SCH3221I-7U

Specialized Overview

The SCH3221I-7U is a 3.3V (5V tolerant) PC99/PC2001 compliant I/O controller with an LPC interface, manufactured by Microchip Technology. It features four full-function NS16C550A compatible UARTs supporting data rates up to 460 Kbps, 33 general-purpose I/O pins, and IrDA v1.2 infrared communication capabilities. The device operates within an industrial temperature range of -40°C to +85°C and is housed in a 64-ball WFBGA package.

Specialized Feature Summary

• Supports ACPI compliance and multiple low power-down modes for energy efficiency.
• Includes programmable wake-up event logic triggered by watchdog timers, UART Ring Indicators, or GPIOs.
• Integrates two LED drivers with blinking options and a dedicated watchdog timer.

Specialized Applications

• Industrial control systems requiring robust I/O management
• Embedded devices needing serial port expansion via UARTs
• Infrared communication interfaces in consumer electronics

Specialized Procurement Notes

Verify the component against the official Microchip datasheet DS00002120A to confirm pinout compatibility and electrical specifications. Ensure that the VTR trickle supply configuration matches the system's standby power requirements for proper wake-up functionality.

Specialized Selection Notes

Select this component when a low-pin-count interface is required alongside multiple serial ports and infrared support. Consider the 64-ball WFBGA package constraints and verify that the host processor supports the LPC bus protocol for seamless integration.

Specialized Part Context

This part belongs to the SCH3221 series of Super I/O controllers designed for PC-compatible systems. It serves as a bridge between the LPC bus and various peripheral interfaces, consolidating serial, GPIO, and infrared functions into a single chip to reduce board space.

Specialized Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Verify compatibility with existing firmware and hardware designs before considering alternative components from other manufacturers.

Specialized FAQ

How is the 32.768 kHz clock source configured?

The clock can be sourced externally via the CLKI32 pin or derived internally from the 14MHz clock input. Configuration is managed via the CLK32_PRSN bit in the CR1E register.

What is the purpose of the VTR supply?

VTR provides trickle power to maintain wake-up event functionality and runtime registers when the main VCC supply is removed, enabling the device to detect and respond to power management events.

Are all I/O pins 5V tolerant?

Non-LPC bus pins are 5V tolerant with a maximum input voltage of 5.5V. However, LPC interface pins (LAD, LFRAME#, LDRQ#, LPCPD#) are strictly 3.3V only.