W5100

Overview

The W5100 is a single-chip Ethernet controller integrating a full hardware TCP/IP stack, MAC, and PHY. It supports 10/100 Mbps Ethernet standards (IEEE 802.3 10BASE-T and 802.3u 100BASE-TX) with data rates up to 25 Mbps. The chip provides four independent hardware sockets for simultaneous connections and includes 16 KB of internal memory for data transmission. It operates at 3.3 V DC with 5 V tolerant I/Os and features SPI, direct parallel, and indirect parallel interfaces. Supported protocols include TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE.

Feature Summary

• Integrates a fully wired TCP/IP protocol stack, MAC, and PHY into a single chip to eliminate software overhead.
• Supports four independent hardware sockets for concurrent network connections.
• Offers flexible microcontroller interface options including SPI, direct parallel bus, and indirect parallel bus.
• Includes 16 KB of on-chip memory dedicated to data transmission buffering.

Applications

• Embedded systems requiring Internet connectivity without an operating system.
• Industrial control modules and simple gateways.
• Security monitoring devices.
• Embedded servers.

Procurement Notes

Verify the specific package variant, as the W5100 is available in LQFP-80. Confirm voltage compatibility, noting the 3.3 V core with 5 V tolerant I/Os. Ensure the selected component matches the required interface mode (SPI or parallel) for the target microcontroller design. Check for RoHS compliance status if environmental regulations apply to the final product assembly.

Selection Notes

Select the W5100 for applications prioritizing cost-effectiveness and stability over high throughput. It is suitable for projects with limited MCU resources due to its hardware protocol offloading. Consider the LQFP-80 package size constraints during PCB layout. For higher performance or smaller footprints, evaluate successors like the W5200 or W5500, which offer increased socket counts and reduced package sizes.

Part Context

The W5100 is part of the WIZnet iEthernet series, serving as a foundational model for hard-wired TCP/IP solutions. It succeeded the W3150A+ by integrating the RTL8201CP PHY core. This chip established the company's TOE (TCP/IP Offload Engine) technology approach, enabling microcontrollers to handle application logic while the W5100 manages network communication tasks entirely in hardware.

Replacement Considerations

The W5100S is a pin-compatible successor offering improved performance. For space-constrained designs, the W5200 provides a QFN-48-EP footprint with doubled socket capacity. High-throughput requirements may necessitate the W5300 or W5500, which feature larger buffers and advanced interface capabilities compared to the original W5100 architecture.