Author Topic: FC980C Alt Controller  (Read 6766 times)

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Offline hasu

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FC980C Alt Controller
« on: Thu, 20 July 2017, 20:21:49 »
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=88439.0


Hardware                                                                                         
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 configuration
Connector bridging between switch board and controller is Hirose DF14A-20P-1.25H.

Quote

    |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

Quote

    |    |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 designation
LV138A(Z1) on switch board selects one of 8 row lines and gives strobe by enabling with ~G2A(17).

Quote

    |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 designation
LV4051A(Z4, Z5) on switch board select one of 16 column lines to sense capacitance of switches.

Quote

    |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   |


Firmware
Just `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-firmware

Also Keymap Editor is available.
- http://www.tmk-kbd.com/tmk_keyboard/editor/unimap/?fc980c


Original 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.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.


USB connector board
The 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.jpg


Resources
- Pics: http://imgur.com/a/HhyIq
« Last Edit: Mon, 04 October 2021, 08:21:55 by hasu »

Offline Atredl

  • Posts: 805
  • Location: SoCal
Re: FC980C Alt Controller
« Reply #1 on: Fri, 21 July 2017, 00:02:02 »
That settles it. I'm getting a FC960c

Offline stoic-lemon

  • Posts: 970
  • Location: Saitama, Japan
Re: FC980C Alt Controller
« Reply #2 on: Fri, 21 July 2017, 01:19:19 »
I love the fact that you're so thorough with documenting your process, too.

Offline hasu

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  • Posts: 3349
  • Location: Tokyo, Japan
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Re: FC980C Alt Controller
« Reply #3 on: Fri, 28 July 2017, 07:51:53 »

Offline hasu

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  • Posts: 3349
  • Location: Tokyo, Japan
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Re: FC980C Alt Controller
« Reply #4 on: Thu, 26 April 2018, 22:07:20 »
Updated firmware.  This change increase scan rate and disables debug print to accept fast key input .
Never got report from users but If you experience drop or transpose keys in fast typing try new firmware.

You can download from keymap editor or build from the latest source code.
http://www.tmk-kbd.com/tmk_keyboard/editor/unimap/?fc980c

EDIT: this commit
https://github.com/tmk/tmk_keyboard/commit/cdf4b51d48f8c9791a2a3fd01b3e089181bf8ac9#diff-8ca61b304e365d1f3fb808b12ea0b5d0
« Last Edit: Thu, 26 April 2018, 22:10:34 by hasu »

Offline hasu

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  • Location: Tokyo, Japan
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Re: FC980C Alt Controller
« Reply #5 on: Mon, 14 October 2019, 19:01:59 »
Updated firmware for initial state of LED indicators.

See this post.
https://geekhack.org/index.php?topic=90104.msg2821680#msg2821680