Up to 256 devices can be connected to a single 1-Wire bus, but the maximum number of devices that can be practically connected depends on the bus capacitance, wire length, and noise environment.
To ensure reliable communication over long distances, use a twisted pair or shielded cable, keep the bus capacitance low, and use a 1-Wire bus repeater or buffer if necessary.
The VPP pin is used to program the EPROM memory of the DS2431+. It should be connected to a programming voltage (VPP) of 12V to 15V during programming, and to VCC or left floating during normal operation.
To prevent data corruption, ensure that the power supply to the DS2431+ is stable and monotonic during power-up and power-down. Avoid sudden power interruptions or voltage drops.
Yes, the DS2431+ can be used in a multi-drop configuration, where multiple devices are connected to a single 1-Wire bus. Each device must have a unique ROM code to ensure proper addressing.
DS2431+ datasheet
by Maxim Integrated Products
