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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Microchip Technology SCH3224-SY-TR

Name: SCH3224-SY-TR
Brand: Microchip Technology
SKU: SCH3224-SY-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SCH3224-SY-TR

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

Package:: 100-WFBGA

Datasheet:: SCH3224-SY-TR.pdf

Description:: IC CTLR IO LPC MULT PORT 100BGA

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Product details

Overview

SCH3224-SY-TR from Microchip Technology is a 3.3V LPC Super I/O controller with 5V-tolerant SIO block, integrating keyboard/mouse controller (8042-compatible), two full NS16C550A UARTs, infrared port (IrDA 1.0), hardware monitoring (voltage/temperature/fan), and programmable clock output (16 Hz). It serves as motherboard glue logic in embedded industrial PCs requiring legacy I/O consolidation.

For engineers reviewing the SCH3224-SY-TR datasheet, SCH3224-SY-TR pinout, SCH3224-SY-TR application, or SCH3224-SY-TR equivalent, this page delivers verified functional scope, validated pin mapping for WFBGA-100, confirmed hardware monitor capabilities, and real-world substitution guidance aligned to Microchip's documented family differentiation.

Technical Context

The SCH3224-SY-TR implements an LPC interface compliant with Intel Low Pin Count Specification v1.0, operating at 19–33 MHz bus frequencies. Its integrated 8-bit 8042-compatible microcontroller includes 2 KB ROM and 256 bytes RAM, supporting PS/2 keyboard/mouse protocols and Port 92 access.

Hardware monitoring features include four analog voltage inputs (+2.5V, +5V, +12V, Vccp), internal VCC/Vbat/VTR sensing, dual thermal diode inputs (±1.5°C accuracy), three fan tachometer inputs, and three PWM outputs with automatic temperature-based fan control logic.

Key Specifications

Parameter	Value and Actual Design Meaning
LPC Bus Frequency	19–33 MHz - defines maximum host-to-Super I/O data throughput and timing margin for legacy system integration.
UART Count & Type	2 × full NS16C550A-compatible UARTs - each supports 16-byte FIFO, 1.5 Mbps baud, RS485 auto-direction control, and IRQ sharing.
Hardware Monitor Inputs	+2.5V/+5V/+12V/Vccp voltage sensing + dual external thermal diodes + internal ambient sensor - enables comprehensive power rail and thermal health monitoring.
Fan Control Outputs	3 × PWM outputs with programmable duty cycle - directly drive external fan drivers for closed-loop thermal management without MCU intervention.
GPIO Count	24 general-purpose I/O pins - includes dedicated keyboard reset (nKBDRST), A20M, and LED control functions per Microchip's SCH3224-specific pinout.
Package	100-ball WFBGA (RoHS-compliant) - 5.5 mm × 5.5 mm footprint with 0.5 mm pitch, optimized for space-constrained industrial motherboard layouts.
Operating Temperature	−40°C to +85°C (industrial grade) - qualified for deployment in uncontrolled environments including factory automation and transportation systems.

Pinout & Package

Package: 100-ball WFBGA (5.5 mm × 5.5 mm, 0.5 mm pitch), RoHS-compliant, industrial temperature grade (−40°C to +85°C).

Pin/Terminal	Circuit Role	Design Meaning
LAD0–LAD3	LPC Address/Data Bus	Time-multiplexed 4-bit bidirectional bus for configuration and data transfer with host chipset.
LFRAME#	LPC Frame Signal	Indicates start/end of LPC transaction cycle; synchronizes host-initiated accesses to internal registers.
LDRQ#	LPC DMA Request	Asserted by SCH3224-SY-TR to request DMA service from host for high-bandwidth serial port transfers.
SER_IRQ	Serialized IRQ Output	Open-drain signal shared across all UARTs, IR, and parallel port; requires external pull-up for PCI/ISA interrupt routing.
GP27 / nIO_SMI	System Management Interrupt	Configurable GPIO that asserts SMI# on activity - used for secure firmware event handling and OS-level power management.
nHWM_INT	Hardware Monitor Alert	Active-low open-drain output signaling out-of-limit voltage, temperature, or fan speed - triggers PME or system shutdown.
PWM1–PWM3	Fan Speed Control Outputs	Three independent PWM signals driving external MOSFETs or fan controllers; duty cycle programmable via HWM register set.
FANTACH1–FANTACH3	Fan Tachometer Inputs	Three 5V-tolerant inputs accepting TTL/CMOS fan rotation pulses - enable RPM measurement and closed-loop feedback.
REMOTE1+/−, REMOTE2+/−	Thermal Diode Inputs	Differential pairs for connecting external CPU/GPU thermal diodes - support remote temperature sensing with ±1.5°C accuracy.
nTHERMTRIP	Over-Temperature Shutdown	Open-drain pulse output triggered when internal or remote temperature exceeds programmed threshold - used for hard thermal cutoff.

Key Features

Feature	Design Value
8042 Keyboard Controller	Full software compatibility with Phoenix BIOS and legacy OS drivers; includes 2k ROM, 256B RAM, Port 92, Fast Gate A20, and KRESET outputs.
IrDA 1.0 Infrared Interface	Integrated multiprotocol IR transceiver supporting IrDA 1.0, SHARP ASK, and 480 address options - eliminates need for discrete IR PHY.
Programmable Clock Output	16 Hz square wave output (CLKO) generated internally - provides precise timing reference for RTC or low-power wake-up circuits.
Watchdog Timer	Configurable timeout period with software-reset capability and dedicated WDT pin (GP60) - ensures system recovery from firmware hangs.
Power Good Generators	PWRGD_OUT and PWRGD_PS outputs indicate stable main and standby power rails - used for sequenced power-on reset assertion.
Security Key Register	32-byte battery-backed register for device authentication - retains values during AC loss and supports secure boot verification flows.

Applications

Industrial PC Motherboard	Embedded Automation Controller
Use Scenario: Consolidating legacy I/O (keyboard, serial, parallel, IR) onto a single chip in DIN-rail mounted PLCs with space-constrained PCBs. IC Role / Device Role / Timing Role: Central Super I/O hub managing PS/2 keyboard/mouse, dual RS232/RS485 ports, and hardware monitoring for CPU core voltage and heatsink temperature. Use Value: Reduces BOM count by replacing discrete UARTs, keyboard controllers, and voltage supervisors - lowers assembly cost and improves long-term supply stability.	Use Scenario: Enabling remote diagnostics and firmware updates over serial and IR links in sealed industrial gateways deployed in harsh environments. IC Role / Device Role / Timing Role: Provides IrDA 1.0 physical layer and two high-speed UARTs with 16-byte FIFOs for reliable local field service communication and bootloader access. Use Value: Eliminates need for external level shifters or IR transceivers - simplifies certification for EMC and reduces board area by >12 mm².
Medical Diagnostic Equipment	Retail Point-of-Sale Terminal
Use Scenario: Monitoring power integrity and thermal safety in portable ultrasound or imaging devices requiring FDA-compliant fault logging. IC Role / Device Role / Timing Role: Hardware monitor tracks +5V/+12V rails, Vccp, and two external thermal sensors (CPU + power module); triggers nHWM_INT and nTHERMTRIP on violation. Use Value: Enables automatic shutdown before thermal runaway occurs - satisfies IEC 60601-1 risk management requirements for patient-connected equipment.	Use Scenario: Supporting multi-peripheral connectivity (receipt printer, barcode scanner, cash drawer) in compact POS terminals with limited expansion slots. IC Role / Device Role / Timing Role: Parallel port (EPP/ECP mode) drives receipt printers; dual UARTs interface with scanner and magnetic stripe reader; GPIOs control cash drawer solenoid. Use Value: Delivers IEEE 1284-compliant bi-directional parallel operation without external transceivers - ensures plug-and-play compatibility with legacy retail peripherals.

Industrial PC Motherboard

Embedded Automation Controller

Use Scenario: Consolidating legacy I/O (keyboard, serial, parallel, IR) onto a single chip in DIN-rail mounted PLCs with space-constrained PCBs.

IC Role / Device Role / Timing Role: Central Super I/O hub managing PS/2 keyboard/mouse, dual RS232/RS485 ports, and hardware monitoring for CPU core voltage and heatsink temperature.

Use Value: Reduces BOM count by replacing discrete UARTs, keyboard controllers, and voltage supervisors - lowers assembly cost and improves long-term supply stability.

Use Scenario: Enabling remote diagnostics and firmware updates over serial and IR links in sealed industrial gateways deployed in harsh environments.

IC Role / Device Role / Timing Role: Provides IrDA 1.0 physical layer and two high-speed UARTs with 16-byte FIFOs for reliable local field service communication and bootloader access.

Use Value: Eliminates need for external level shifters or IR transceivers - simplifies certification for EMC and reduces board area by >12 mm².

Medical Diagnostic Equipment

Retail Point-of-Sale Terminal

Use Scenario: Monitoring power integrity and thermal safety in portable ultrasound or imaging devices requiring FDA-compliant fault logging.

IC Role / Device Role / Timing Role: Hardware monitor tracks +5V/+12V rails, Vccp, and two external thermal sensors (CPU + power module); triggers nHWM_INT and nTHERMTRIP on violation.

Use Value: Enables automatic shutdown before thermal runaway occurs - satisfies IEC 60601-1 risk management requirements for patient-connected equipment.

Use Scenario: Supporting multi-peripheral connectivity (receipt printer, barcode scanner, cash drawer) in compact POS terminals with limited expansion slots.

IC Role / Device Role / Timing Role: Parallel port (EPP/ECP mode) drives receipt printers; dual UARTs interface with scanner and magnetic stripe reader; GPIOs control cash drawer solenoid.

Use Value: Delivers IEEE 1284-compliant bi-directional parallel operation without external transceivers - ensures plug-and-play compatibility with legacy retail peripherals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Super I/O controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SCH3226-SY-TR	Same WFBGA-100 package but adds IDE/PCI reset buffers and power button/AC fail recovery (strap-configurable); 40 GPIOs vs. 24.	Required where motherboard needs IDE reset assertion or AC power failure detection logic not present in SCH3224-SY-TR.	Select SCH3226-SY-TR only if strap-controlled IDE reset or AC fail recovery functionality is explicitly needed - otherwise SCH3224-SY-TR offers lower cost and identical core I/O.
IT8786E-S	128-pin QFP package; supports 4 UARTs, 128-byte FIFOs, and additional GPIOs; lacks IrDA and ChiProtect™ parallel port.	Better suited for designs needing higher serial throughput or more I/O flexibility, but requires PCB redesign due to different package and pinout.	Choose IT8786E-S only when expanding beyond two UARTs or requiring larger GPIO count - SCH3224-SY-TR remains optimal for cost-sensitive, space-constrained dual-UART implementations.

Compared with SCH3226-SY-TR, SCH3224-SY-TR omits IDE/PCI reset generation and AC fail recovery to reduce complexity and cost, while retaining identical UART, IR, hardware monitor, and keyboard controller functionality. Against IT8786E-S, it trades pin count and UART quantity for smaller WFBGA footprint and integrated IrDA - making it preferable for compact industrial motherboards.

Availability

SCH3224-SY-TR is available at Aetrix Electronics and suitable for industrial PC motherboards, embedded automation controllers, medical diagnostic equipment, and retail point-of-sale terminals requiring stable component supply across extended product lifecycles.

Supply support for SCH3224-SY-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and connectivity solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software offerings.

The SCH322x family was designed specifically for legacy I/O consolidation in x86-based embedded systems, delivering ACPI-compliant power management, hardware monitoring, and Super I/O functionality in compact WFBGA packages.

FAQ

What is the primary function of the SCH3224-SY-TR in a system architecture?

The SCH3224-SY-TR serves as a Super I/O controller, integrating keyboard/mouse interface (8042-compatible), two NS16C550A UARTs, IrDA 1.0 infrared port, hardware monitoring (voltage/temperature/fan), and programmable clock output. In system architecture, it replaces multiple discrete chips on x86-based motherboards, reducing BOM count and PCB complexity while maintaining full backward compatibility with legacy BIOS and OS drivers. The SCH3224-SY-TR operates as a peripheral on the LPC bus, managed through standard Plug-and-Play configuration registers.

Does the SCH3224-SY-TR support both RS232 and RS485 communication modes?

Yes, the SCH3224-SY-TR supports RS485 auto-direction control mode on its UARTs, enabling half-duplex differential communication without external direction-control logic. Each UART also supports standard RS232 operation using TTL-level signals, with external level shifters required for true RS232 voltage levels. The SCH3224-SY-TR's UARTs are NS16C550A-compatible, featuring 16-byte send/receive FIFOs and programmable baud rate generation up to 1.5 Mbps - making them suitable for both legacy serial peripherals and modern industrial fieldbus interfaces.

How does the hardware monitoring capability of the SCH3224-SY-TR differ from basic voltage supervision ICs?

Unlike basic voltage supervisors, the SCH3224-SY-TR's hardware monitor includes four analog inputs for +2.5V, +5V, +12V, and Vccp; internal sensing of VCC, Vbat, and VTR; dual external thermal diode inputs with ±1.5°C accuracy; internal ambient temperature measurement; and three fan tachometer inputs with three PWM outputs for automatic fan speed control. It provides limit comparison, alerting via nHWM_INT, and over-temperature shutdown via nTHERMTRIP - all accessible over the LPC bus. This integrated approach eliminates the need for separate ADCs, thermal sensors, and fan controllers in resource-constrained embedded designs.

Is the SCH3224-SY-TR pin-compatible with other members of the SCH322x family?

No, the SCH3224-SY-TR is not pin-compatible with SCH3227 or SCH3226, despite sharing the same 100-ball WFBGA package footprint. Pin functions differ significantly - for example, SCH3224-SY-TR lacks IDE/PCI reset outputs and power button control signals present in SCH3226, and its GPIO count (24) and assignment (e.g., GP42 as nIO_PME) are specific to its documented pinout. Microchip explicitly states in DS00002121B that features not listed for SCH3224 must not be activated, confirming functional and pin-level differentiation within the family.

What thermal protection mechanisms are implemented in the SCH3224-SY-TR?

The SCH3224-SY-TR implements two independent thermal protection mechanisms: first, the nHWM_INT pin asserts on out-of-limit temperature conditions detected via internal ambient sensor or external thermal diodes (REMOTE1+/−, REMOTE2+/−); second, the nTHERMTRIP pin generates a pulse output when temperature exceeds a programmable threshold - intended to trigger system reset or shutdown. Both signals are active-low, open-drain, and require external pull-up. Temperature measurement accuracy is ±1.5°C for external diodes and specified for internal sensor per datasheet Section 21.0, enabling compliance with industrial thermal safety requirements.

SCH3224-SY-TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 100-WFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: I/O Controller

Core Processor:: 8042 Keyboard Controller

Program Memory Type:: ROM (2kB)

Controller Series:: -

RAM Size:: 256 x 8

Interface:: IrDA, LPC, Parallel, Serial, UART

Number of I/O:: 24

Voltage - Supply:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 100-WFBGA (8x8)

SCH3224-SY-TR FAQ

1.How can I place an order for SCH3224-SY-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for SCH3224-SY-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SCH3224-SY-TR reliable?

The price and inventory of SCH3224-SY-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH3224-SY-TR is usually 5 days.

3.What payment methods are accepted for SCH3224-SY-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3224-SY-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SCH3224-SY-TR?

SCH3224-SY-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SCH3224-SY-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SCH3224-SY-TR?

For technical support, including SCH3224-SY-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3224-SY-TR requirements.

6.How does Aetrix verify that SCH3224-SY-TR is sourced from the original manufacturer or authorized distributors?

All SCH3224-SY-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SCH3224-SY-TR meets industry standards.

7.What is the process for return or replacement of SCH3224-SY-TR?

All SCH3224-SY-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3224-SY-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SCH3224-SY-TR part is unused and in its original packaging.

Return procedure for SCH3224-SY-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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