What Is the W5200 Controller?

What Is W5200?
1. The W5200 is a hardwired TCP/IP Ethernet controller designed to simplify internet connectivity for embedded systems via SPI.
2. The chip includes a fully hardwired TCP/IP stack supporting protocols like TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE.
3. W5200 integrates a 32KB internal buffer for data communication, enabling users to develop Ethernet applications using simple socket programming.
4. Its SPI interface supports communication speeds of up to 80MHz.
5. The W5200 features power-saving modes like Wake on LAN (WOL) and power-down mode. WOL is activated by receiving a magic packet (Raw Ethernet packet).
Pin Assignment of W5200
MCU Interface Signals:
- nRST: Reset (Active LOW). Hold low for ≥2μs, wait ≥150ms after high.
- nSCS: SPI Slave Select (Active LOW). Used in SPI interface.
- nINT: Interrupt (Active LOW). Signals MCU attention to events like connection/disconnection, WOL.
- SCLK: SPI Clock. SPI clock signal pin.
- MOSI: SPI Master Out Slave In. SPI data output from MCU.
- MISO: SPI Master In Slave Out. SPI data input to MCU.
- PWDN: Power Down (Active HIGH). High for power-down mode.
PHY Signals:
- RXIP/RXIN: Differential receive signal.
- TXOP/TXON: Differential transmit signal.
- BIAS: Connect 28.7kΩ ±1% resistor to ground.
- ANE: Auto-Negotiation Mode. High = Enable.
- DUP: Duplex Mode. High = Full, Low = Half (during reset only).
- SPD: Speed Mode. High = 100M, Low = 10M (during reset only).
Miscellaneous Signals:
- nFDXLED/M2, nSPDLED/M1, nLINKLED/M0: Mode Select. Normal = 111.
- M3: I/F Enable. Pull-up required.
- RSV: Reserved. Pull-down or GND.
Power and Ground:
- VCC3V3A/VCC3V3: 3.3V analog/digital power.
- VCC1V8: 1.8V digital power for the core.
- GNDA/GND: Analog/Digital ground.
- 1V8O: Internal 1.8V regulator. Use tantalum capacitor for stability; avoid powering other devices.
- XTALVDD: Connect 10.1μF capacitor to ground.
Circuit Principle of W5200
The W5200 circuit operates based on a hardware-implemented TCP/IP stack and integrated Ethernet MAC and PHY modules. Incoming network signals are received through the RXIP/RXIN pins, where the Ethernet PHY and MAC handle signal decoding and network protocol processing, such as ARP and IP packet parsing. Decoded data is stored in the internal 32KB buffer and processed by the hardware TCP/IP stack, supporting multiple protocols like TCP and UDP, simplifying complex network tasks.
The processed data is then transmitted to the MCU via the SPI interface for fast and reliable communication. On the sending end, encoded data is output through the TXOP/TXON pins to the network. Additionally, the W5200 supports WOL functionality, allowing the system to wake up via magic packets, and features power mode switching to reduce overall power consumption.
Specification of W5200
Ethernet: 10/100 Mbps
Memory: 32KB internal buffer
Interface: SPI
Supply Voltage: 2.97V ~ 3.63V
Power Modes: Wake-on-LAN (WOL), Power-down mode
Supply Current: 160mA
Operating Temperature: -40°C ~ 85°C
Package: 48-QFN
Features of W5200
Support Hardwired TCP/IP Protocols : TCP, UDP, ICMP, IPv4 ARP, IGMP, PPPoE, Ethernet
Supports 8 independent sockets simultaneously
Very small 48 Pin QFN Package
Support Power down mode - Support Wake on LAN
Support High Speed Serial Peripheral Interface(SPI MODE 0, 3)
Internal 32Kbytes Memory for Tx/Rx Buffers - 10BaseT/100BaseTX Ethernet PHY embedded
Support Auto Negotiation (Full and half duplex, 10 and 100-based )
Support Auto MDI/MDIX
Support ADSL connection (with support PPPoE Protocol with PAP/CHAP Authentication mode)
Not support IP Fragmentation
3.3V operation with 5V I/O signal tolerance
Lead-Free Package
Multi-function LED outputs (Full/Half duplex, Link, Speed)
Applications of W5200
Home Network Devices: Set-Top Boxes, PVRs, Digital Media Adapters
Serial-to-Ethernet: Access Controls, LED displays, Wireless AP relays, etc.
Parallel-to-Ethernet: POS / Mini Printers, Copiers - USB-to-Ethernet: Storage Devices, Network Printers
GPIO-to-Ethernet: Home Network Sensors
Security Systems: DVRs, Network Cameras, Kiosks
Factory and Building Automations
Medical Monitoring Equipments
Embedded Servers
How to Connect W5200?
Connecting the W5200 is straightforward, even for beginners. First, connect the power pins properly: VCC3V3A and VCC3V3 to a 3.3V power source, and VCC1V8, generated internally, ensures stable operation. Ground pins must be connected to the system ground to maintain circuit integrity.
Next, link the W5200 SPI interface to the MCU, including SCLK, MOSI, MISO, and nSCS. Ensure secure connections to avoid signal interference. Finally, connect the Ethernet interface pins RXIP/RXIN and TXOP/TXON to the network jack, and configure relevant PHY pins like SPD and DUP as needed. Once connected, use SPI commands to initialize the W5200 and enable network communication.
Package of W5200
The W5200 is housed in a 48-QFN package, designed with precise dimensional standards. It features a maximum die thickness of 0.0304 mm and adheres to Y14.5M-1994 dimension tolerances. Pin #1 is identified on the package's top surface, using an indentation mark or similar feature. The package allows a maximum warpage of 0.08 mm and ensures terminal measurements exclude the embedded portion of the exposed pad. Corners are rounded with a radius of R0.175 ± 0.025 mm.
FAQs
How is the W5200 initialized?
Through SPI commands sent from the MCU, following the setup of power, ground, and Ethernet connections.
What is the power consumption of the W5200?
Power consumption varies depending on usage but is generally low, especially when using power-saving modes such as Wake on LAN and power-down mode.
Can I directly connect the W5200 to a network without additional components?
Yes, the W5200 includes both the MAC and PHY, so it can be connected directly to a network using a standard Ethernet cable.