converter/pana_m8/README

   1 Panasonic VP-0187A
   2 ==================
   3 2017/08/06
   4
   5 It is unknown keyboard from Panasonic with Hirose Cherry M8 and 6P6C connector.
   6
   7 Pictures:
   8 http://imgur.com/a/GAZE7
   9
  10 Hirose Cheery M8 switches:
  11 https://deskthority.net/wiki/Cherry_M8
  12
  13
  14
  15 Scan
  16 ----
  17 The keyboard is comprised of some of 4000 series IC without microcontroller.
  18
  19
  20     RST>-----------+---------------+
  21                    |               |
  22             TC4520 |        TC4520 |
  23             --------- carry ---------
  24     CLK>--->|row    |------>|col    |
  25             |counter|Q3     |counter|
  26             ---------       ---------
  27              Q012            Q012
  28               |||             |||
  29               |||             ABC   TC4028
  30               |||           ---------
  31               |||           |decoder|
  32               |||           ---------
  33               |||            |||||| col[0..7]
  34               ABC TC4512     vvvvvvv   pull down
  35             ---------- <----|+++++++|--100K--+
  36             |data    | <----|+++++++|--100K--+
  37     STATE<--|selector| <----|+++++++|--100K--+
  38             | 7 to 1 | <----|+++++++|--100K--+
  39             ---------- <----|+++++++|--100K--+
  40                 row[0..7]   | 8x8 matrix     |
  41                             |                -
  42               TC4078        |               GND
  43               ------        |
  44     SENSE<----| OR |========+ OR'd row[0..7]
  45               ------
  46
  47 - TC4520BP - Dual Binary Up Counter
  48 - TC4028B  - BCD-to-Decimal Decoder
  49 - TC4512BP - 8-Channel Data Selector
  50 - TC4081BP - Quad 2-Input AND Gate
  51 - TC4071BP - Quad 2-Input OR Gate
  52 - TC4078BP - 8-Input NOR/OR Gate
  53
  54
  55 Matrix
  56 ------
  57         0       1       2       3       4       5       6       7
  58     --------------------------------------------------------------------
  59     0   ESC     1       2       3       4       5       6       7
  60     1   8       9       0       -       ^       BS      INS     DEL
  61     2   TAB     Q       W       E       R       T       Y       U
  62     3   I       O       P       @       [       ]       F2      F1
  63     4   CTRL    A       S       D       F       G       H       J
  64     5   K       L       ;       :       RETURN  UP      F3      F4
  65     6   SHIFT   Z       X       C       V       B       N       M
  66     7   SPACE   ,       .       /       LEFT    RIGHT   DOWN    HOME
  67
  68
  69
  70 6P6C connector pinout
  71 ---------------------
  72 1. VCC
  73 2. Clock     - sends clock to binary counter TC4520
  74 3. Key State - indicates hi if key selected by counter is active
  75 4. Sense     - indicates lo if any key is active while Reset is hi.
  76 5. Reset     - resets counter and drives all column
  77 6. GND
  78
  79       123456
  80     ,--------.
  81     | |||||| |
  82     |        |
  83     `--____--'
  84        plug
  85
  86
  87 Ping configuration
  88 ------------------
  89 AVR ATmega32u4 is used as protocol converter.
  90
  91     PD0: Clock. Counter couts up at falling edge.
  92     PD1: Key State. Hi if selected key is activated.
  93     PD2: Sense. Lo if any key is activated while Reset is Hi.
  94     PD3: Reset. Resets counters at riging edge.