LPBB(4) 						   BSD 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.

BSD
								 October 25, 1998							       BSD