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I need to know what is the minimum voltage that a micro-controller can detect

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alfie.max15

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In the project that i am working on i need to detect a signal coming from the mic which is a very weak and in the range of 1mV.

So i need to know can my micro-controller detect that as a high on any port pin...

Or what is the minimum voltage that is required so that the uC can detect and trigger a high in any pin to which it is connected...

Please reply fast if anyone can help...
 

In the project that i am working on i need to detect a signal coming from the mic which is a very weak and in the range of 1mV.

So i need to know can my micro-controller detect that as a high on any port pin...

Or what is the minimum voltage that is required so that the uC can detect and trigger a high in any pin to which it is connected...

Please reply fast if anyone can help...

Refer the datasheet of the controller which you are using............
 

hello,

see microchip with 12bits ADC
so you will get 1mV of resolution
to get deeper resolution use external Adc 16 or 18... bits
 

one doubt...

from the datasheet i got this information

For a supply 2.4v - 5.5v the VIL threshold is < 0.3 * Vcc , VIH > 0.6 *Vcc .

As av example for 5 supply the low threshold is 0.3 * 5v = 1.5v and the High threshold is 0.6 * 5v =3v

what does that mean???
 

A number of microprocessors is equipped with an analog comparator module that can detect mV voltages. Also ADC inputs could be used. But you won't achieve 1 mV accuracy due to offset voltages and limited ADC resolution. An external preamplifier or comparator seems to be a more suitable solution.
 

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