Data Sheet

Typical dropout voltage of the 5 V regulator

on the A-Star 32U4 Prime SV.

Note: Although the ISL85410 is rated for a maximum operating input voltage of 36 V, it is not appropriate

to power the Prime SV with a 36 V battery, as battery voltages can be much higher than nominal voltages

when they are charged. The maximum nominal battery voltage we recommend is 24 V, and if you approach

that limit, you should take extra precautions to prevent LC voltage spikes from damaging the board (see

this application note [http://www.pololu.com/docs/0J16] for more information). A good practice is to ensure

that the A-Star’s power switch is off before connecting it to a voltage source.

5.5. A-Star 32U4 Prime schematic

Schematic diagram

The schematic diagrams for the A-Star 32U4 Primes are available as PDFs:

• A-Star 32U4 Prime LV schematic diagram [http://www.pololu.com/file/download/a-

star_32u4_prime_lv_schematic_diagram.pdf?file_id=0J846] (1MB pdf)

• A-Star 32U4 Prime SV schematic diagram [http://www.pololu.com/file/download/a-

star_32u4_prime_sv_schematic_diagram.pdf?file_id=0J856] (1MB pdf)

5.6. A-Star 32U4 Prime demo program

The A-Star 32U4 Prime LV microSD with LCD [http://www.pololu.com/product/3109] and A-Star 32U4 Prime SV

microSD with LCD [http://www.pololu.com/product/3115] each come preloaded with a program that demonstrates many

of its features and allows you to test that it is working correctly, and this demo program will run when you first turn

on the board.

The demo program uses the standard A-Star 32U4 Prime LCD pins, buzzer pin, button pins, microSD

pins, and pin 4. To avoid damage or improper operation, if you have shields or other electronics connected,

make sure they do not use those pins in a conflicting way.

5. A-Star 32U4 Prime Page 29 of 47