A-Star 328PB Micro - 5V, 20MHz

Description: The A-Star 328PB Micro is a tiny programmable module featuring the ATmega328PB AVR microcontroller, a backward-compatible replacement for the popular ATmega328P that features more general-purpose I/O and many additional peripherals. This module provides access to all 24 digital input/output pins (of which 9 can be used as PWM outputs and 8 as analog inputs), all on a board measuring only 1.3″ × 0.7″. It ships preloaded with an Arduino-compatible serial bootloader that enables programming through the Arduino IDE via a USB-to-serial adapter, and the ISP pins are accessible for programming with an AVR programmer. This version features a 20 MHz resonator and a 5 V regulator that can be powered from 5.5 V to 15 V supplies. Note: See product description for speed warning.

Features:

• Dimensions: 1.3″ × 0.7″
• Programmable ATmega328PB AVR microcontroller
  • 32 KB flash (0.5 KB used by bootloader, leaving 31.5 KB available for user program by default)
  • 2 KB SRAM
  • 1 KB EEPROM
• All I/O lines from the ATmega328PB broken out in a compact package
  • 19 general-purpose I/O pins available along the sides of the board
  • 5 additional I/O pins available on bottom edge
  • 9 pins can be configured as hardware PWM outputs (7 along sides of board)
  • 8 pins can be configured as analog inputs
• Preloaded with Arduino-compatible TTL serial bootloader
• 6-pin TTL serial programming header for use with a USB-to-serial adapter (we recommend our USB AVR Programmer v2.1, which can act as a USB-to-serial adapter)
• 6-pin ISP header for use with an external AVR programmer (we recommend our USB AVR Programmer v2.1)
• Power LED and user-controllable LED
• Reset button
• Two power options:
  • 3.8 V to 15 V (3.3 V versions) or 5.5 V to 15 V (5 V versions) on BAT+
  • USB-to-serial adapter can supply power to VCCIN on the serial header
• Reverse-voltage protection on BAT+ supply
• Comprehensive user’s guide

Speed warning for 20 MHz version: The 20 MHz resonator frequency exceeds the maximum explicitly allowed in the ATmega328PB datasheet. In our basic testing, the 20 MHz resonator appears to function without problems, but for any critical applications you should confirm for yourself that this product is appropriate.