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@ -68,7 +68,7 @@ Keyswitch PCB:
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http://www.alldatasheet.com/datasheet-pdf/pdf/27373/TI/SN74LS145D.html
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http://www.alldatasheet.com/datasheet-pdf/pdf/27373/TI/SN74LS145D.html
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BU9831 Non-volatile electronic potentiometer: for calibration?
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BU9831 Non-volatile electronic potentiometer: for calibration?
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http://www.alldatasheet.com/datasheet-pdf/pdf/36387/ROHM/BU9831.html
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http://www.alldatasheet.com/datasheet-pdf/pdf/36387/ROHM/BU9831.html
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TP1684 Capacitive Sensing controller: no datasheet available.
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TP1683/4 Capacitive Sensing controller: no datasheet available.
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(HHKB_keyswitch.jpg)
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(HHKB_keyswitch.jpg)
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@ -120,16 +120,16 @@ Matrix diagram:
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|bias control? - - - - - - - - ---
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|bias control? - - - - - - - - ---
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| 3.9K*8 R R R R R R R R |
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| 3.9K*8 R R R R R R R R |
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+--------^+ +--------+ - - - - - - - - |
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+--------^+ +--------+ - - - - - - - - |
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| TP 1684 | | HC4051 <0-------|-|-|-|-|-|-|-|--|R|-+
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| 2| | HC4051 <0-------|-|-|-|-|-|-|-|--|R|-+
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| |capa. | <1-------|-|-|-|-|-|-|-|--|R|-+
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| |capa. | <1-------|-|-|-|-|-|-|-|--|R|-+
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| |sense | <2-------|-|-|-|-|-|-|-|--|R|-+
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| TP1684 |sense | <2-------|-|-|-|-|-|-|-|--|R|-+
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| <------| <3-------|-|-|-|-|-|-|-|--|R|-+
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| 11<------| <3-------|-|-|-|-|-|-|-|--|R|-+
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| | | <4-------|-|-|-|-|-|-|-|--|R|-+
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| | | <4-------|-|-|-|-|-|-|-|--|R|-+
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| | | <5-------|-|-|-|-|-|-|-|--|R|-+
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| | | <5-------|-|-|-|-|-|-|-|--|R|-+
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| |calib.| <6-------|-|-|-|-|-|-|-|--|R|-+
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| <-+ | <6-------|-|-|-|-|-|-|-|--|R|-+
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| <-+? | <7-------|-|-|-|-|-|-|-|--|R|-+
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| 1 4 | | | <7-------|-|-|-|-|-|-|-|--|R|-+
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+---V-----+ | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8
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+---V---^-+ | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8
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KEY ??? | A B C +-----------------+
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KEY PREV | A B C +-----------------+
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| | +-^----+ | | | | LS145 |
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| | +-^----+ | | | | LS145 |
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Vcc | | |BU9831| | | | +-^--^--^--^------+
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Vcc | | |BU9831| | | | +-^--^--^--^------+
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--- | | +------+ | | | A B C D +------+
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--- | | +------+ | | | A B C D +------+
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