TMC2084-HT

Controllers Overview

The TMC2084-HT is a standalone CircLink controller IC manufactured by Microchip Technology, designed for small control-oriented local area networks. It operates on a low-power CMOS process with a 3.3V power supply and features 5V tolerant I/O. The device supports an enhanced token-passing protocol allowing up to 15 nodes per network. It includes memory mirroring, Network Standard Time (NST) synchronization, and CMI coding with intelligent error correction. The chip provides up to 14 intelligent remote I/O ports, configurable as inputs or outputs, and supports flexible transceiver interfaces including RS-485 and fiber optics. It is housed in a 48-pin TQFP package.

Controllers Feature Summary

• Supports standalone mode operation without requiring a dedicated MCU at each node, reducing system cost and complexity.
• Implements enhanced ARCNET-based token passing protocol with memory mirroring for reliable data communication.
• Features programmable I/O ports with selectable push-pull or open-drain output types and anti-chatter circuits.
• Includes Network Standard Time (NST) for automatic time stamping and clock synchronization across the network.

Controllers Applications

• Industrial automation systems requiring deterministic real-time performance.
• Distributed control environments utilizing multiple remote I/O nodes.
• Networks requiring transformer-coupled RS-485 communication links.
• Applications needing synchronized timing and status monitoring via flag outputs.

Controllers Procurement Notes

Verify that the ordering suffix HT corresponds to the lead-free RoHS compliant package variant. Confirm the package type is the 48-pin TQFP with a 7x7mm body size and 0.5mm pitch. Ensure the operating temperature range meets the requirement of 0 to 70 degrees Celsius for the specific application environment.

Controllers Selection Notes

Select this component when a single processor needs to manage multiple remote I/O controllers efficiently. It is suitable for designs where predictable network access times are critical. Consider the maximum of 15 nodes per network limit. Evaluate the need for standalone I/O functionality versus host controller requirements which may necessitate a TMC2074.

Controllers Part Context

The TMC2084-HT belongs to the CircLink family of networking controllers developed by SMSC, now part of Microchip Technology. These devices utilize an enhanced token-passing protocol derived from ARCNET. The TMC2084 specifically serves as the intelligent remote I/O controller within this architecture, complementing host controllers like the TMC2074.

Controllers Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.