SCH3224I-SY-TR

Application Specific Microcontrollers Overview

The SCH3224I-SY-TR 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 of 19MHz to 33MHz. The device integrates two full-function NS16C550A-compatible UARTs with 16-byte FIFOs and two additional 4-pin serial ports. Key functionalities include an 8042 software-compatible keyboard/mouse controller, hardware monitoring with programmable fan control, and a watchdog timer. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 100-ball WFBGA package.

Application Specific Microcontrollers Feature Summary

• LPC Interface: Supports 19MHz to 33MHz bus frequencies for system communication.
• Serial Ports: Includes two full-function UARTs (up to 1.5 Mbps) and two 4-pin serial ports.
• Hardware Monitor: Monitors voltages (+2.5V, +5V, +12V, Vccp) and temperatures with automatic fan control via PWM outputs.
• Keyboard Controller: 8042 software compatible with dedicated open-drain outputs for keyboard/mouse interfaces.

Application Specific Microcontrollers Applications

• Industrial PC motherboard design
• Embedded systems requiring hardware monitoring
• Legacy I/O integration in modern LPC-based platforms
• Systems requiring secure power management and reset generation

Application Specific Microcontrollers Procurement Notes

Verify the suffix 'I' confirms the industrial temperature range (-40°C to +85°C). Confirm the 'SY-TR' designation corresponds to the specific 100-ball WFBGA package and tape-and-reel shipping format as defined in the product identification system. Ensure compatibility with the host system's LPC bus voltage levels.

Application Specific Microcontrollers Selection Notes

Select the SCH3224 over the SCH3227 or SCH3226 if only two full-function serial ports are required, reducing pin count and complexity. Verify that the 100-ball package fits the PCB layout constraints. Check if the integrated parallel port found in the SCH3227 is unnecessary, as the SCH3224 lacks this feature but retains hardware monitoring capabilities.

Application Specific Microcontrollers Part Context

This component belongs to the SCH322x family, which serves as a successor to the SCH311x series. The SCH3224 specifically offers a reduced pin count compared to the SCH3227 while maintaining core Super I/O functions like hardware monitoring and keyboard control. It is designed for cost-sensitive applications where fewer I/O lines are needed.

Application Specific Microcontrollers Replacement Considerations

The SCH3116 is a legacy predecessor with similar functionality but different pinout and configuration requirements. Direct replacement requires verifying strap options and register compatibility. No other current Microchip models offer an identical combination of LPC, HWM, and KBC in this specific package.