Zeven Development
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1-Wire® Junction
Connect 1-Wire® Sensors to the screw terminal junction.
Feature List
- Easy to connect 1-Wire® sensors to your IO Expander 1-Wire® bus using screw terminals.
- Connect as many 1-Wire® junctions as you want.
- 100Ω inline resistor drop for distributed impedance matching.
- Supports up to two 1-Wire® buses D1 and D2.
- 37.2mm x 23.3mm
In order to connect as many 1-Wire® sensors on to a single wire the sensor is connected to the 1-Wire® bus as a stub, but there is an impedance mismatch at the branch point. Reflections from the end of the stub return to the main trunk, delayed only by the time it takes for the signal to travel the length of the stub. These reflections can then cause problems for the other slaves on the network. A resistor in series with the stub will reduce the severity of the mismatch and the amplitude of the reflected energy. The resistor mitigates adverse effects from stub-generated reflections on the main trunk
Guidelines for Reliable Long Line 1-Wire® Networks
| Pin | Function |
|---|---|
| 1 | NC |
| 2 | 5V |
| 3 | D1 |
| 4 | Gnd |
| 5 | D2 |
| 6 | NC |
The following 1-Wire® devices are supported by the IO Expander.
| Sensor Type |
|---|
| DS18B20 Temperature |
| DS18S20 Temperature |
| DS1822 Temperature |
| DS28E17 1-Wire® to I2C |
1-Wire is a registered trademark of Maxim Integrated Products, Inc.