SCH3226I-SY-TR

Application Specific Microcontrollers Overview

The Microchip Technology SCH3226I-SY-TR is a Super I/O controller operating at 3.3V with a 5V-tolerant SIO block. It features an LPC interface supporting 19MHz to 33MHz bus frequencies and includes a hardware monitor for voltage, temperature, and fan speed control. The device integrates four full-function serial ports (NS16C550A compatible) and two additional 4-pin serial ports configurable via strapping. It provides up to 40 general-purpose I/O pins, an 8042 software-compatible keyboard controller, and supports ACPI 2.0 power management standards.

Application Specific Microcontrollers Feature Summary

• LPC Interface: Supports bus frequencies of 19MHz to 33MHz with ISA Plug-and-Play compatibility.
• Hardware Monitor: Monitors +2.5V, +5V, +12V, Vccp, VCC, Vbat, and Vtr; includes remote thermal diode sensing and programmable PWM fan control.
• Serial Ports: Includes four full-function UARTs with 16-byte FIFOs supporting baud rates up to 1.5 Mbps, plus two strap-configurable 4-pin serial ports.
• Keyboard Controller: Features an 8042 software-compatible controller with dedicated open-drain outputs for keyboard/mouse interfaces.

Application Specific Microcontrollers Applications

• Motherboard glue logic and system management
• Industrial PC embedded controllers
• Hardware monitoring and thermal management systems

Application Specific Microcontrollers Procurement Notes

Verify the suffix 'I' indicates the industrial temperature range (-40°C to +85°C). Confirm the 'SY-TR' designation corresponds to the WFBGA-100 package and tape-and-reel shipping format as specified in the product identification section of the datasheet.

Application Specific Microcontrollers Selection Notes

Select this component when an LPC-based Super I/O solution is required with integrated hardware monitoring and multiple serial ports. Ensure the design utilizes the STRAPOPT pin configuration correctly, as it determines specific pin functions and the Device ID register value (0x7F or 0x7D). Do not activate logical devices or GPIOs not listed for the SCH3226 variant.

Application Specific Microcontrollers Part Context

The SCH3226 is part of the SCH322x family, which succeeds the SCH311x series. It shares architectural similarities but differs in pin count and available features. Unlike the SCH3227, the SCH3226 does not include a parallel port but offers similar hardware monitoring and serial port capabilities within a 100-ball WFBGA package.

Application Specific Microcontrollers Replacement Considerations

The SCH3116 is the legacy predecessor. While functionally similar, the SCH3226 requires proper handling of the STRAPOPT pin to emulate SCH3116 behavior if needed. No direct cross-model substitutes are confirmed in the provided documentation.