Elite-C| Host port |
USB Type C |
|---|
| Microcontroller |
ATMega32U4 |
|---|
| Voltage |
5V |
|---|
| Clock speed |
16 MHz |
|---|
| Digital I/O pins |
24 |
|---|
| I/O Voltage |
5V |
|---|
| RAM |
2.5 KB |
|---|
| Program memory |
32 KB |
|---|
| EEPROM |
1 KB |
|---|
| Boot loader |
DFU |
|---|
A picture of an Elite-C V4.0
The Elite-C is a proprietary microcontroller board, made to be backwards-compatible with the Pro Micro. Its main features are a USB type C port and more IO pins.
Differences to the Pro Micro
Changes
- The USB port is now USB type C mid-mount, which is both through-hole and SMD mounted. It should be tougher and not as easily torn off as the USB micro B port on the original Pro Micro.
- The RAW pin on the Pro Micro has been replaced with PB0.
- The bootloader is DFU.
- The silk-screened print on the board lists the actual ATmega32U4 port and bit numbers, not Arduino numbering.
Additions
- Five additional I/O pins are exposed on the short edge. (PBO replaces the old RAW pin, for a total of six new I/O pins, making the total 24 out of the ATmega32U4's 26)
- There are also holes for the USB port, for an external USB breakout board.
- A physical reset button.
Omissions
- No indicator LEDs. The pins are instead available.
- It has no voltage regulator and runs only on +5V.
Version history
Version 1
- There is no on-board LED.
Version 2
- A power LED was added, in the same position as on the Pro Micro.
- A 500mA fuse was added for overcurrent protection.
Version 3.0
- Castellated holes for flush mounting (where supported by a PCB).
- A bad choice of the VBUS diode makes Master/Slave detection in split keyboards by checking VBUS not possible. (See below)
Version 3.1
- The VBUS bug of version 3.0 is fixed.
- The power LED was changed to blue and given a resistor so as to be less bright.
- The reset button was exchanged for one with lower profile.
Version 3.1M
- Small run transition PCB version
- USB-C port changed to mid-mount type, board thickness changed to 1.6mm to accommodate
Version 4.0
- VBUS pin added above pin B0, to allow proper use of external USB ports
- The reset button was exchanged for one with even lower profile.
- USB-C port changed to mid-mount type, board thickness changed to 1.6mm to accommodate
- USB-C port is now the limiting factor to thinness of the board.
Compatibility
- It is pinout-compatible with the Pro Micro, except that the RAW pin has been replaced with PB0. This poses a problem for a few keyboard PCBs that use VBUS to power other components (such as through a separate voltage regulator).
- The USB port is slightly larger than the Micro-B port on the Pro Micro. This has caused problems with a few keyboard cases. (The board thickness has been reduced to alleviate this)
- The reset button also adds thickness compared to the Pro Micro. It was was replaced with a lower-profile button in version 3.1.
Bugs
- On some V1.0 boards, the Shottky diode is not soldered on properly.
- Version 3.0 uses a Schottky diode between VBUS and Vcc which has noticeable reverse leakage current. This makes automatic Master/Slave detection on split keyboard not work.[1] This was fixed in version 3.1. A workaround for QMK involves adding #define SPLIT_USB_DETECT in config.h. This enables another detection method that instead waits after startup to check if a USB connection with a host exists.
- Versions older than v4.0 don't have VBUS broken out, causing possible difficulty using external USB ports properly.
Pinout
| Arduino
|
AVR
|
↑
|
AVR
|
Arduino
|
|
|
USB port
|
|
|
|
 Elite-C V4 Pinout Diagram |
|
|
|
|
| TX
|
D1
|
PD3
|
PB0 (was RAW on Pro Micro)
|
| RX
|
D0
|
PD2
|
GND
|
| GND
|
Reset
|
| GND
|
Vcc (+5V)
|
| SDA
|
D2
|
PD1
|
PF4
|
D21
|
A3
|
| SCL
|
D3
|
PD0
|
PF5
|
D20
|
A2
|
| A6
|
D4
|
PD4
|
PF6
|
D19
|
A1
|
|
|
D5
|
PC6
|
PF7
|
D18
|
A0
|
| A7
|
D6
|
PD7
|
PB1
|
D5
|
SCLK
|
|
|
D7
|
PE6
|
PB3
|
D14
|
MISO
|
| A8
|
D8
|
PB4
|
PB2
|
D16
|
MOSI
|
| A9
|
D9
|
PB5
|
PB6
|
D10
|
A10
|
|
|
PB7
|
PD5
|
PC7
|
PF1
|
PF0
|
|
References
