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LPBB(4)               DragonFly Kernel Interfaces Manual               LPBB(4)

NAME
     lpbb -- parallel port I2C bit-banging interface

SYNOPSIS
     device iicbus
     device iicbb

     device lpbb
     device iic

DESCRIPTION
     The lpbb driver supports the Philips official I2C parallel bit-banging
     interface.

                                              LS05 pin 14 (Vcc) o      -------
                                                                |      |     |
                 +--+--+---------------------+--+--+------------+------+-o 1 |
                 |  |  |                     |  |  |           ===.1uF | +5V |
       -------- [R][R][R] 3x10K       3x10K [R][R][R]   LS05    |      |     |
       |      |  |  |  |                     |  |  |    pin 7 o-+------+-o 2 |
       | 12 o-+--+  |  |   3|\ 4             |  |  |    (Gnd)          | GND |
       | 17 o-+-----|--|----| >o-------------+--|--|--------------+    |     |
       |      |     |  |    |/        8 /|9     |  |     10 /|11  +----+-o 3 |
       | 15 o-+-----+--|--------------o< |------+--|------o< |----+    | SCL |
       |      |        |   1|\ 2        \|         |        \|         |     |
       |  9 o-+--------|----| >o-------------------+--------------+----+-o 4 |
       |      |        |    |/                            6 /|5   |    | SDA |
       | 11 o-+--------+----------------------------------o< |----+    -------
       | 10 o-+-+                                           \|          4-pin
       | 13 o-+-+--oGND                                              Connector
       | 25 o-+-+      ------------------ Part List --------------------------
       --------        | 1 - .1 uF capacitor   | 6 - 10K 5% resistors        |
       25-pin male D   | 1 - 4-pin connector   | 1 - 25-pin male D connector |
       connector to PC | 1 - 74LS05 open collector hex inverter              |
       printer port    -------------------------------------------------------

SEE ALSO
     iicbb(4), iicbus(4), ppbus(4)

HISTORY
     The lpbb manual page first appeared in FreeBSD 3.0.

AUTHORS
     This manual page was written by Nicolas Souchu.

DragonFly 3.5                  October 25, 1998                  DragonFly 3.5