Arduino compatible boards are normally using Microphip Atmel microcontrollers, but as we’ve see with GD32 clone of STM32 MCU, some companies are making MCU clones too, usually with some improvements, and LogicGreen designed LGT8F328P micro-controller (mostly) compatible with Atmel ATMega328P micro-controller and adding features such as DAC output, PWM specific features, a computing accelerator (DSC), and others. The MCU also runs at double the clock speed (32 MHz).
I found out about the new MCU via Electrodragon selling EDMINI Arduino compatible development board based on LGT8F328P micro-controller for $1.40. The board looks to be a clone of Arduino Pro Mini.
- MCU – LogicGreen 8F328 (LGT8F328P) MCU – 99% compatible with ATMEGA328P MCU
- Expansion – Same pins as Arduino Pro Mini plus SWD/SWC pins, PE4/PE5 pins
- Misc – On-board power LED, D13 LED, reset button
- Power Supply – 5V RAW as VCC directly in; regulated 3.3V as VCC
The board does not include any external crystal, as the IC embeds a 16Mhz crystal internally. The board comes pre-loaded with a bootloder for the MCU, and you can programming it with Arduino IDE directly.
The MCU extra features compared to ATMega328P are shown in the comparison table below.
|Internal reference resolution||±0.5%||±1.5%|
|PWM dead zone control||Yes||–|
|High current push – pull PWM||Yes||–|
|Computing Accelerator (DSC)||Yes||–|
|Stacking expansion system||Yes||–|
If you are interested in the chip itself, LogicGreen sells it on Taobao in three different packages:
- SSOP20 – 1.80 RMB ($0.29)
- LQFP32 – 2.80 RMB ($0.45)
- LQFP48 – 2.90 RMB ($0.46)
If you can read Chinese, you should also find more information on the product page.
Thanks to Zoobab for the tip