App note: Protecting 1-wire 5V slaves from overvoltage
Here is a tutorial from Maxim describing how to protect your 1-wire slave devices from overvoltage.
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If an application requires writing to EPROM devices after deployment, 5V devices need to be protected from overvoltage exposure. This article explains how to have 1-Wire EPROMs and 5V 1-Wire devices on the same bus, if the 5V devices are protected from the programming pulse.