| Author | Message | | | eric | | Posted: Fri Sep 01, 2006 12:40 pm Post subject: Tiny analogue switch alleviates I2C address conflicts | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | A Maxim application
To avoid address conflicts, every peripheral on an I2C™ bus must
have a unique address. Sometimes, however, peripherals may be
assigned the same address. The circuit shown resolves address conflicts
by enabling the I2C bus to select between two peripherals
with the same address.
The popular I2C bus is an open-collector, 2-wire interface that
includes a clock line and a bidirectional data line. It allows a controller
(the master) to select a particular device (the slave) by first
issuing a serial address on the data line, then issuing appropriate
commands or data. Master and slave can send data in both directions
by pulling the data line low, and slaves can generate wait
states by pulling the clock line low. Bus switching is complicated,
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