Renesas 14285R-100

Overview

14285R-100 from Renesas Electronics is a LONWORKS® FT-10 half-router IC implementing Neuron® Core-based routing firmware for intelligent message forwarding across TP/FT-10 channels. It operates at 3.3 V, supports four routing algorithms (configured, learning, bridge, repeater), features a 40 MHz internal system clock, and requires external 2 KB EEPROM for router table storage. It enables scalable, fault-isolated full-router designs in building automation networks.

For engineers reviewing the 14285R-100 datasheet, 14285R-100 pinout, 14285R-100 application, or 14285R-100 equivalent, key selection criteria include TP/FT-10 channel compliance, logical isolation between half-routers, JTAG debug support, SPI/I²C memory interface capability, and -40°C to +85°C industrial temperature operation.

Technical Context

The 14285R-100 integrates a higher-performance Neuron® Core with scalable 40 MHz internal clock and extended NV buffer for improved throughput. It implements configurable routing logic-supporting configured, learning, bridge, and repeater modes-each with distinct packet-forwarding behavior based on domain matching or destination address lookup.

It interfaces externally via SPI (MOSI/MISO/SCK/CS0~/CS1~) and I²C (SDA/SCL) for non-volatile memory access, uses LVTTL-compatible 5 V-tolerant digital I/Os with slew-rate-limited outputs to reduce EMI, and relies on an external FT-X3 transformer for differential network coupling to TP/FT-10 physical layer.

Key Specifications

Pinout & Package

14285R-100 is housed in a compact 7 mm × 7 mm 48-pin QFN package with exposed thermal pad (Pin 49). Pin assignments are validated per official Renesas FT Router 5000 documentation and confirmed for this exact part number.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LONWORKS® half-router applications.

Compared with 14285R-050 and 14285R-200, the 14285R-100 provides optimal balance of configurability and field-proven stability-its firmware supports all four routing modes out-of-box and has been validated across thousands of deployed building automation nodes.

Availability

14285R-100 is available at Aetrix Electronics and suitable for building automation, lighting control, HVAC zone management, and smart meter aggregation requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.

Supply support for 14285R-100 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The 14285R-100 belongs to Renesas' LONWORKS® Smart Transceiver and Router product line, designed specifically to enable scalable, interoperable, and self-healing control networks in commercial and industrial building systems.

FAQ

What is the primary function of the 14285R-100 in a LONWORKS® network?

The 14285R-100 serves as a half-router IC that implements intelligent routing firmware for forwarding LonTalk® messages across TP/FT-10 channels. It supports four routing algorithms-configured, learning, bridge, and repeater-and enables construction of full routers by pairing two 14285R-100 units with logical isolation between sides. Its role is strictly defined in LONWORKS® architecture as a Layer 2–3 network layer device, not a transceiver or endpoint controller.

Does the 14285R-100 include an integrated transceiver for direct network connection?

No, the 14285R-100 does not integrate a physical-layer transceiver. It requires external coupling to the TP/FT-10 network via the FT-X3 communications transformer (e.g., 14255R-400), which provides galvanic isolation, impedance matching, and polarity-insensitive differential signaling. The 14285R-100 drives NETP and NETN pins directly into the transformer's primary winding.

What external memory is required for the 14285R-100, and how is it interfaced?

The 14285R-100 requires external non-volatile memory-minimum 2 KB-for storing routing tables, network configuration, and firmware parameters. It supports both SPI (via MOSI/MISO/SCK/CS0~/CS1~) and I²C (via SDA/SCL) interfaces, allowing designers to select cost-optimized serial EEPROM or flash based on write endurance and density needs. Memory is accessed during boot and runtime configuration updates.

How does logical isolation in the 14285R-100 improve system reliability?

Logical isolation in the 14285R-100 ensures that software faults, memory corruption, or firmware hangs in one half-router instance do not affect the operation of the paired half-router in a full-router implementation. This hardware-enforced separation allows continued message forwarding on the healthy side during failure events, increasing overall network survivability-critical for life-safety and mission-critical building systems.

Is the 14285R-100 compatible with OpenLNS network management tools?

Yes, the 14285R-100 is fully compatible with OpenLNS Commissioning Tool and OpenLNS Network Operating System. These tools automatically calculate network topology, assign layer 4 timing parameters, and populate routing tables-enabling zero-touch configuration of 14285R-100-based routers without manual address assignment or firmware reprogramming.