Data Sheet

Size comparison of the Pololu A-Star 32U4 family:

A-Star 32U4 Micro (top), A-Star 32U4 Mini SV

(middle), and A-Star 32U4 Prime SV (bottom).

1. Overview

The Pololu A-Star 32U4 microcontroller boards are

general-purpose programmable modules based on Atmel’s

ATmega32U4 AVR microcontroller, which has 32 KB of

flash program memory, 2.5 KB of RAM, and built-in USB

functionality. Each A-Star (abbreviated A*) adds onboard

components and connectors that support the

microcontroller and make it easier to use. The boards

feature USB interfaces and ship with a preloaded Arduino-

compatible bootloader, and we provide a software add-on

that enables them to be easily programmed from the

Arduino environment. The following sections of this

user’s guide discuss each A-Star in more detail.

A USB A to Micro-B cable

[http://www.pololu.com/product/2072] (not included)

is required to connect an A-Star 32U4 to a

computer.

Features

• 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

• Can be powered from USB or external source regulated to 5 V by onboard regulator

• Reverse-voltage protection on external power input

• 6-pin ISP header for use with an external programmer [http://www.pololu.com/product/1300]

A-Star comparison table

1. Overview Page 3 of 47