SCH3223-7U-TR

Application Specific Microcontrollers Overview

The SCH3223-7U-TR is a 3.3V Super I/O controller manufactured by Microchip Technology, housed in a 64-ball WFBGA package. It features an LPC bus interface supporting frequencies from 19MHz to 33MHz and includes two high-speed NS16C550A compatible UARTs with 16-byte FIFOs capable of baud rates up to 1.5 Mbps. The device integrates hardware monitoring for voltage, temperature, and fan control, alongside a watchdog timer, programmable clock output, and security key register. It supports ACPI 2.0 compliance and provides multiple reset generation options.

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 NS16C550A compatible UARTs with 16-byte FIFOs and speeds up to 1.5 Mbps.
• Hardware Monitoring: Monitors +2.5V, +5V, +12V, Vccp, VCC, Vbat, and Vtr supplies; includes remote thermal diode sensing accurate to 1.5°C.
• Power Management: Includes PME interface, SMI support, power button control, AC power failure recovery, and watchdog timer.

Application Specific Microcontrollers Applications

• Desktop and server motherboard system controllers
• Industrial PC embedded systems requiring robust I/O and monitoring
• ACPI compliant power management subsystems

Application Specific Microcontrollers Procurement Notes

Verify the -7U suffix indicates the industrial temperature range (-40°C to +85°C) and the -TR suffix denotes tape and reel packaging. Confirm RoHS compliance status as specified in the datasheet. Ensure the ordering part number matches the specific package variant required for the PCB footprint.

Application Specific Microcontrollers Selection Notes

Select this component for designs requiring an LPC interface with integrated hardware monitoring and dual serial ports. Ensure the design accommodates the 64-ball WFBGA package with 0.5mm pitch. Verify that the 3.3V supply rails meet the nominal voltage requirements for VCC, VTR, and HVTR planes.

Application Specific Microcontrollers Part Context

The SCH3223 is part of Microchip's Super I/O family designed for PC99/PC2001 compliance. It serves as a central I/O controller integrating legacy interfaces like UART and parallel port logic with modern LPC connectivity. The device replaces discrete Super I/O chips by consolidating monitoring, reset generation, and power control functions into a single IC.

Application Specific Microcontrollers Replacement Considerations

Check for direct pin-compatible alternatives within the Microchip SCH series. Verify if newer revisions of the datasheet (e.g., DS00002028B) indicate any silicon errata or recommended layout changes compared to previous versions.

Application Specific Microcontrollers FAQ

What is the maximum baud rate supported by the serial ports?

The SCH3223 supports baud rates up to 1.5 Mbps on its two NS16C550A compatible UARTs.

How does the device handle wake-up events when VCC is removed?

The device uses the VTR trickle supply to maintain PME wakeup functionality. Specific GPIOs and serial port inputs remain active under VTR power to detect wake-up events even when the main VCC rail is off.

Is the SIO block 5V tolerant?

Yes, while the SCH3223 operates at 3.3V, the SIO block pins are 5V tolerant.