|
|
|
@ -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 +------+
|
|
|
|
|