4096 divisions, over 3.3V. That means the smallest values it should be able to detect is roughly 0.001V. Now that probably wont be too reliable, however your value is a factor 50 above that, you should be fine.

That said, do have a look at: http://mbed.org/users/chris/notebook/Getting-best-ADC-performance/

posted by Erik - 18 Mar 2013
8 years, 7 months ago.

I assume you minimum voltage required for a signal to be detected as high? That is specified as 0.7*Vdd = 2.3V.