Theoretically, up to 256 devices can be connected to a single 1-Wire bus, but in practice, the maximum number is limited by the bus capacitance, wire length, and noise tolerance. A good rule of thumb is to limit the number of devices to 10-20 per bus.
To ensure reliable communication, use a twisted pair or shielded cable, keep the bus voltage between 3.0V and 5.5V, and use a strong pull-up resistor (e.g., 1kΩ) on the 1-Wire bus. Additionally, consider using a 1-Wire repeater or buffer to amplify the signal and reduce noise.
Yes, the DS2436B is compatible with both 3.3V and 5V microcontrollers. However, ensure that the voltage supply to the DS2436B is within its recommended operating range (2.8V to 5.5V) and that the microcontroller's output voltage is within the DS2436B's input voltage range (VCC - 0.5V to VCC + 0.5V).
The DS2436B's POR and BOR circuits ensure that the device resets properly during power-up. To handle these resets, add a small capacitor (e.g., 0.1μF) between the VCC pin and GND to filter out noise and ensure a clean power-up. Additionally, consider adding a reset circuit or using a microcontroller with a built-in POR/BOR to manage the power-up sequence.
To minimize noise and ensure reliable communication, keep the 1-Wire bus traces short and away from high-frequency signals. Use a single-point ground connection, and avoid routing the bus near power planes or high-current paths. Additionally, consider using a dedicated 1-Wire bus layer or a shielded cable to reduce electromagnetic interference (EMI).
DS2436B datasheet
by Maxim Integrated Products
