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.\" Copyright (c) 1998, Nicolas Souchu
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.\" $FreeBSD: release/9.1.0/share/man/man4/lpbb.4 213573 2010-10-08 12:40:16Z uqs $
.\"
.Dd October 25, 1998
.Dt LPBB 4
.Os
.Sh NAME
.Nm lpbb
.Nd parallel port I2C bit-banging interface
.Sh SYNOPSIS
.Cd "device iicbus"
.Cd "device iicbb"
.Pp
.Cd "device lpbb"
.Cd "device iic"
.Sh DESCRIPTION
The
.Em lpbb
driver supports the Philips official I2C parallel bit-banging interface.
.Bd -literal
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 -------------------------------------------------------
.Ed
.Sh SEE ALSO
.Xr iicbb 4 ,
.Xr iicbus 4 ,
.Xr ppbus 4
.Sh HISTORY
The
.Nm
manual page first appeared in
.Fx 3.0 .
.Sh AUTHORS
This
manual page was written by
.An Nicolas Souchu .