# A-Star 32U4 Prime LV (SMT Components Only)

 Pololu item #: 3105 57 in stock Brand: Pololu Status: Active and Preferred Free shipping in USA over $60 Price break Unit price (US$)
1 19.95
5 17.76
25 15.55
100 13.95

 Quantity: backorders allowed

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 2.7 V to 11.8 V. The A-Star 32U4 Prime LV is available in several configurations; item #3105 has no microSD support and does not include any through-hole components; it is intended for those who want to customize the way it is assembled.

## Overview

The Pololu A-Star 32U4 Prime is a general-purpose programmable board based on the ATmega32U4 AVR microcontroller from Microchip (formerly Atmel) and arranged in the common Arduino form factor exemplified by the Uno R3 and Leonardo. As such, the A-Star Prime (abbreviated A* Prime) is compatible with many Arduino shields, including all of the Arduino shields we carry. All 26 of the microcontroller’s GPIO lines are accessible on the board, including seven than can be used as PWM outputs and twelve that can be used as analog inputs. The ATmega32U4 is capable of native full-speed USB, which makes it more versatile than similar boards that rely on USB-to-serial adapters: in addition to supporting a virtual (CDC) serial/COM port interface, the A-Star can appear to a connected computer as a mouse and keyboard. The A-Star’s USB interface can be accessed through its USB Micro-B connector.

The A* Prime supports the on-board microcontroller with many additional features and improvements over competing products, including enhanced connectivity and superior power management. The Prime is available in two main versions: LV, which features a blue solder mask and a step-up/step-down voltage regulator that allows operation from 2.7 V to 11.8 V, and SV, which features a green solder mask and a switching step-down regulator that allows operation from 5 V to 36 V. Each version is available in several different configurations: with or without preinstalled through-hole components like standard Arduino female headers and with or without microSD support. There is also a configuration available for each version with an 8×2 character LCD.

A-Star 32U4 Prime LV (2.7 V to 11.8 V) configurations:

A-Star 32U4 Prime SV (5 V to 36 V) configurations:

We carry an A-Star Prime accessory pack that contains an assortment of parts you might want when assembling the configurations without preinstalled headers (items #3105, #3106, #3111, and #3112).

Our comprehensive user’s guide provides the basics you need to get started with the A-Star as well as detailed technical information for advanced users.

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

## Features

• Programmable ATmega32U4 MCU with 32 KB flash, 2.5 KB SRAM, 1 KB EEPROM, and native full-speed USB (clocked by precision 16 MHz crystal oscillator)
• All 26 general-purpose I/O lines from the ATmega32U4 are broken out (including PB0, PD5, and PE2); 7 of these can be used as hardware PWM outputs and 12 of these can be used as analog inputs
• Convenient 0.1″-spaced power, ground, and signal connection points
• Buzzer option for simple sounds and music
• microSD support (microSD version only)
• HD44780-based character LCD option
• 3 user-controllable LEDs
• 3 user pushbuttons
• Reset button
• Power features:
• Can be powered from USB or from an external source (with several access points for connecting external power)
• LV operating range: 2.7 V to 11.8 V
• SV operating range: 5 V to 36 V
• Switching 5 V regulator enables efficient operation
• 3.3 V rail supplied by 300 mA linear regulator
• Power switch for external power inputs
• Reverse-voltage protection on external power inputs
• Power selection circuit allows for seamless switching between power sources while providing overcurrent protection and feedback about which power source is selected
• 6-pin ISP header for use with an external programmer
• Comprehensive user’s guide

## Details for item #3105

This configuration of the A-Star 32U4 Prime LV does not offer microSD support and does not include any through-hole components. It ships as shown in the picture above, without any headers, a buzzer, or DC power jack. This configuration is intended for those who want to customize the way the board is assembled. We carry an A-Star Prime Accessory Pack that consists of a variety of through-hole components that can be installed on this board, including the parts necessary to make it just like our more assembled configurations (male and female 2×7 LCD headers are part of the accessory pack, but the LCD is sold separately). This is the LV version of the A-Star Prime, which operates from 2.7 V to 11.8 V.

## A-Star 32U4 Prime LV 5 V regulator

A major feature of the A* Prime LV is its power system, which allows it to efficiently operate from a 2.7 V to 11.8 V external source. Like on the smaller A-Star 32U4 Mini LV, the input voltage is regulated to 5 V by a TPS63061 switching step-up/step-down (buck-boost) converter from Texas Instruments. (We also make a standalone regulator based on this integrated circuit.) The regulator’s flexibility in input voltage is especially well-suited for battery-powered applications in which the battery voltage begins above 5 V and drops below 5 V as the battery discharges. Without the typical restriction on the battery voltage staying above 5 V throughout its life, a wider range of battery types can be considered. For example:

• A 4-cell battery holder, which might have a 6 V output with fresh alkalines or a 4.0 V output with partially discharged NiMH cells, can be used to power this A*.
• A disposable 9 V battery powering the board can be discharged to under 3 V instead of cutting out at 6 V, as with typical linear or step-down regulators.

As shown in the left graph below, the LV’s 5 V switching regulator has an efficiency – defined as (Power out)/(Power in) – of 80% to 90% for most combinations of input voltage and load.

The A-Star’s components, including the microcontroller and LEDs, draw 30 mA to 40 mA in typical applications (without the buzzer, microSD card, or an LCD). The rest of the regulator’s achievable output current, which depends on input voltage as well as ambient conditions, can be used to power other devices. The blue line in the right graph above shows output currents at which the voltage regulator’s over-temperature protection typically kicks in after a few seconds. These currents represent the limit of the regulator’s capability and cannot be sustained for long periods; under typical operating conditions, a safe limit for the maximum continuous regulator output current is 60% to 70% of the values shown in the graph.

## Arduino compatibility

The A-Star 32U4 Prime ships with a preloaded Arduino-compatible bootloader (which uses 4 KB of flash memory, leaving 28 KB available for the user program). We provide a software add-on that enables the board to be easily programmed from the Arduino environment and an Arduino library to make it easy to use the additional on-board hardware. The A-Star 32U4 has the same microcontroller and form factor as the Arduino Leonardo, and it runs at the same frequency, so we generally expect it to work with shields that are compatible with the Leonardo and similar boards. Note that the Prime has additional components and connection points, so you should make sure these do not physically interfere with any shield you are considering using. The following table shows how the Prime compares to the Leonardo and Uno:

Arduino Uno R3 Arduino Leonardo A-Star 32U4 Prime LV A-Star 32U4 Prime SV Microcontroller: ATmega328P ATmega32U4 ATmega32U4 16 MHz resonator 16 MHz crystal 16 MHz crystal 20 23 26 6 7 7 6 12 12 4 4 43 3 3 3 — — 3 B Micro-B Micro-B partial partial TPS2113A 7 V to 12 V 7 V to 12 V 2.7 V to 11.8 V 5 V to 36 V linear linear switchingstep-up/step-down switchingstep-down at 3 V in — — 0.75 A — at 5 V in — — 1.5 A 0.2 A at 7 V in 1.0 A 1.0 A 1.5 A 1.0 A at 9 V in 0.5 A 0.5 A 1.5 A 1.0 A at 11 V in 0.35 A 0.35 A 1.5 A 1.0 A at 24 V in — — — 1.0 A via USBconnector 0.5 A(1) 0.5 A(1) 1.5 A(1) 1.5 A(1) 28 g 20 g 13 g to 33 g

1 With sufficiently capable USB power supply.

## The A-Star family

The A-Star 32U4 Micro is a part of our larger A-Star family, all of whose members are based on AVR microcontrollers and are preloaded with Arduino-compatible bootloaders. The table below shows some key features and specifications of our A-Star microcontroller boards to help you choose the right one for your application.

 ATmega328PB ATmega32U4 24 18 26 26(1) 26(1) 9 7 7 7 7(1) 8 8 12 12 12(1) 6 2 4 43 44 1 2 3 3 3 — — — 3 3 3.3V VCC: 3.8 V to 15 V5V VCC: 5.5 V to 15 V 5.5 V to 15 V ULV: 0.5 V to 5.5 VLV: 2.7 V to 11.8 VSV: 5 V to 40 V LV: 2.7 V to 11.8 VSV: 5 V to 36 V LV: 2.7 V to 11 VSV: 5.5 V to 36 V 3.3 V or 5 V linear 5 V linear 5 V switchingULV: step-upLV: step-up/step-downSV: step-down 5 V switchingLV: step-up/step-downSV: step-down 5 V switchingLV: step-up/step-downSV: step-down 100 mA 100 mA ULV: 500 mALV: 1 ASV: 800 mA 1 A LV: 1 ASV: 1.5 A 1.3″ × 0.7″ 1″ × 0.6″ 1.9″ × 0.7″ 2.8″ × 2.1″ 2.6″ × 2.2″ 1.5 g(3) 1.3 g(3) 3.4 g(3) 13 g to 33 g 14 g to 23 g 1 Some microcontroller resources are used by on-board hardware. 2 These values are rough approximations for comparison purposes. Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology. See product documentation and performance graphs for details. 3 Without included optional headers.

### People often buy this product together with:

(702) 262-6648
Same-day shipping, worldwide