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ATMega32U4 Arduino board, available from SparkFun Electronics

License: Other

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arduino-boards sparkfun-products microcontroller atmega32u4 qwiic

pro_micro's Introduction

SparkFun Pro Micro and Qwiic Pro Micro USB-C


Pro Micro - 3.3V/8MHz [DEV-12587]	Pro Micro - 5V/16MHz [DEV-12640]	Qwiic Pro Micro - USB-C (ATmega32U4) [DEV-15795]

The Pro Micro is a microcontroller with an ATMega32U4 IC on board. The USB transceiver is inside the 32U4, adding USB connectivity on-board without external USB interfaces. The Pro Micro comes in both a 3.3V and 5V version. For users using the Qwiic Pro Micro USB-C, the board includes a jumper to select either 5V or 3.3V, reset button, castellated pads, and Qwiic connector. The USB connector and voltage regulator are also different.

Repository Contents

/Documentation - Data sheets (.pdf and .svg)
/Firmware - Arduino example code used in the hookup guide
/Hardware - All Eagle design files (.brd, .sch, .STL)
/Production - Test bed files and production panel files

Documentation

Hookup Guide
- Pro Micro & Fio V3 - Basic hookup guide for the Pro Micro (ATmega32U4) 3.3V and 5V versions as well as the Fio V3.
- Qwiic Pro Micro USB-C - Basic hookup guide for the Qwiic Pro Micro.
SparkFun Arduino Board Addon - Arduino board addon for Qwiic Pro Micro.
SparkFun Graphical Datasheets - Graphical datasheets for various SparkFun products.
SparkFun Fritzing repo - Fritzing diagrams for SparkFun products.

Product Versions

DEV-15795- 5V/16MHz version with Qwiic connector and USB C
DEV-12640- 5V/16MHz version
DEV-12587- 3.3V/8MHz version

License Information

This product is open source!

Please review the LICENSE.md file for license information.

If you have any questions or concerns on licensing, please contact technical support on our SparkFun forums.

Distributed as-is; no warranty is given.

Your friends at SparkFun.

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pro_micro's Issues

Pro Micro v 1.3 schematic has Arduino IDE pin 14 and 17 labels swapped

Arduino Pin 14 is 32U4 pin 11/MISO and Arduino Pin 17 is 32U4 pin 8/SS which is connected to the RXLED

USB-C Connector Source

What's the source for the USB-C connector?
There doesn't seem to be a library available with the package being used.
I'm looking to get the 3D model for it.

SS & MISO swapped on 32U4

From the Pro Micro schematic it appears that SS & MISO pins are swapped on the ATMEGA32U4 ucontroller component in the Testing library. According to the Atmel data sheet pin 8 should be PB0(SS) and pin 11 should be PB3(MISO). Note this appears to be an issue with library component pin names only. Schematic signal names and use appear to be correct.

This has caused a couple of questions in the forum: https://forum.sparkfun.com/viewtopic.php?f=14&t=41432

Thanks,
Chip

OC4x Pins are incorrectly marked on the Graphical Datasheet

The datasheet correctly lists OC4D as on PD7 (pin 6 on the Pro Micro), but it gets the pins for OC3A and OC3B wrong:

OC4A is on PC7 (not broken out on the Pro Micro), not pin 5 as listed in the datasheet (which in reality has OC4A's complementary output).
OC4B is on PB6 (pin 10 on the Pro Micro), not pin 9 as listed in the datasheet (which in reality has OC4B's complementary output).

(This can all be verified in section 10.3 (page 70) of the ATmega16/32U4 Full Datasheet)

I discovered this issue while creating a library to generate high-speed PWM (up to 250kHz!) using the 32u4's cool ability to clock TC4 from the chip's bilt-in PLL. So in addition to creating a headache troubleshooting PWM hacking code, it also is misleading for potential buyers in that it looks like all 3 of TC4's Output Compare units are broken out when in fact only 2 are directly (aside from through complimentary ouputs which are kinda a hackish solution)

Anyways, all this to say, pls fix this in the graphical datasheet!

As an aside, given that high-speed PWM is one of (IMO) the top 5 coolest features of the ATmega32u4, it would be cool if you someday released a tiny Atmega32u4-based board that broke out all 6 outputs (all 3 regular and inverted) for the TC4-based PWMs. This would enable all sorts of cool applications, like directly controlling FETs for a homebrew RGB LED sync buck driver, or homebrew 3-phase BLDC drivers, a kinda hackish 3-output SMPS, and many more possibilities! My own project only needs 2 HSPWMs, so I got lucky, but I think a microcontroller board with 3 high-speed PWMs, inverted outputs, and dead-time generation could be a big selling feature!