Adc Inputs - Mikroe EasyMx PRO v7a Manual

VCC-1.8V VCC-1.8V
P1
C42
100nF
10K
ADC input schematic
E a s y M x P R O v 7 a U s e r M a n u a l

ADC INPUTS

Digital signals have two discrete states, which are decoded as high and low, and
interpreted as logic 1 and logic 0. Analog signals, on the other hand, are continuous, and
can have any value within defined range. A/D converters are specialized circuits which can
convert analog signals (voltages) into a digital representation, usually in form of an integer
number. The value of this number is linearly dependent on the input voltage value. Most
microcontrollers nowadays internally have A/D converters connected to one or more input
pins. Some of the most important parameters of A/D converters are conversion time and
resolution. Conversion time determines how fast can an analog voltage be represented in
form of a digital number.
This is an important parameter if you need fast data acquisition. The other parameter is
resolution. Resolution represents the number of discrete steps that supported voltage range
can be divided into. It determines the sensitivity of the A/D converter. Resolution is represented
in maximum number of bits that resulting number occupies. Most microcontrollers have
10-bit resolution, meaning that maximum value of conversion can be represented with 10
bits, which converted to integer is 2
example from 0-1.8V, can be divided into 1024 discrete steps of about 1.758mV. EasyMx
PRO v7a provides an interface in form of potentiometer for simulating analog input voltages
ADC INPUT module view
that can be routed to any of the 5 supported analog input pins..
PA3
PA4
R42
PA5
PA6
220
PC0
J8
C28
100nF
=1024. This means that supported voltage range, for
10
Enabling ADC inputs
DATA BUS
In order to connect the output of the
potentiometer P1 to PA3, PA4, PA5,
PA6 or PC0 analog microcontroller
inputs, you have to place the jumper
J8 in the desired position. By moving
the potentiometer knob, you can create
voltages in range from GND to VCC.