CH340G Replace ATMEGA16U2  Microcontroller:ATmega2560  Operating Voltage:5V  Input Voltage (recommended):7-12V  Input Voltage (limits):6-20V  Digital I/O Pins:54 (of which 15 provide PWM output)  Analog Input Pins:16  DC Current per I/O Pin:40 mA  DC Current for 3.3V Pin:50 mA  Flash Memory:256 KB of which 8 KB used by bootloader  SRAM:8 KB  EEPROM:4 KB  Clock Speed:16 MHz