SCH3227I-SZ

Application Specific Microcontrollers Overview

The SCH3227I-SZ is a 3.3V Super I/O controller from Microchip Technology, compliant with PC99 and ACPI 2.0 standards. It features an LPC interface supporting bus frequencies up to 33MHz and includes an integrated 8042 software-compatible keyboard/mouse controller. The device provides four full-function NS16550A-compatible UARTs with 16-byte FIFOs, supporting baud rates up to 1.5 Mbps. Hardware monitoring capabilities include voltage sensing for +2.5V, +5V, +12V, Vccp, VCC, Vbat, and VTR, alongside remote thermal diode inputs. The component utilizes a 144-ball WFBGA package.

Application Specific Microcontrollers Feature Summary

• LPC Interface: Supports bus frequencies of 19MHz to 33MHz with ISA Plug-and-Play compatibility.
• Keyboard Controller: Integrated 8042 software-compatible controller with 2KB program ROM and 256 bytes data RAM.
• Hardware Monitor: Monitors multiple voltages (+2.5V, +5V, +12V, Vccp) and supports two external temperature measurements via thermal diodes.
• Serial Ports: Four full-function UARTs with 16-byte FIFOs and support for RS485 auto direction control.

Application Specific Microcontrollers Applications

• Desktop and server motherboard system management
• Industrial control systems requiring hardware monitoring
• Embedded PC designs utilizing LPC bus architecture

Application Specific Microcontrollers Procurement Notes

Verify the suffix 'I' indicates the Industrial temperature range (-40°C to +85°C). Confirm the 'SZ' suffix corresponds to the specific 144-ball WFBGA package variant. Ensure design compliance with the STRAPOPT pin configuration, as this setting determines the Device ID register value (0x7F or 0x7D) and available pin functions.

Application Specific Microcontrollers Selection Notes

Select the SCH3227 model when parallel port functionality and IDE/PCI reset outputs are required, as these are available via strap options. Compare against the SCH3226 if a smaller 100-ball package is preferred, noting that the SCH3226 shares similar feature sets but lacks the expanded pin count of the SCH3227.

Application Specific Microcontrollers Part Context

The SCH3227 belongs to the SCH322x family, which serves as the successor to the SCH311x series. While functionally similar, the SCH322x family introduces the STRAPOPT pin to allow hard-wired selection between legacy SCH3114 and SCH3116 feature sets. This selection directly impacts the Device ID reported to the system.

Application Specific Microcontrollers Replacement Considerations

The SCH3226 is a compatible alternative within the same family, offering identical core features in a 100-ball WFBGA package. Selection depends on whether the additional GPIOs and strap-selectable IDE/PCI resets of the SCH3227 are necessary for the specific board layout.