A000107

Overview

The Arduino USB 2 Serial Micro (A000107) is a hardware adapter that converts a computer's USB connection into 5-volt serial TX and RX lines. It utilizes an ATmega16U2 microcontroller programmed as a USB-to-serial converter, identical to the chip found on the Arduino Uno. The device features an onboard mini-USB connector and a 5-pin header exposing RX, TX, 5V, Ground, and Reset pins. An onboard polyfuse limits current to 500mA for host protection. Status LEDs indicate power and data activity.

Feature Summary

• Converts USB connectivity to 5-volt serial communication lines
• Includes automatic software reset capability via DTR line mirroring
• Provides onboard current limiting protection through a polyfuse
• Features status indicators for power and transmission activity

Applications

• Programming Arduino Mini boards without integrated USB interfaces
• Establishing serial data communication with other microcontrollers
• Connecting to Arduino Ethernet boards for configuration and debugging

Procurement Notes

Verify the specific revision of the ATmega16U2 firmware when sourcing replacements, as driver requirements vary by operating system. Windows installations require a dedicated .inf file provided in the official documentation package. Ensure the receiving board operates at 5-volt logic levels to prevent damage, as this adapter does not support 3.3-volt logic conversion.

Selection Notes

Select this adapter when a project requires a standalone USB-to-serial bridge for 5-volt logic systems. It is suitable for legacy boards lacking native USB ports. For 3.3-volt logic environments, such as those using the Arduino Zero or GIGA R1 WiFi, this unit is incompatible due to voltage mismatch. Consider boards with native USB if space constraints preclude external adapters.

Part Context

This component belongs to the Arduino accessory ecosystem designed to facilitate development for boards without built-in USB capabilities. It serves as a direct replacement for older FTDI-based adapters in compatible setups. The design mirrors the interface standards established by early Arduino models, ensuring broad compatibility within the open-source hardware community.

Replacement Considerations

Compatible substitutes include third-party clones utilizing the CH340G or CP2102 chips, though these require different drivers. Direct functional equivalents must maintain 5-volt logic levels and expose RX/TX/Reset/GND/5V pins. Verify pinout compatibility with standard FTDI headers before substitution.