This controler replaces original controller of Leopold FC980C and makes the keyboard programmable.
The keyboard is very similar electronically to its sibling model FC660C you can also refer this.
FC660C Alt Controller:
https://geekhack.org/index.php?topic=88439.0Hardware This project uses common and familiar ATmega32u4 but any microcontroller with 5V I/O will work.
You can use dev board like Teensy 2.0 in the market to make your own DIY alt controller.
Or
you can buy preassembled TMK FC980C Alt Controller here:
https://geekhack.org/index.php?topic=91842.0
Schematic of Alt controller
Pin configurationConnector bridging between switch board and controller is Hirose DF14A-20P-1.25H.
|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_SCL |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 |PB3
|11 |10 |+Z3-LV07A-5 (LV4051A-9-C) |COL_bit2 |PB2
|12 | 9 |+Z3-LV07A-1 (LV4051A-10-B) |COL_bit1 |PB1
|13 | 8 |+Z3-LV07A-3 (LV4051A-11-A) |COL_bit0 |PB0
|14 | 7 |+Z1-LVC138A-3-C |ROW_bit2 |PD6
|15 | 6 |+Z1-LVC138A-2-B |ROW_bit1 |PD5
|16 | 5 |+Z1-LVC138A-1-A |ROW_bit0 |PD4
|17 | 4 |+Z1-LVC138A-4-~G2A Z6-TP1684-5-~EN |KEY_ENABLE |PD7
|18 | 3 |+Q4-NPN-B-NumLock_LED(Hi:On) |LED_NUML |PB4
|19 | 2 |+Q3-NPN-B-CapsLock_LED(Hi:On) |LED_CAPS |PB5
|20 | 1 |+Q2-NPN-B-ScrollLock_LED(Hi:On) |LED_SCRL |PB6
* 5V intferface
+ 3.3V interface
Switch 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 |
More
Row designationLV138A(Z1) on switch board selects one of 8 row lines and gives strobe by enabling with ~G2A(17).
|ROW |bit0|bit1|bit2|
|----|----|----|----|
|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 designationLV4051A(Z4, Z5) on switch board select one of 16 column lines to sense capacitance of switches.
|COL |bit0|bit1|bit2|bit3|
|----|----|----|----|----|
|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 |
FirmwareJust `make` to build firmware. And consult with wiki for further information.
-
https://github.com/tmk/tmk_keyboard/tree/master/keyboard/fc980c-
https://github.com/tmk/tmk_keyboard/wiki#build-firmwareAlso Keymap Editor is available.
-
http://www.tmk-kbd.com/tmk_keyboard/editor/unimap/?fc980cOriginal hardware
In this pic origial controller is located on the right and USB connector PCB on the left.
Switch board.
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- JST S5B-PH-SM4:
http://www.jst-mfg.com/product/pdf/eng/ePH.pdf- Hirose UX60SC-MB-5S8:
https://www.hirose.com/product/en/products/UX/UX60SC-MB-5S8%2880%29/- TYU TU1252WNR-05S:
http://php2.twinner.com.tw/files/tyu/TU1252series.pdf- Tr(E42) for LED?:
http://cj-elec.com/txUpfile/2013614923661845.pdf3.3V power supplyLV07A 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 AD5258Controller 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.
USB connector boardThe keyboard has USB receptacle on small separate 1.0mm-thick PCB. USB receptacle is Hirose UX60SC-MB-5S8 while wire-to-PCB connector is TYU TU1252WNR-05S.
http://i.imgur.com/Nucn6h9h.jpgResources- Pics:
http://imgur.com/a/HhyIq
