MicroLAN coupler is an essential component to build and control 1-Wire MicroLAN networks with multi-level branching. In contrast to approaches that switch the ground line, the coupler maintains a common ground level for the whole network and keeps the inactive segments powered. This simplifies supplying central or local power for added devices.
The DS2409 coupler provides a means to create large MicroLAN networks with a common ground and multi‑level branching. It includes an open‑drain N‑channel MOSFET that can be switched via the 1‑Wire bus, an auxiliary output for labeling branches or as a digital input, and a programmable control output for signaling or handshaking.
The device contains a unique 64‑bit laser‑etched ROM code for absolute identification and supports a range of command functions such as Smart‑On, Direct‑On, All Lines Off, and Discharge Lines. Detailed DC and AC electrical characteristics, absolute maximum ratings, and pin assignments are provided for designers.
| Operating Temperature Range | -40°C to +85°C |
|---|---|
| Voltage on Data to Ground | -0.5V to +7.0V |
| Logic 1 (1‑Wire In) Voltage Minimum | 2.2 V |
| Output Sink Current @ 0.4 V (Main Out) | 10 mA |
It creates large common‑ground MicroLAN networks, provides control and auxiliary outputs, and simplifies topology analysis by decoupling devices on active segments.
The device operates from –40 °C to +85 °C.