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Next μ
Next μ or Next Micro is a Pro Micro/Elite-C compatible ATmega32U4 board, specialized design for keyboards.
It has mid-mount USB Type-C and more available pins (25 pins, all pins of ATmega32U4 except PE2/HWB) than both Pro Micro (18 pins) and Elite-C (24 pins).
The on-board RESET button makes development easier.
A part of ErgoSNM keyboard project.
Preview
| Front | Back | Layers |
|---|---|---|
 |  |  |
Pinouts
| Func | 32U4 | L <-> R | 32U4 | Func |
|---|---|---|---|---|
| PB7* | PB0 | |||
| TX | PD3 | RAW | ||
| RX | PD2 | GND | ||
| GND | RESET | |||
| GND | VCC | |||
| SDA | PD1 | PF4 | A3 | |
| SCL | PD0* | PF5 | A2 | |
| A6 | PD4 | PF6 | A1 | |
| PC6* | PF7 | A0 | ||
| A7 | PD7* | PB1 | SCLK | |
| PE6 | PB3 | MISO | ||
| A8 | PB4 | PB2 | MOSI | |
| A9 | PB5* | PB6* | A10 |
Bottom row from left to right: PD6, PD5, PC7*, PF1, PF0.
- The pin marked with
*can output PWM. - RAW: LDO Vin pin.
The pinouts not fully compatible with Elite-C.
Jumper Config
- JP1: LDO bypass.
- Open: VCC is 3.3V (LDO Vout).
- Closed: VCC is 5V (VBUS or RAW).
BOM
| Designator | Value | Footprint |
|---|---|---|
| C1,C2 | 20pF | 0402 (1005 Metric) |
| C3,C6,C7 | 100nF | 0402 (1005 Metric) |
| C4,C5,C8,C9 | 1uF | 0402 (1005 Metric) |
| D1 | B5817 | SOD-323 |
| F1 | 500mA, 6V | 0805 (2012 Metric) |
| J1 | USB_C_Receptacle_USB2.0 | 918-418K2024S40000 |
| R1,R2 | 5.1k | 0402 (1005 Metric) |
| R3,R4 | 22 | 0402 (1005 Metric) |
| R5 | 10k | 0402 (1005 Metric) |
| SW1 | RESET | B3U-1000P |
| U1 | ATmega32U4-M | QFN-44-1EP 7x7mm P0.5mm EP5.2x5.2mm |
| U2 | RT9013-33GB | SOT-23-5 |
| Y1 | 8MHz | 2Pin 5x3.2mm |
See also
doc/next-micro_bom.csv.
There is not designator silkscreen on PCB, please use your browser to open the ibom.html file (placed in release page and doc/) to refer to the placement of the parts, it is generated by Interactive HTML BOM plugin.
PCBA
The BOM and CPL files for PCBA are placed in the doc/ folder and release page.
Board Characteristics
- Copper layer count: 2
- Board thickness: 1.6 mm
- Board overall dimensions: 17.78 x 33.02 mm (0.7 x 1.3 inch)
- Min track/spacing: 0.13 mm / 0.13 mm
- Min hole diameter: 0.3 mm
- Castellated pads: No
- Edge card connectors: No
- Plated board edge: No
Disclaimer
These files without warranty of any kind, use at your own risk, it is recommended to check yourself before manufacture.
For the full statement, please see LICENSE.