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Microchip Technology SCH3224-SY
- Part No.:
- SCH3224-SY
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 100-WFBGA
- Datasheet:
-
SCH3224-SY.pdf
- Description:
- IC CTLR IO LPC MULT PORT 100BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
SCH3224-SY from Microchip Technology is a 3.3V Low Pin Count (LPC) Super I/O controller with 5V-tolerant SIO block, integrated 8042-compatible keyboard controller, dual NS16C550A UARTs, hardware monitoring, and 24 GPIOs. It supports ACPI 2.0, PC99/PC2001 compliance, and operates across industrial temperature range (−40°C to +85°C) in a 100-ball WFBGA package. Used in embedded industrial motherboards for legacy I/O consolidation.
For engineers reviewing the SCH3224-SY datasheet, SCH3224-SY pinout, SCH3224-SY application, or SCH3224-SY equivalent, key selection criteria include LPC bus timing (19–33 MHz), dual full-function serial ports with 16-byte FIFOs, hardware voltage/temperature/fan monitoring, programmable clock output (up to 16 Hz), and 24 GPIOs with dedicated power-button and reset control logic.
Technical Context
The SCH3224-SY implements an LPC interface compliant with Intel's Low Pin Count Specification v1.0, supporting 19–33 MHz bus frequencies and serialized IRQ delivery. Its integrated 8042 keyboard controller includes 2 kB ROM, 256 B RAM, and Phoenix BIOS compatibility, with fast Gate A20 and KRESET outputs.
Hardware monitoring features include three analog voltage inputs (+2.5V, +5V, +12V), VCCP core voltage sensing, internal/external thermal diode interfaces (±1.5°C accuracy), and three PWM fan control outputs with automatic temperature-based regulation triggered via nHWM_INT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - defines maximum host-to-Super I/O data throughput and configuration register access speed |
| Serial Ports | 2 full-function UARTs - each supports NS16C550A mode with 16-byte TX/RX FIFOs and baud rates up to 1.5 Mbps |
| GPIO Count | 24 pins - configurable as inputs/outputs with interrupt capability; includes dedicated PS/2 power button and AC fail recovery logic |
| Hardware Monitor Inputs | +2.5V, +5V, +12V, VCCP, VCC, VBAT, VTR - enables real-time system power rail validation and fault reporting via nHWM_INT |
| Temperature Sensing | Internal ambient + 2 external thermal diodes - ±1.5°C accuracy enables closed-loop fan control and over-temperature shutdown via nTHERMTRIP |
| Package | 100-ball WFBGA - 6×6 mm footprint with 0.5 mm pitch; RoHS-compliant and qualified for industrial temperature operation |
| Operating Temperature | −40°C to +85°C - validated for use in uncontrolled industrial environments without forced airflow |
Pinout & Package
Package: 100-ball WFBGA (6×6 mm, 0.5 mm pitch), RoHS-compliant, industrial temperature grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD0–LAD3 | LPC Address/Data Bus | Time-multiplexed 4-bit bidirectional bus for configuration and runtime data transfer with host chipset |
| LFRAME# | LPC Frame Signal | Indicates start of LPC transaction cycle; synchronizes address/data phase transitions |
| LDRQ# | LPC DMA Request | Asserted by SCH3224-SY to request DMA channel access from host for high-bandwidth UART/parallel transfers |
| PCI_RESET# | PCI Reset Output | Open-drain active-low signal driven by SCH3224-SY to reset attached PCI peripherals on system power-up or watchdog timeout |
| nRSMRST | Resume Reset Output | Active-low reset pulse generated after resume from S3/S4 sleep states to reinitialize platform logic |
| nHWM_INT | Hardware Monitor Interrupt | Open-drain alert signal asserted when monitored voltage, temperature, or fan speed exceeds programmed limits |
| nTHERMTRIP | Over-Temperature Shutdown | Dedicated open-drain output pulsed on critical thermal violation to force system-level reset or power-down |
| PWM1–PWM3 | Fan Speed Control Outputs | Three independent PWM generators (0–100% duty cycle) for closed-loop thermal management of system fans |
| FANTACH1–FANTACH3 | Fan Tachometer Inputs | Three edge-triggered inputs accepting 2-pulse-per-revolution signals for RPM measurement and feedback |
| GP0–GP23 | General Purpose I/O | 24 configurable digital I/Os supporting interrupt-on-change, pull-up/down, and dedicated functions (e.g., nKBDRST, A20M) |
Key Features
| Feature | Design Value |
|---|---|
| ACPI 2.0 Compliance | Enables standardized OS-directed power state transitions (S0–S5) and wake-event handling without custom firmware |
| Dual Full-Function UARTs | Each supports 16-byte FIFOs, RS-485 auto-direction control, and IRQ sharing - reduces CPU overhead in multi-serial industrial gateways |
| Hardware Voltage Monitoring | Measures +2.5V, +5V, +12V, VCCP, VCC, VBAT, VTR with programmable thresholds - eliminates need for external supervisor ICs |
| Programmable Clock Output | Configurable 16 Hz square wave output (CLKO) - provides precise timing reference for RTC or low-power subsystems |
| Security Key Register | 32-byte battery-backed register for device authentication - supports secure boot chain verification in trusted platforms |
| Watchdog Timer | Configurable timeout with software-reset capability and nWDT output - ensures deterministic recovery from firmware hangs in headless systems |
Applications
| Industrial Embedded Controller | Legacy-Interface Motherboard |
|---|---|
Use Scenario: Fan-cooled DIN-rail PLC with dual RS-232/485 serial interfaces, temperature-monitored power rails, and PS/2 keyboard support. IC Role / Device Role / Timing Role: Central Super I/O hub managing serial communication, hardware health monitoring, and keyboard/mouse interface via integrated 8042 controller. Use Value: Consolidates discrete UARTs, voltage supervisors, fan controllers, and keyboard logic into single 100-ball WFBGA - reduces BOM count and PCB area by >70% versus discrete solution. |
Use Scenario: ATX motherboard for industrial PC requiring backward compatibility with DOS-based diagnostics tools and legacy BIOS extensions. IC Role / Device Role / Timing Role: LPC-connected Super I/O providing ISA Plug-and-Play register set, serial/parallel/IR ports, and ACPI-compliant power management logic. Use Value: Enables PC99/PC2001 compliance with minimal firmware changes; supports 480 I/O address options and IRQ sharing to avoid resource conflicts in complex I/O configurations. |
| Thermal Management Module | Secure Boot Platform |
Use Scenario: Fan-controlled network appliance with dual thermal zones (CPU + ambient), variable-speed cooling, and over-temperature shutdown. IC Role / Device Role / Timing Role: Hardware monitor with three PWM outputs, three tachometer inputs, and ±1.5°C diode-sensed temperature measurement. Use Value: Delivers closed-loop fan control without host CPU intervention; nTHERMTRIP output triggers immediate hardware reset at critical junction temperatures (>105°C). |
Use Scenario: Trusted computing module requiring tamper-resistant device identity and authenticated firmware loading. IC Role / Device Role / Timing Role: Security anchor providing 32-byte battery-backed key register accessible only via LPC configuration space with write-protection lock bits. Use Value: Enables cryptographic binding of firmware images to hardware identity; prevents unauthorized firmware updates or cloning in certified industrial deployments. |
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 | 100-ball WFBGA package, identical pinout, adds IDE/PCI reset buffers and power button/AC fail support via strap option | Required where motherboard design needs additional reset outputs or enhanced power-fail recovery beyond SCH3224-SY capabilities | Select SCH3226-SY if IDE reset generation or strap-configurable AC fail logic is needed; otherwise SCH3224-SY offers optimal cost/performance balance |
| IT8786E-S | 128-pin QFP package, supports 4 serial ports and parallel port; lacks thermal diode inputs and has different LPC timing margins | Suitable for desktop-oriented designs needing more legacy I/O but not industrial-grade thermal monitoring or compact WFBGA footprint | Choose IT8786E-S only for non-industrial applications where QFP assembly is preferred and extended serial/parallel count justifies larger package and reduced thermal accuracy |
Compared with SCH3226-SY, SCH3224-SY omits strap-configurable IDE/PCI reset outputs and AC fail logic - reducing complexity and cost for fixed-function industrial boards. Versus IT8786E-S, SCH3224-SY trades serial port count for superior thermal sensing accuracy (±1.5°C vs. ±3°C), smaller WFBGA footprint, and guaranteed industrial temperature operation.
Availability
SCH3224-SY is available at Aetrix Electronics and suitable for industrial embedded controllers, legacy-interface motherboards, thermal management modules, and secure boot platforms requiring stable component supply and long-term lifecycle support.
Supply support for SCH3224-SY 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 x86-based industrial and embedded platforms requiring consolidated legacy I/O, robust hardware monitoring, and ACPI-compliant power management in space-constrained WFBGA packages.
FAQ
What is the maximum baud rate supported by the SCH3224-SY serial ports?
The SCH3224-SY integrates two NS16C550A-compatible UARTs supporting baud rates up to 1.5 Mbps. Each UART includes 16-byte transmit and receive FIFOs, programmable baud rate generators, and modem control circuitry - enabling high-throughput serial communication in industrial gateways and diagnostic tools without CPU polling overhead.
Does the SCH3224-SY support hardware monitoring of processor core voltage (VCCP)?
Yes, the SCH3224-SY monitors VCCP (processor core voltage) alongside +2.5V, +5V, +12V, VCC, VBAT, and VTR. Voltage measurements are performed via dedicated analog inputs with programmable upper/lower thresholds; out-of-limit conditions trigger the nHWM_INT signal and can generate PME wakeup events for OS-level response.
How many GPIOs does the SCH3224-SY provide, and what are their key capabilities?
The SCH3224-SY provides 24 general-purpose I/O pins (GP0–GP23). These support interrupt-on-change, configurable pull-up/pull-down, and dedicated functions including PS/2 power button control, A20 gate enable, keyboard reset (nKBDRST), and LED drivers (nLED1/nLED2). All GPIOs are software-configurable via LPC configuration registers.
Is the SCH3224-SY compatible with ACPI 2.0 and PC99/PC2001 specifications?
Yes, the SCH3224-SY is fully compliant with ACPI 2.0 and PC99/PC2001 standards. It implements required power-state signaling (S0–S5), System Management Interrupt (SMI), Programmable Wake-up Event (PME), and Serial IRQ interface - enabling seamless integration into modern BIOS/UEFI firmware stacks without custom power management drivers.
What thermal sensing accuracy does the SCH3224-SY achieve for external temperature monitoring?
The SCH3224-SY achieves ±1.5°C accuracy for external temperature measurements using two thermal diode inputs (REMOTE1+/−, REMOTE2+/−). Combined with internal ambient sensing, this enables precise closed-loop fan control and reliable over-temperature detection - critical for industrial systems operating in uncontrolled thermal environments.
SCH3224-SY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 100-WFBGA
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for SCH3224-SY through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3224-SY 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 reliable?
The price and inventory of SCH3224-SY 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 is usually 5 days.
3.What payment methods are accepted for SCH3224-SY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3224-SY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3224-SY?
SCH3224-SY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3224-SY 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?
For technical support, including SCH3224-SY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3224-SY requirements.
6.How does Aetrix verify that SCH3224-SY is sourced from the original manufacturer or authorized distributors?
All SCH3224-SY 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 meets industry standards.
7.What is the process for return or replacement of SCH3224-SY?
All SCH3224-SY units undergo pre-shipment inspection (PSI). If there is an issue with SCH3224-SY, 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 part is unused and in its original packaging.
Return procedure for SCH3224-SY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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