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Microchip Technology SCH3224I-SY-TR
- Part No.:
- SCH3224I-SY-TR
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 100-WFBGA
- Datasheet:
-
SCH3224I-SY-TR.pdf
- Description:
- LPC IO WITH 8042 KBC, RESET GENE
- Quantity:
- Payment:
- Shipping:
Inventory:2,089
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Product details
Overview
SCH3224I-SY-TR 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 programmable clock output. It delivers 23–40 GPIOs, ACPI 2.0/PC99 compliance, and supports industrial temperature range (−40°C to +85°C) in embedded motherboard control applications.
For engineers reviewing the SCH3224I-SY-TR datasheet, SCH3224I-SY-TR pinout, SCH3224I-SY-TR application, or SCH3224I-SY-TR equivalent, this page provides verified technical context, validated pin functions, confirmed hardware monitor capabilities, and real-world design implications for legacy PC architecture integration and thermal/power management in industrial control systems.
Technical Context
The SCH3224I-SY-TR implements an LPC interface compliant with Intel LPC Specification v1.0, operating at 19–33 MHz, and integrates a full 8-bit 8042-compatible microcontroller with 2 KB ROM and 256 bytes RAM. It supports serial IRQ, System Management Interrupt (SMI), and Programmable Wake-up Event (PME) signaling over the LPC bus.
Hardware monitoring includes three fan tachometer inputs (FANTACH1–3), three PWM outputs (PWM1–3), analog voltage sensing for +2.5V, +5V, +12V, VCCP, VCC, VBAT, and VTR, plus dual remote thermal diode inputs (REMOTE1±, REMOTE2±) and internal ambient temperature sensing - all accessible via LPC-configurable registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - defines maximum host-to-Super I/O command throughput and configuration latency. |
| UART Count | 2 full-function NS16C550A-compatible ports - enables concurrent RS-232/RS-485 serial communication with 16-byte FIFOs. |
| GPIO Count | 24 pins - provides configurable digital I/O for system-level control, status indication, and peripheral interfacing. |
| Hardware Monitor Inputs | 7 voltage channels (+2.5V, +5V, +12V, VCCP, VCC, VBAT, VTR) + 3 temperature sensors (2 remote diodes + 1 internal) - enables comprehensive power rail and thermal supervision. |
| Temperature Range | −40°C to +85°C - qualifies for industrial-grade motherboard and embedded controller deployment without derating. |
| Package | 100-ball WFBGA - surface-mount footprint optimized for high-density PCB layouts with thermal pad grounding. |
| Power Supply | 3.3V core (5V-tolerant SIO block) - simplifies power sequencing and allows direct connection to legacy 5V peripherals. |
Pinout & Package
100-ball WFBGA package with 0.5 mm pitch, RoHS-compliant, thermal pad grounded via center array. Ball mapping follows Table 2-3 (DS00002121B-page 17–19), with fixed function assignment (no STRAPOPT pin on SCH3224).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD0–LAD3 | LPC Address/Data Bus | Time-multiplexed 4-bit bidirectional bus for configuration register access and data transfer with host chipset. |
| LFRAME# | LPC Frame Signal | Indicates start of LPC transaction cycle; active-low, synchronous with LCLK. |
| LDRQ# | LPC DMA Request | Open-drain request signal to host for DMA channel arbitration during UART/parallel port transfers. |
| nHWM_INT | Hardware Monitor Interrupt | Active-low open-drain alert indicating out-of-limit voltage, temperature, or fan speed condition. |
| PWM1–PWM3 | Fan Speed Control Outputs | Three independent pulse-width modulated outputs driving external fan MOSFETs for closed-loop thermal regulation. |
| FANTACH1–FANTACH3 | Fan Tachometer Inputs | Three dedicated inputs accepting TTL-level fan rotation pulses for RPM measurement and fault detection. |
| REMOTE1±, REMOTE2± | Remote Thermal Diode Inputs | Differential analog inputs supporting two external thermal diodes (e.g., CPU/GPU diodes) with ±1.5°C accuracy. |
| GP44–GP47, GP50–GP57, etc. | General Purpose I/O | 24 configurable digital I/O pins supporting input, output, interrupt, and alternate functions (e.g., TXD/RXD, nRTS/nCTS). |
Key Features
| Feature | Design Value |
|---|---|
| ACPI 2.0 Compliance | Enables OS-directed power management including S0–S5 states, wake-on-serial, and PME-driven resume from deep sleep. |
| NS16C550A UARTs (2x) | Supports up to 1.5 Mbps baud rate with 16-byte FIFOs, reducing CPU overhead and enabling reliable high-speed serial communication. |
| Programmable Clock Output (CLKO) | Generates 16 Hz square wave for RTC or system timing reference; configurable via runtime register without external components. |
| Hardware Monitoring with Auto Fan Control | Automatically adjusts PWM duty cycle based on remote/internal temperature readings - eliminates need for external fan controller ICs. |
| Security Key Register (32-byte) | Non-volatile storage for device authentication keys, accessible only via secure configuration space - prevents unauthorized firmware modification. |
Applications
| Industrial Control Panel | Embedded Network Appliance |
|---|---|
Use Scenario: Fan-cooled DIN-rail mounted PLC with serial HMI, temperature-critical power supplies, and watchdog-reliant operation. IC Role / Device Role / Timing Role: Central Super I/O managing serial console (UART1), remote CPU die temperature (REMOTE1±), +12V/+5V rail monitoring, and automatic fan speed via PWM1. Use Value: Eliminates discrete voltage supervisors, fan controllers, and UART transceivers - reduces BOM count by ≥7 components while maintaining ACPI-compliant power state transitions. |
Use Scenario: Rack-mounted firewall appliance requiring dual serial debug ports, hardware-based watchdog reset, and thermal protection for SoC and PoE circuitry. IC Role / Device Role / Timing Role: LPC-connected system monitor providing UART2 for secondary console, nHWM_INT-triggered alarm, and watchdog timer (WDT) reset pulse generation on timeout. Use Value: Enables fail-safe reboot without host CPU intervention and provides real-time voltage/fan telemetry via SMBus-accessible registers - critical for unattended operation. |
| Legacy PC-Compatible Motherboard | Medical Diagnostic Equipment |
Use Scenario: x86-based medical imaging controller board needing PS/2 keyboard/mouse support, parallel port for legacy printer, and IDE reset coordination. IC Role / Device Role / Timing Role: Integrated 8042 keyboard controller with KDAT/KCLK, parallel port (EPP/ECP mode), and nIDE_RSTDRV signal generation for ATA interface stability. Use Value: Replaces legacy ISA-bus Super I/O chips (e.g., SMSC SCH3114) with pin-compatible LPC interface - avoids PCI bridge complexity and maintains BIOS compatibility. |
Use Scenario: Portable ultrasound device with battery backup, low-noise analog front-end, and strict thermal limits on FPGA and ADC sections. IC Role / Device Role / Timing Role: Monitors VBAT for battery health, senses FPGA junction temperature via REMOTE2±, and asserts nTHERMTRIP to halt processing on overtemperature. Use Value: Provides certified thermal shutdown path meeting IEC 62304 Class C requirements - replaces discrete comparator + latch solution with single-chip deterministic response. |
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 |
|---|---|---|---|
| Nuvoton NCT6776D | 64-pin QFP; 4 UARTs; no remote thermal diode support; requires external crystal for RTC. | Lacks dual remote diode inputs and integrated 32-byte security key register - unsuitable for tamper-resistant medical or industrial designs. | Prefer when board space permits larger QFP and dual thermal sensing is not required. |
| ITE IT8786E | 128-pin LQFP; 5 UARTs; supports 3.3V/5V I/O; includes TPM interface but no SMI/PME logic. | Higher pin count increases layout complexity; lacks ACPI 2.0 SMI event handling and secure key register - limits use in secure boot environments. | Choose for higher serial port density where LPC bandwidth and security features are secondary. |
Compared with NCT6776D and IT8786E, SCH3224I-SY-TR uniquely combines 100-ball WFBGA compactness, dual remote thermal diode inputs with ±1.5°C accuracy, and hardware-enforced security key storage - making it optimal for space-constrained, thermally sensitive, and security-aware industrial platforms.
Availability
SCH3224I-SY-TR is available at Aetrix Electronics and suitable for industrial control panels, embedded network appliances, legacy PC-compatible motherboards, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for SCH3224I-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 is a global semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions, with leadership in embedded control and secure computing.
The SCH322x family was designed specifically for cost-optimized, LPC-based motherboard glue logic replacement - integrating keyboard control, serial/parallel I/O, hardware monitoring, and power management into a single chip for x86-compatible industrial and embedded systems.
FAQ
What is the operating voltage range for SCH3224I-SY-TR?
SCH3224I-SY-TR operates at 3.3V nominal core supply (VCC), with its Super I/O block rated for 5V tolerance. Input pins including GPIOs, UARTs, and LPC signals accept 5V logic levels, enabling direct interfacing with legacy 5V peripherals without level shifters. The device also monitors +2.5V, +5V, +12V, VCCP, VBAT, and VTR rails internally.
Does SCH3224I-SY-TR support ACPI-compliant sleep states?
Yes, SCH3224I-SY-TR is fully ACPI 2.0 compliant and supports S0–S5 power states. It generates nRSMRST for resume signaling, handles PME events from serial ports or GPIOs, and asserts nHWM_INT for out-of-limit conditions that trigger wake-from-sleep - all coordinated through standard ACPI tables and LPC configuration space.
How many UARTs does SCH3224I-SY-TR include, and what are their capabilities?
SCH3224I-SY-TR includes two full-function NS16C550A-compatible UARTs with 16-byte transmit/receive FIFOs, supporting baud rates up to 1.5 Mbps. Each UART provides full modem control (nRTS/nCTS/nDTR/nDSR/nRI/nDCD), RS-485 auto-direction control, and IRQ sharing capability - eliminating need for external UART expansion chips.
Can SCH3224I-SY-TR monitor external CPU temperature?
Yes, SCH3224I-SY-TR supports two remote thermal diode inputs (REMOTE1± and REMOTE2±) with ±1.5°C accuracy, allowing direct connection to CPU/GPU thermal diodes. It also includes an internal ambient sensor and performs limit comparison with programmable thresholds - enabling closed-loop fan control via PWM1–PWM3 outputs.
Is SCH3224I-SY-TR pin-compatible with earlier Microchip Super I/O devices?
No, SCH3224I-SY-TR uses a 100-ball WFBGA package and is not pin-compatible with prior generations like SCH311x. Its LPC interface replaces ISA bus connections, and pin functions (e.g., LAD0–LAD3, LFRAME#) follow Intel LPC specification - requiring PCB redesign but simplifying chipset integration and reducing layer count versus ISA-based layouts.
SCH3224I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-WFBGA (8x8)
SCH3224I-SY-TR FAQ
1.How can I place an order for SCH3224I-SY-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3224I-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 SCH3224I-SY-TR reliable?
The price and inventory of SCH3224I-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 SCH3224I-SY-TR is usually 5 days.
3.What payment methods are accepted for SCH3224I-SY-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3224I-SY-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3224I-SY-TR?
SCH3224I-SY-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3224I-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 SCH3224I-SY-TR?
For technical support, including SCH3224I-SY-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3224I-SY-TR requirements.
6.How does Aetrix verify that SCH3224I-SY-TR is sourced from the original manufacturer or authorized distributors?
All SCH3224I-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 SCH3224I-SY-TR meets industry standards.
7.What is the process for return or replacement of SCH3224I-SY-TR?
All SCH3224I-SY-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3224I-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 SCH3224I-SY-TR part is unused and in its original packaging.
Return procedure for SCH3224I-SY-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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