A-Star 32U4 Mini SV

DESCRIPTION

The A-Star 32U4 Mini SV is a programmable module based on the ATmega32U4 from Microchip (formerly Atmel). Unlike competing products, it has an onboard switching step-down regulator that allows it to be powered efficiently from a 5 V to 40 V supply. This compact 1.9″ × 0.7″ board breaks out all 26 of the microcontroller’s I/O pins (of which 7 can be used as PWM outputs and 12 as analogue inputs), and loading programs is made easier by a Micro-USB interface and a preloaded Arduino-compatible bootloader.

All 26 general-purpose I/O lines on the ATmega32U4 are accessible on the A* 32U4 Mini; 7 of these are usable as PWM outputs and 12 are usable as analogue inputs. The board measures 1.9"— 0.7", the same size as an Arduino Micro, and features a pair of mounting holes sized for #2 or M2 screws (not included). Its 0."³ pin spacing makes the A* easy to use with solderless breadboards, perfboards, and 0."³-pitch connectors.

FEATURES

• Dimensions: 1.9" x 0.7" (1.95" x 0.7" including USB Micro-B connector)
• Programmable 16 MHz Atmel ATmega32U4 AVR microcontroller
  • 32 KB flash (4 KB used by bootloader, leaving 28 KB available for user program by default)
  • 2.5 KB SRAM
  • 1 KB EEPROM
  • Native full-speed USB (12 Mbps)
• Preloaded with Arduino-compatible bootloader (no external programmer required)
• All I/O lines from the ATmega32U4 broken out in a compact package
  • 26 general-purpose I/O pins available along the sides of the board
  • 7 pins can be configured as hardware PWM outputs
  • 12 pins can be configured as analogue inputs
• 3 user-controllable LEDs
• Reset button
• Can be powered from USB or from an external source:
  • SV: 5 V to 40 V
• Switching regulator enables efficient low-power operation
• Power selection circuit with seamless switching between power sources and overcurrent protection
• Reverse-voltage protection on external power inputs
• Precision 16 MHz crystal
• 6-pin ISP header for use with an external programmer

RESOURCES

• Users Guide