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% re

sistors
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