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