SCH3226I-SY

Application Specific Microcontrollers Overview

The Microchip Technology SCH3226I-SY is a 3.3V Super I/O controller compliant with PC99, PC2001, and ACPI 2.0 standards. It features an LPC interface supporting bus frequencies of 19MHz to 33MHz. The device integrates two full-function serial ports (NS16C550A compatible UARTs) and two additional 4-pin serial ports configurable via strapping. Key hardware monitoring capabilities include remote thermal diode sensing for two external temperatures with ±1.5°C accuracy, internal ambient temperature measurement, and programmable automatic fan control. It includes a watchdog timer, power button control, AC power failure recovery, and up to 40 general-purpose I/O pins.

Application Specific Microcontrollers Feature Summary

• LPC Interface: Supports 19MHz to 33MHz bus frequencies with ISA Plug-and-Play compatibility.
• Hardware Monitoring: Monitors +2.5V, +5V, +12V, Vccp, VCC, Vbat, and Vtr; supports two external thermal diodes and internal sensor.
• Serial Ports: Two full-function UARTs with 16-byte FIFOs and two additional 4-pin serial ports available by strap option.
• Power Management: Includes power button control, AC power failure recovery, and wake-up event support.

Application Specific Microcontrollers Applications

• Industrial computer systems requiring robust environmental monitoring.
• Embedded controllers in PC motherboards and industrial PCs.
• Systems utilizing Low Pin Count (LPC) bus architecture.
• Applications requiring integrated keyboard/mouse controller functionality.

Application Specific Microcontrollers Procurement Notes

Verify the suffix 'I' indicates the Industrial temperature range (-40°C to +85°C). Confirm the 'SY' package designation corresponds to the 100-ball WFBGA format specified for the SCH3226 family. Ensure design compliance with the STRAPOPT pin configuration if legacy feature selection is required.

Application Specific Microcontrollers Selection Notes

Select the SCH3226 variant over the SCH3227 or SCH3224 based on the specific requirement for two full-function serial ports versus four. Verify that the 100-ball WFBGA package fits the board layout constraints. Check if the strap-selectable IDE/PCI reset outputs are needed, as this affects the Device ID register value.

Application Specific Microcontrollers Part Context

The SCH3226 is part of the SCH322x family, succeeding the SCH311x series. It shares architectural similarities but differs in pin count and package options. The SCH3226 specifically offers a balance between the high-feature SCH3227 (144-ball) and the reduced-feature SCH3224/SCH3222 models.

Application Specific Microcontrollers Replacement Considerations

The SCH3116 is a legacy predecessor within the same functional scope. Note that the SCH3226 may report the SCH3116 Device ID depending on the STRAPOPT pin configuration.