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[tmk_keyboard.git] / keyboard / hhkb / doc / HHKB.txt
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208f6d7f 1Internal of HHKB pro
2=====================
3HHKB pro has MCU and some chips on separate two PCBs.
99bba8d9 4
208f6d7f 5Controller PCB
6--------------
99bba8d9 7 M38K07M4 Renesas MCU with USB function
8 http://documentation.renesas.com/eng/products/mpumcu/rej03b0192_38k0ds.pdf
c8e1ad8c 9
99bba8d9 10 (HHKB_controller.jpg)
11
208f6d7f 12Keyswitch PCB
13-------------
99bba8d9 14 HC4051 Analog Multiplexer: select a row line.
60134830 15 http://www.ti.com/lit/ds/schs122j/schs122j.pdf
99bba8d9 16 LS145 BCD Decoder: select a column line.
60134830 17 http://www.ti.com/lit/ds/symlink/sn74ls145.pdf
99bba8d9 18 BU9831 Non-volatile electronic potentiometer: for calibration?
60134830 19 https://www.spezial.com/doc/rohm-a/bu9831.pdf
13e4662b 20 TP1683/4 Capacitive Sensing controller: no datasheet available.
c8e1ad8c 21
99bba8d9 22 (HHKB_keyswitch.jpg)
c8e1ad8c 23
99bba8d9 24 Topre original chip?
25 (HHKB_TP1684.jpg)
26
27
208f6d7f 28Connector Cable
29---------------
30Two PCBs are connected by 15 lines(13 in case of Pro2).
60134830 31Vcc and GND use 3(2) lines each, other lines are for keyboard signaling.
99bba8d9 32
60134830 33 HHKB connector lines:
8e7153d1 34 JP Pro2 Pro Function Description TMK pin usage
d2ea9e80 35 --------------------------------------------------------------------------------------------
60134830 36 1 Vcc(5V) 5V
37 1 1 2 Vcc(5V) 5V
38 2 2 3 Vcc(5V) 5V
8e7153d1 39 3 3 4 TP1684 ~KEY: Low(0) when key is pressed PD7 input(with pullup)
40 4 4 5 TP1684 HYS: High(1) when key is pressed PB7 output
60134830 41 5 5 6 HC4051 A(bit0)\ PB0 output
42 6 6 7 HC4051 B(bit1) > select row 0-7 PB1 output
43 7 7 8 HC4051 C(bit2)/ PB2 output
44 8 8 9 LS145 A(bit0)\ PB3 output
45 9 9 10 LS145 B(bit1) > select column 0-7 PB4 output
46 10 10 11 LS145 C(bit2)/ PB5 output
8e7153d1 47 11 11 12 LS145 ~D(enable) Low(0) enables selected column PB6 output
60134830 48 12 12 13 GND GND
49 13 13 14 GND GND
50 15 GND
8e7153d1 51 14 HC4051(Z2) ~Enable of Z2 row0-7 PC6
52 15 HC4051(Z3) ~Enable of Z3 row8-15 PC7
208f6d7f 53
8e7153d1 54 NOTE: Probably HYS changes threshold for upstroke and makes hysteresis in the result.
55 NOTE: HYS should be given High(1) when previous KEY state is Low(0).
d2ea9e80 56 NOTE: 1KOhm didn't work as pullup resistor on KEY. AVR internal pullup or 10KOhm resistor was OK.
60134830 57 NOTE: JP has two HC4051(Z2,Z3) and line 5, 6 and 7 are connected to both of them.
c8e1ad8c 58
99bba8d9 59 (HHKB_connector.jpg)
60
61
62Keyswitch matrix
63----------------
60134830 64HHKB switch matrix is ghost-free and bounce-free.
99bba8d9 65
60134830 66 Pro/Pro2(8x8):
208f6d7f 67 COL 0 1 2 3 4 5 6 7
68 ROW ---------------------------------------------------------------
69 0| 2 q w s a z x c
70 1| 3 4 r e d f v b
71 2| 5 6 y t g h n _NONE_
72 3| 1 Esc Tab Control LShift LAlt LMeta Space
73 4| 7 8 u i k j m _NONE_
74 5| \ ` Delete Return Fn RShift RAlt RMeta
75 6| 9 0 o p ; l , _NONE_
76 7| - + ] [ ' / . _NONE_
99bba8d9 77
78
60134830 79 JP(16x8):
80 COL 0 1 2 3 4 5 6 7
81 ROW ---------------------------------------------------------------
82 0| ESC TAB LFn LShift LCtrl
83 1| 4 E MuHKN C D
84 2| 3 W LAlt X S
85 3| 1 HHK
86 4|
87 5| 5 R V F
88 6| 2 Q LGui Z A
89 7| 6 T Space B G
90 8| 9 I Kana , K
91 9| 8 U Henkan M J
92 A| 7 Y N H
93 B| 0 O RAlt . L
94 C| BS Right RShift Enter
95 D| \ [ Down Up ]
96 E| - P RFn / ;
97 F| ~ @ Left Ro :
98
99
99bba8d9 100Matrix diagram:
208f6d7f 101
60134830 102 Pro/Pro2:
99bba8d9 103 +-------------------------+-+-+-+-+-+-+-+ Vcc
104 |bias control? - - - - - - - - ---
105 | 3.9K*8 R R R R R R R R |
106 +--------^+ +--------+ - - - - - - - - |
e109b550 107 | 3| | HC4051 <0-------|-|-|-|-|-|-|-|--|R|-+
108 | DIL-20 |capa. | <1-------|-|-|-|-|-|-|-|--|R|-+
13e4662b 109 | TP1684 |sense | <2-------|-|-|-|-|-|-|-|--|R|-+
e109b550 110 | 20<------| <3-------|-|-|-|-|-|-|-|--|R|-+
99bba8d9 111 | | | <4-------|-|-|-|-|-|-|-|--|R|-+
112 | | | <5-------|-|-|-|-|-|-|-|--|R|-+
e109b550 113 >5~EN <-+ | <6-------|-|-|-|-|-|-|-|--|R|-+
114 | 2 4 | | | <7-------|-|-|-|-|-|-|-|--|R|-+
13e4662b 115 +---V---^-+ | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8
8e7153d1 116 KEY HYS | A B C +-----------------+
99bba8d9 117 | | +-^----+ | | | | LS145 |
118 Vcc | | |BU9831| | | | +-^--^--^--^------+
60134830 119 --- | | +------+ | | | A B C D +-------+
120 | | | | | | | | | | | |
121 1-3 4 5 6 7 8 9 10 11 12 13-15 Pro |
122 1-2 3 4 5 6 7 8 9 10 11 12-13 Pro2|
123 +--------------------------------------------------+ |
124 | connector | ---
125 +--------------------------------------------------+ GND
126
127
128 JP:
129 +-----------------------------+-+-+-+-+ Vcc
130 |bias control? - - - - - ---
131 | 3.9K*5 R R R R R |
132 +--------^+ +--------+ - - - - - |
e109b550 133 | 3| | HC4051 <0-----------|-|-|-|-|----|R|-+
60134830 134 | |capa. | Z2 <1-----------|-|-|-|-|----|R|-+
135 | TP1684 |sense | <2-----------|-|-|-|-|----|R|-+
e109b550 136 | 20<---+--| <3-----------|-|-|-|-|----|R|-+
60134830 137 | | | | <4-----------|-|-|-|-|----|R|-+
138 | | ~En| <5-----------|-|-|-|-|----|R|-+
e109b550 139 >5~EN | +----> <6-----------|-|-|-|-|----|R|-+
140 | 2 4 | | | | A B C <7-----------|-|-|-|-|----|R|-+
60134830 141 +---V---^-+ | | +-^-^-^--+ | | | | | |
8e7153d1 142 KEY HYS | | | | | | | | | | |
60134830 143 | | | | +--------+ | | | | | |
144 | | | | | HC4051 <8-----------|-|-|-|-|----|R|-+
145 | | | | | Z3 <9-----------|-|-|-|-|----|R|-+
146 | | | +--| <A-----------|-|-|-|-|----|R|-+
147 | | | | <B-----------|-|-|-|-|----|R|-+
148 | | | | <C-----------|-|-|-|-|----|R|-+
149 | | | ~En| <D-----------|-|-|-|-|----|R|-+
150 | | | +-> <E-----------|-|-|-|-|----|R|-+
151 | | | | | A B C <F-----------|-|-|-|-|----|R|-+
152 | | | | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8
153 | | | | | | | +-----------------+
154 | | | | | | | | LS145 |
155 Vcc | | | | | | | +-^--^--^--^------+
156 --- | | | | | | | A B C D +-------+
157 | | | | | | | | | | | | | |
158 1-2 3 4 14 15 5 6 7 8 9 10 11 12-13 |
159 +--------------------------------------------------+ |
160 | connector | ---
161 +--------------------------------------------------+ GND
e109b550 162
163TP1684-5(~EN) pin is connected with LS145-D/Connector-11.
99bba8d9 164
165
208f6d7f 166Signals charts
167--------------
92004d67 168 While pressing space bar, watched HHKB Pro original controller signals by logic analyzer.
99bba8d9 169 Row and column is looping between 0-7 each for selecting a key.
170 A key is scaned every about 15ms, so scan rate is 66Hz.
c8e1ad8c 171
99bba8d9 172 (HHKB_chart1.jpg)
173
2ca3ab18 174 Space bar locate at ROW:3 COL:7. A key is selected by HC4051(C,B,A) and LS145(C,B,A).
e109b550 175 Key state can be read on TP1684(4) while asserting low on LS145(D).
2ca3ab18 176
99bba8d9 177 (HHKB_chart2.jpg)
178
99bba8d9 179
92004d67 180 Signal of JP:
99bba8d9 181
92004d67 182 1) Select row
183 rowC ____~~~~____~~~~ 3.8/3.8ms(JP) 7.7/7.7ms(Pro) S2 of HC4051
184 rowB __~~__~~__~~__~~ 1.9/1.9ms(JP) 3.8/3.8ms(Pro) S1 of HC4051
185 rowA _~_~_~_~_~_~_~_~ 1.0/1.0ms(JP) 1.9/1.9ms(Pro) S0 of HC4051
186 0123456701234567 selected row(Pro)
187 0123456789ABCDEF selected row(JP)
188 rowEn0 ________~~~~~~~~ 7.7/7.7ms(JP only) ~Enable of Z2 HC4051(JP only)
189 rowEn1 ~~~~~~~~________ 7.7/7.7ms(JP only) ~Enable of Z3 HC4051(JP only)
99bba8d9 190
92004d67 191 2) Select column
192 colC ____~~~~____~~~~ 550/410us(JP) / us(Pro)
193 colB __~~__~~__~~__~~ 200/210us(JP) 450/460us(Pro)
194 colA _~_~_~_~_~_~_~_~ 100/110us(JP) 220/230us(Pro)
195 0123456701234567 selected column
6c3b9a2d 196
92004d67 197 3) Wait 5us after column select, then set prev, strobe colD to spit out key status and read it.
8e7153d1 198 hys _~~~~_____ 20us if previous key state is low
92004d67 199 colD ~~~__~~~~~ 10us strobe
200 key ~~~____~~~ 22us indicates current state of the key
6c3b9a2d 201
92004d67 202 NOTE: JP scans twice fast as Pro/Pro2 does. So Pro/Pro2 scans 8x8 matrix in 15.4ms while JP scans 16x8 in that time.
99bba8d9 203
204
99bba8d9 205
206EOF
custom keymap for my minivan; forked from http://github.com/evangs/tmk_keyboard
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