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DS2409P 3.80 €

MicroLAN Coupler

Not Recommended for New Designs

The 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 additional circuitry and prevents loss of status of parasitically powered devices. It also avoids disrupting communication caused by the parasitic power supply of 1-Wire devices after activating a branch. The coupler does not contain any user-programmable memory. To label a branch, one can connect any 1-Wire memory device to the auxiliary 1-Wire output of the coupler. Both the main and the auxiliary 1-Wire output are supported by a "smart-on" command. This command generates a reset/presence sequence on the selected output before the electronic switch closes the contact to the 1-Wire bus. This way the bus master can apply a ROM function command (optionally followed by a memory function) to the devices on the just activated segment with all other devices in the network remaining deselected. This significantly speeds up the analysis of topology and population in a continuously changing network.

The coupler also supports the bus master in detecting arrivals on the inactive segments of the network by responding to the conditional search command. The control output can be used to optically signal the on/off state of a branch or, together with the auxiliary output, for handshaking in dual-master applications.

The network size can be maximized by using a DS2480 line driver at the bus master's serial interface. The DS2480 compensates for the rising ground level caused by the non-zero on-resistance of couplers in multi-level networks.

Features

Low impedance coupler to create large common-ground, multi-level MicroLAN networks
Keeps inactive branches pulled high to 5V
Simplifies network topology analysis by logically decoupling devices on active network segments
Conditional search for fast-event signaling
Auxiliary 1-Wire® line to connect a memory chip or to be used as digital input
Programmable, general-purpose open-drain control output
Communicates at 16.3kbits per second
Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
8-bit family code specifies device communication requirements to bus master
Built-in multidrop controller ensures compatibility with other MicroLAN products
Operating temperature range from -40°C to +85°C
Compact, low-cost 6-pin TSOC surface mount package