SCH3223-7U

Application Specific Microcontrollers Overview

The SCH3223 is a 3.3V Super I/O controller compliant with PC99, PC2001, and ACPI 2.0 standards. It features an LPC bus interface supporting frequencies from 19MHz to 33MHz and includes two high-speed NS16C550A compatible UARTs capable of baud rates up to 1.5 Mbps. The device integrates hardware monitoring for voltages (+2.5V, +5V, +12V, Vccp) and temperature, alongside a watchdog timer and power management logic. It operates within an industrial temperature range of -40°C to +85°C and is housed in a 64-ball WFBGA package.

Application Specific Microcontrollers Feature Summary

• LPC Bus Interface: Supports 19MHz to 33MHz operation with ISA Plug-and-Play compatibility.
• Dual Serial Ports: Two full-function UARTs with 16-byte FIFOs and support for up to 1.5 Mbps data rates.
• Hardware Monitoring: Monitors multiple voltage rails and supports remote thermal diode sensing with ±1.5°C accuracy.
• Power Management: Includes programmable wake-up events (PME), System Management Interrupt (SMI), and AC power failure recovery.

Application Specific Microcontrollers Applications

• Industrial PC motherboard designs requiring robust I/O control.
• Embedded systems needing integrated hardware monitoring and fan control.
• Legacy peripheral integration via LPC bus and serial ports.

Application Specific Microcontrollers Procurement Notes

Verify the specific suffix '7U' against the manufacturer's current product status, as distribution listings may indicate end-of-life or discontinuation phases. Confirm that the 64-ball WFBGA footprint matches the PCB design guidelines provided in the datasheet, specifically regarding the sparse 0.5mm pitch routing rules. Ensure compliance with RoHS requirements if applicable to the manufacturing environment.

Application Specific Microcontrollers Selection Notes

Select this component when a system requires a single-chip solution for LPC-based Super I/O functions combined with hardware monitoring. It is suitable for applications needing 5V tolerant I/O blocks while operating on a 3.3V core supply. Consider the availability of the industrial temperature grade (-40°C to +85°C) if the deployment environment exceeds commercial limits. Verify that the required number of GPIOs and serial ports aligns with the device's multiplexed pin capabilities.

Application Specific Microcontrollers Part Context

The SCH3223 belongs to Microchip Technology's line of Multiprotocol Card Interface ICs designed for PC architecture. It serves as a successor to legacy Super I/O controllers by integrating modern LPC connectivity. The device consolidates functions previously handled by multiple discrete chips, including clock generation, reset logic, and serial communication interfaces, into a compact surface-mount package.

Application Specific Microcontrollers Replacement Considerations

The SCH3221I-7U is a related variant offering similar LPC IO functionality but with a 64-ball WFBGA package and different I/O counts. Verify pinout compatibility and register set alignment before substitution, as differences in available General Purpose I/O pins and specific monitor channels may exist between these models.