Differences to the genuine Arduino Nano R3 board To switch between VIN power supply (6-12 V) and USB power supply, the board includes a Schottky diode with low forward voltage. Most of the boards I got seems to be using the Vishay Semi SD101CWS diode (Vf 0.6 – 0.8 V at 20 mA, S4 SMD marking code). With installed driver, communication with Arduino (IDE) is clear and straightforward.
#ARDUINO NANO PINOUT DIAGRAM DRIVER#
The CH340 IC requires installation of driver software, which was covered and explained many times already, so I will not repeat this information. To facilitate the USB communication and to provide 3.3 V output, the board uses USB communication circuit CH340 in SOP-16 package (instead of FT232RL used on the genuine Nano R3 board), manufactured by several Chinese companies. 500 mA of original UA78M05) and lower drop-out voltage (typ. To provide +5.0 V Vcc power supply, the board uses LM1117-5.0 SOT-223 linear stabilizer 5.0 V (compared to original UA78M05), with slightly higher current (800 mA vs. There are also 4 LEDs – Power LED, LED connected to digital output pin D13, and two LEDs showing status of the RxD and TxD communication lines. The board uses same type of Mini-B USB connector, same side connectors and 6-pin SPI connector, as well as the Atmel ATmega328P microcontroller in the 32-TQFP package. The Nano CH340 R3 board is similar to the genunine Arduino Nano board, described on the original Arduino website here . Below you will find both schematics and few technical comments to the Nano CH340 R3 development board. I have purchased several Nano 3.0 CH340 clones in different orders from several Asian vendors and they are all almost identical, so it seems that this type of the Nano 3.0 board is widely used. This is a case for a Chinese clones of the Arduino Nano R3 board as well.Īfter some research, measurements and detail inspection of the boards I was able to get together all circuits. Unfortunately, quite often there is virtually no schematics, datasheets or detail description available. Although in most cases the functionality is similar or even identical to the original, there may be some differences. Because of substantial price difference, many users are using Chinese clones of the genuine Arduino development boards.
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