SCH3221-7U

Specialized Overview

The Microchip SCH3221-7U is a 3.3V Super I/O controller featuring an LPC interface and four NS16C550A-compatible UARTs supporting up to 460 Kbps. It includes 33 GPIOs, IrDA v1.2 infrared support, and programmable wake-up events via UART RI inputs or GPIOs. The device operates with two power planes (VCC and VTR) for low-power standby functionality and supports ACPI standards.

Specialized Feature Summary

• Four full-function serial ports with 16-byte FIFOs
• Integrated infrared communications controller
• Programmable wake-up logic from multiple sources
• Watchdog timer and dual LED drivers

Specialized Applications

• PC99/PC2001 compliant system designs
• ACPI-compliant embedded platforms
• Industrial control systems requiring serial connectivity

Specialized Procurement Notes

Verify the specific suffix '7U' against official documentation to confirm the commercial temperature range (+70°C to 0°C). Ensure the package type matches the 64-ball WFBGA outline specified in the datasheet. Confirm RoHS compliance status for the specific manufacturing lot.

Specialized Selection Notes

Select this component when an LPC-based Super I/O with quad UARTs is required. Verify that the system design accommodates the 64-ball WFBGA package constraints. Ensure the host processor supports the LPC interface protocol and that the 3.3V power domain aligns with the device specifications.

Specialized Part Context

The SCH3221 belongs to Microchip's LPC I/O family, designed as a drop-in replacement for legacy Super I/O functions in modern low-pin-count architectures. It consolidates serial, GPIO, and infrared functionalities into a single chip, reducing board space compared to discrete solutions.

Specialized Replacement Considerations

Check for direct pin-to-pin replacements within the SCH3xxx series. Verify register compatibility if substituting with other LPC controllers. Ensure the alternative part supports the same LPC signaling voltage levels and ACPI power management states.