$1.40 EDMINI Development Board Features LogicGreen LGT8F328P MCU Compatible with ATMega328P/Arduino

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.

Main specifications for EDMINI board:

  • 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.

Board Schematics – Click to Enlarge

Electrodragon also provided more details in their Wiki, and some documents and tools (schematics, SDK, 8F328 datasheet (in Chinese), etc..) can be downloaded directly on LogicGreen website.

The MCU extra features compared to ATMega328P are shown in the comparison table below.

Features LGT8F328P ATMega328P
DAC output Yes
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
Speed 32M 16M

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

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chiptron
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Datasheet is only paper. You can write what do you want. The problem is, if the specification from datasheet is false. The good manufacturer will try to find the problem… these chinese “manufactures” just fu** you…
I don’t think so that this uC (GD32F103 die) will be e.g. faster during all conditions
https://zeptobars.com/en/read/GD32F103CBT6-mcm-serial-flash-Giga-Devices

Jonathan
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Jonathan

GD32 chips with 20Kb of SRAM or less have no more than 128KiB of flash, so all flash content is served from SRAM. This might also mean that startup time is slower than one would expect. With this SRAM mirroring it is not surprising that GD32 is beating STM32 in performance even on the same frequency and loosing in idle & sleep power consumption.

Cute! If you’ve got time to waste on reset and power to waste during idle and sleep, it looks like GD32 wins.

Kamil
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Kamil

“LogicGreen 8F328 MCU – 99% compatible with ATMEGA238P MCU”

It isn’t product for me. I don’t want to research where is 1 % incompatibility.

itchy+n+scratchy
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itchy+n+scratchy

They could have invested their time in the development of a riscV uC instead, so I know its 0% compatible with AVR 😉

zoobab
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I also found Wemos has a similar board named Arduino XI the same chip with Arduino IDE support.

willmore
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willmore

MCU – LogicGreen 8F328 (LGT8F328P) MCU – 99% compatible with ATMEGA238P MCU

Typo there? ATMEGA328P, no?

mark biasotti
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mark biasotti

Careful of RAW input. I hooked up a 13.2 VDC wall brick to it and blew the on-board LM1117 which should be rated for up to 15V.