A-Star 32U4 Mini SV

The A-Star 32U4 Mini SV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-down regulator that allows it to be powered efficiently from a 5 V to 36 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.
Dimensions
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 36 V (SV)
Minimum operating voltage: 5 V
Maximum operating voltage: 36 V
Maximum output current: 500 mA4
Logic voltage: 5 V
Reverse voltage protection?: Y5
External programmer required?: N
Notes:

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 Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology. See product documentation and performance graphs for details.
5 On Bat+ (LV, SV) or Bat- (ULV).