5.7 KiB
FC980C Alt controller
2017/07/11
This keyboard is very similar to FC660C hardware.
FC660C Alt Controller: https://geekhack.org/index.php?topic=88439.0
Firmware
Just make to build firmware. And consult with wiki for further information.
https://github.com/tmk/tmk_keyboard/wiki
Pinouts
ATMega32u4 pin configuration is temporary for test with FC660C Alt controller.
|Switch |Controller |
| board | board |Description |Function |ATmega32u4
|--------|-----------|--------------------------------------|-----------|------------
| 1 |20 | FG |FG |GND
| 2 |19 | GND |GND |GND
| 3 |18 | GND |GND |GND
| 4 |17 | 3.3V |V33 |3.3V/5V
| 5 |16 | 5V |Vcc |5V
| 6 |15 |*Z6-TP1684-4-HYS(o) |KEY_HYS |PC7
| 7 |14 |*Z6-TP1684-2-KEY(i) |KEY_STATE |PC6
| 8 |13 |*Z7-AD5258-5-SCL(I2C) |I2C_CCL |PD0(TWI)
| 9 |12 |*Z7-AD5258-4-SDA(I2C) |I2C_SDA |PD1(TWI)
|10 |11 |*Z5/4-LV4051A-6-~EN(Lo:Z5 Hi:Z4) |COL_bit3 |PB4 PB3
|11 |10 |+Z3-LV07A-5 (LV4051A-9-C) |COL_bit2 |PB3 PB2
|12 | 9 |+Z3-LV07A-1 (LV4051A-10-B) |COL_bit1 |PB2 PB1
|13 | 8 |+Z3-LV07A-3 (LV4051A-11-A) |COL_bit0 |PB1 PB0
|14 | 7 |+Z1-LVC138A-3-C |ROW_bit2 |PB0 PD6
|15 | 6 |+Z1-LVC138A-2-B |ROW_bit1 |PD6 PD5
|16 | 5 |+Z1-LVC138A-1-A |ROW_bit0 |PD5 PD4
|17 | 4 |+Z1-LVC138A-4-~G2A Z6-TP1684-5-~EN |KEY_ENABLE |PD4 PD7
|18 | 3 |+Q4-MOSFET-G-NumLock_LED(Hi:On) |LED_NUML |PD7 PB4
|19 | 2 |+Q3-MOSFET-G-CapsLock_LED(Hi:On) |LED_CAPS |PB5
|20 | 1 |+Q2-MOSFET-G-ScrollLock_LED(Hi:On) |LED_SCRL |PB6
* 5V intferface
+ 3.3V interface
- Connector on Switch board: https://i.imgur.com/Zi89xO5.jpg
- Connector on Controller board: https://i.imgur.com/9SZUzYo.jpg
Key Matrix
| |0 |1 |2 |3 |4 |5 |6 |7 |8 |9 |A |B |C |D |E |F |
|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|
| 0|Left|RCtl|RAlt| |Down|P. |Righ|P0 |X |LGui|` |V | |Esc |M |Spc |
| 1|Fn |. | | |P1 |PEnt|P2 |P3 |Z |LAlt|RCtl|C |K | |N |B |
| 2|' |/ |, | |P4 |P+ |P5 |P6 |D |A |LSft|F |J |F1 |H |G |
| 3|RSft|; |L |] |Up | | | |S |Q |Caps|R |I |F3 |U |T |
| 4| | | | | | | | | | | | | | | | |
| 5|= |- |0 |\ |NLck|BSpc|P/ |P* |3 |2 | |4 |9 |F2 |7 |6 |
| 6|[ |P |O |Ent |P7 |P- |P8 |P9 |W |1 |Tab |E |8 |F4 |Y |5 |
| 7|F11 |F10 |F9 |F12 |Del |PgDn|Ins |PgUp| | | | |F8 |F5 |F7 |F6 |
Logic analyzer pics:
This code emuluates what original cotnroller does for matrix scan.
Row designation
LV138A(Z1) selects a row line and gives strobe by enabling with ~G2A(18).
|Row |A/16|B/15|C/14|
|----|----|----|----|
|0 |0 |0 |0 |
|1 |1 |0 |0 |
|2 |0 |1 |0 |
|3 |1 |1 |0 |
|4 |0 |0 |1 |
|5 |1 |0 |1 |
|6 |0 |1 |1 |
|7 |1 |1 |1 |
Column designation
LV4051A(Z4, Z5) select one of 16 column lines to sense capacitance of switches.
|Col |A/13|B/12|C/11|Z4/5-EN/10|
|----|----|----|----|----------|
|0 |0 |0 |0 |0 |
|1 |1 |0 |0 |0 |
|2 |0 |1 |0 |0 |
|3 |1 |1 |0 |0 |
|4 |0 |0 |1 |0 |
|5 |1 |0 |1 |0 |
|6 |0 |1 |1 |0 |
|7 |1 |1 |1 |0 |
|8 |0 |0 |0 |1 |
|9 |1 |0 |0 |1 |
|A |0 |1 |0 |1 |
|B |1 |1 |0 |1 |
|C |0 |0 |1 |1 |
|D |1 |0 |1 |1 |
|E |0 |1 |1 |1 |
|F |1 |1 |1 |1 |
Datasheets
- Hirose DF14A-20P-1.25H: http://www.mouser.com/ds/2/185/DF14_catalog-939195.pdf
- LV07A: http://www.ti.com/lit/ds/symlink/sn74lv07a.pdf
- LV138A: http://www.ti.com/lit/ds/symlink/sn74lvc138a.pdf
- LV4051A: http://www.ti.com/lit/ds/symlink/sn74lv4051a.pdf
- AD5258: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
3.3V power supply
LV07A and LVC138A are 5V-tolerant and can be powered with 5V, the keyboard will work only with 5V power supply. It may not be completely safe to operate LV138A with 5V Vcc, its datasheet says:
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Digipot AD5258
Controller can operate AD5258 via I2C to change actuation point of keys. This may make keyboard unusable accidentally and it will be difficult to recovery in some situation. For safety firmware doesn't support it at this point, though.
Lower value of RDAC register causes shallower actuation point.
Resources
- Pics: http://imgur.com/a/HhyIq