A-Star 32U4 Prime LV microSD

Pololu A-Star 32U4 Prime LV microSD
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Price: £22.68
(£18.90 + VAT)
Availability: 5
Model: 3108
Manufacturer: Pololu
Average Rating: Not Rated

Pololu

A-Star 32U4 Prime LV microSD

The Pololu A-Star 32U4 Prime is a general-purpose programmable board based on Atmel’s ATmega32U4 AVR microcontroller 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.

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.

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)
  • Preloaded with Arduino-compatible bootloader (no external programmer required)
  • 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
  • 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 2.7 V to 11.8 V source (with several access points for connecting external power)
    • 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 provides seamless switching between power sources, overcurrent protection, and feedback about which power source is selected
  • 6-pin ISP header for use with an external programmer
  • Comprehensive user’s guide

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. The input voltage is regulated to 5 V by a TPS63061 switching step-up/step-down (buck-boost) converter from Texas Instruments. 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.

Documents

Pinout and Power Connections
Schematic Diagram

 

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A-Star 32U4 Prime LV microSD
Click to enlarge
A-Star 32U4 Prime LV microSD
Click to enlarge
A-Star 32U4 Prime LV microSD
Click to enlarge
A-Star 32U4 Prime LV microSD
Click to enlarge
A-Star 32U4 Prime LV microSD
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