SCH3221-7U-TR

Specialized Overview

The SCH3221-7U-TR is a 3.3V (5V tolerant) LPC I/O controller compliant with PC99, PC2001, and ACPI standards. It features four full-function NS16C550A-compatible UARTs supporting up to 460 Kbps, an infrared communications controller for IrDA v1.2, and 33 general-purpose I/O pins. The device includes a watchdog timer, two LED drivers, and extensive programmable wake-up event support via UART Ring Indicators, GPIOs, and the watchdog. It operates in industrial temperature ranges (-40°C to +85°C) and is housed in a 64-ball WFBGA package.

Specialized Feature Summary

• Supports Low Pin Count (LPC) interface with Serial IRQ compatibility
• Integrates four high-speed serial ports with 16-byte FIFOs
• Includes infrared communications controller supporting IrDA v1.2
• Provides extensive programmable wake-up logic from multiple sources

Specialized Applications

• Industrial control systems requiring robust I/O management
• Embedded platforms needing infrared communication capabilities
• Systems utilizing low pin count bus interfaces for host connectivity

Specialized Procurement Notes

Verify the specific suffix '7U' corresponds to the industrial temperature range variant as documented in the official Microchip datasheet DS00002120A. Confirm that the 64-ball WFBGA package footprint matches the design requirements. Ensure all input buffers are properly terminated to prevent floating states during power cycles.

Specialized Selection Notes

Select this component when a 3.3V LPC interface is required alongside multiple serial ports and infrared functionality. Consider the 5V tolerance of non-LPC pins for mixed-voltage system designs. Evaluate the need for trickle power (VTR) support if standby wake-up events are necessary for the application.

Specialized Part Context

The SCH3221 belongs to Microchip's LPC I/O controller family, designed for legacy and embedded system interfacing. It replaces older Super I/O solutions by integrating modern power management features like ACPI compliance and PME support into a compact package suitable for space-constrained industrial and commercial applications.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing firmware and hardware layouts before considering alternative components.