owfs Development Site

i2c DS2482-800

Notes: The DS2482-800 is an elaboration of the DS2482-100 chip.

Both chips are i²c slaves, and 1-wire masters.

i²c is a chip-to-chip protocol developed by Phillips
- A subset of the protocol, SMBUS is used extensively in modern PCs, for configuration of memory, audio, sensors, etc... See lm-sensors.
- The Linux kernel has drivers for many i2c masters
- The i²c master can be opened as a device: /dev/i2c-n where n in an integer.
- Extensive information is available.
A list of available i²c masters can be seen in /sys/class/i2c-adapter/
- /dev/i2c-0 should be used on the command line (analogous to /dev/ttyS0 for serial)
- The address of the DS2482 on that i²c bus will be auto-probed. This might cause problems with other i²c slaves on that bus.
- More sophisticated address can be specified.

Eight 1-wire data/power pin outputs
Eight separate 1-wire busses (called channels in the datasheet)
- Share a common ground
- Share same datapath within the chip
Separately addressable within OWFS
- Appear as 8 adapters
- Default shows the union of the channel contents.
- Special logic negotiates channel contention.

Note: Much of the motivation and testing of the DS2482 support are due to Jan Kandziora and Daniel Höper.

Datasheet: DS2482-800

Description: 8 channel i2c bus master

Name: DS2482-800 8-channel i2c->1wire adapter

Support: Full

Vendor: Dallas Maxim