Pro Mini Atmega328P 3.3V 8MHz Microcontroller Board Products

Created: 10Sep2024 06:52:49 UTC 2024-09-10T06:52:49Z
Updated: 17Sep2024 05:03:14 UTC 2024-09-17T05:03:14Z

Description

The Pro Mini 3.3V 8MHz microcontroller board has the ATmega328P MCUMicrocontroller Unit used in the Arduino Uno R3, but in a small form factor to fit inside an enclosure. There is no USB connector and USB-to-Serial converter on the board to make it as small as possible and minimize the cost, so a USB Serial Adapter or another microcontroller board with UARTUniversal Asynchronous Receiver-Transmitter is required to program the board.

Processor

The Pro Mini has an 8-bit processor. The Pro Mini 3.3V board version runs at 8MHz, half the speed of the 5V board version and Arduino Uno R3. A slower resonator was put on the 3.3V board to guarantee safe operation of the ATmega328P (the maximum frequency for safe operation is dependent on the power supply VCC according to the ATmega328P specs).

Memory

32KB Flash
1KB EEPROMElectrically Erasable Programmable Read-Only Memory
2048 bytes SRAMStatic Random Access Memory

I/OInput/Output

14x Digital I/OInput/Output with 6x PWMPulse-Width Modulation (3.3V Logic)
8x 10-bit ADCAnalog-to-Digital Converter (ADC, A/D, or A-to-D) (0V to 3.3V range)
Communication Interfaces (3.3V Logic): UARTUniversal Asynchronous Receiver-Transmitter, I2CInter-Integrated Circuit. Also referred to as IIC or I²C., and SPISerial Peripheral Interface

User Interface

1x Reset Button
1x Power LED
1x Status LED

Power

There are three different power related pins: VCC, RAW, and GND.

RAW is the input voltage that runs into the regulator and can be anywhere from 3.3V to 16V (4V to 12V recommended) with a maximum current of 150mA at 3.3V.
VCC is supplied directly to the ATmega328P, so any voltage applied to that pin should already be regulated to 3.3V (6V max, 200mA max).
GND is the common/ground/0V reference.

Board Size