MIKROE-972 mikroElektronika, MIKROE-972 Datasheet - Page 38

• Manufacturer Part Number: MIKROE-972
• Description: Development Boards & Kits - ARM EASYMX PRO v7 ARM STELLARIS CORTEX-M3
• Manufacturer: mikroElektronika

Specifications of MIKROE-972

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: LM3S9B95
• Core: ARM Cortex M3
• Interface Type: CAN, I2C, SPI
• Operating Supply Voltage: 7 VAC to 23 VAC, 9 VDC to 32 VDC

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can be routed to any of the 5 supported analog input pins.
steps of about 3.222mV. EasyMx PRO
converted to integer is 2
Most microcontrollers have 10-bit resolution, meaning that maximum value of conversion can be represented with 10 bits, which
VCC-3.3V
ADC inputs
Digital signals have two discrete states, which are decoded as high and
represented in maximum number of bits that resulting number occupies.
low, and interpreted as logic 1 and logic 0. Analog signals, on the other
P1
10K
into. It determines the sensitivity of the A/D converter. Resolution is
hand, are continuous, and can have any value within defined range.
of discrete steps that supported voltage range can be divided
A/D converters are specialized circuits which can convert
parameter is resolution. Resolution represents the number
10
analog signals (voltages) into a digital representation,
=1024. This means that supported voltage range, for example from 0-3.3V, can be divided into 1024 discrete
parameter if you need fast data acquisition. The other
R56
220
usually in form of an integer number. The value
™
in form of a digital number. This is an important
v7 for Stellaris
of this number is linearly dependent on the
how fast can an analog voltage be represented
input voltage value. Most microcontrollers
resolution. Conversion time determines
J9
M2X5
nowadays
converters are conversion time and
most important parameters of A/D
converters connected to one or
more input pins. Some of the
®
provides an interface in form of potentiometer for simulating analog input voltages that
PE7
PE6
PE5
PE4
PD7
internally
have
DATA BUS
Figure 24-1:
Schematic of ADC
input
A/D
In order to connect the output of the
potentiometer P1 to PE7, PE6, PE5, PE4
or PD7 analog microcontroller inputs, you
have to place the jumper J9 in the desired
position. By moving the potentiometer
knob, you can create voltages in range
from GND to VCC.
Enabling ADC inputs
EasyMx PRO
v7