Datasheet

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 dened 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
10
=1024. This means that supported voltage
range, for example from 0-1.8V, can be divided into 1024 discrete steps of about 1.758mV. EasyMx PRO
™
v7 for STM32 provides an
interface in form of potentiometer for simulating analog input voltages that can be routed to any of the 5 supported analog input pins.
page 38
ADC inputs
J8
P1
10K
R42
220
J8
C28
100nF
PC0
PA3
PA6
PA4
PA5
VCC-1.8V
C42
100nF
VCC-1.8V
DATA BUS
Enabling ADC inputs
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.
Figure 24-1:
Schematic of ADC
input
EasyMx PRO
v7
other modules