Pololu A-Star 32U4 Mini SV 5 V to 40 V, Programmable Module ATmega32U4

Artikelnummer: PO3145

The A-Star 32U4 Mini SV is a programmable module based on the ATmega32U4 from Microchip (formerly Atmel). Unlike competing products, it has an on-board 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 analog inputs), and loading programs is made easier by a Micro-USB interface and a preloaded Arduino-compatible bootloader.

Kategorie: Board

14,95 €

inkl. 19% USt.,

3 Packung auf Lager

Lieferfrist: ca. 1 - 3 Tage




The Pololu A-Star 32U4 Mini boards are general-purpose programmable modules based on the ATmega32U4 AVR microcontroller from Microchip (formerly Atmel), which has 32 KB of flash program memory, 2.5 KB of RAM, and built-in USB functionality. The A-Star (abbreviated A*) adds a number of onboard features to support the microcontroller and make it easier to work with, including a 16 MHz crystal, a USB Micro-B connector, an in-system programming (ISP) header, a reset button, and three indicator LEDs.

Each A-Star 32U4 Mini contains a switching regulator that efficiently produces 5 V from an external voltage source to power the microcontroller. Three different versions are available, covering a wide range of input voltages:

  • A-Star 32U4 Mini ULV: 0.5 V to 5.5 V
  • A-Star 32U4 Mini LV: 2.7 V to 11.8 V
  • A-Star 32U4 Mini SV: 5 V to 40 V

A robust power selection circuit enables seamless transitions between regulator power and USB power, and overcurrent and reverse-voltage protection help safeguard the board against accidental damage.

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 analog 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 0.1" pin spacing makes the A* easy to use with solderless breadboards, perfboards, and 0.1"-pitch connectors.

This product requires a USB A to Micro-B cable (not included) to connect to a computer.

Note: Batteries can have much higher voltages than their nominal voltages when fully charged, so be careful with nominal voltages above 24 V. A 36 V battery is not appropriate for this product.


  • Dimensions: 1.9" × 0.7" (1.95" × 0.7" including USB Micro-B connector)
  • Programmable 16 MHz 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 analog inputs
  • 3 user-controllable LEDs
  • Reset button
  • Can be powered from USB or from an external source:
    • ULV: 0.5 V to 5.5 V
    • LV: 2.7 V to 11.8 V
    • SV: 5 V to 40 V
  • Switching regulator enables efficient operation
  • Power selection circuit allows for seamless switching between power sources and provides overcurrent protection
  • Reverse-voltage protection on external power inputs
  • Precision 16 MHz crystal
  • 6-pin ISP header for use with an external programmer


Size: 0.7" × 1.95" × 0.23"1
Weight: 3.4 g2

General specifications

Processor: ATmega32U4 @ 16 MHz
RAM size: 2560 bytes
Program memory size: 32 Kbytes3
Motor channels: 0
User I/O lines: 26
Input voltage range: 5 V to 40 V (SV)
Minimum operating voltage: 5 V4
Maximum operating voltage: 40 V
Maximum output current: 800 mA5
Logic voltage: 5 V
Reverse voltage protection: Y6
External programmer required: N


1: Without included optional headers. This measurement includes the USB Micro-B connector, which extends 0.05" past the edge of the PCB.
2:Without included optional headers.
3: Note that 4 KB of the MCU's 32 KB of flash memory is used by the pre-installed USB bootloader. All 32 KB is available when programming via the ISP header rather than the bootloader.
4: For light loads. The regulator's dropout voltage increases approximately linearly with the load, from a few millivolts at no load up to around 0.6 V at 500 mA.
5: Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology. See product documentation and performance graphs for details.
6: On Bat+ (LV, SV) or Bat- (ULV).

Package List

1x Pololu A-Star 32U4 Mini SV

2x 1×17-pin breakaway 0.1" male headers

1x 2×3 header



Pinout diagram

drivers for Windows (version

Dimension diagram

3D model

Drill guide

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