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Microchip Technology SCH3226-SY-TR
- Part No.:
- SCH3226-SY-TR
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 100-WFBGA
- Datasheet:
-
SCH3226-SY-TR.pdf
- Description:
- LPC IO WITH 8042 KBC, RESET GENE
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SCH3226-SY-TR from Microchip Technology is a 3.3V LPC Super I/O controller with 5V-tolerant SIO block, integrated 8042 keyboard controller, four full-function UARTs (NS16C550A-compatible), hardware monitoring (voltage/temperature/fan), and ACPI 2.0 compliance - deployed in industrial embedded motherboards for legacy I/O consolidation.
For engineers reviewing the SCH3226-SY-TR datasheet, SCH3226-SY-TR pinout, SCH3226-SY-TR application, or SCH3226-SY-TR equivalent, this page delivers verified functional scope, strap-dependent pin mapping, hardware monitor register access, and validated drop-in alternatives for PC/AT-style platform design.
Technical Context
The SCH3226-SY-TR implements an LPC interface compliant with Intel Low Pin Count Specification v1.0, supporting bus frequencies from 19 MHz to 33 MHz and Serial IRQ for PCI systems. It integrates an 8-bit 8042-compatible microcontroller with 2 KB ROM and 256 bytes RAM, delivering keyboard/mouse control via dedicated open-drain outputs and Port 92 support.
Hardware monitoring includes three fan tachometer inputs, three PWM fan control outputs, and analog sensing of +2.5V, +5V, +12V, Vccp, VCC, Vbat, and Vtr supplies - with dual thermal diode inputs (±1.5°C accuracy) and internal ambient temperature measurement.
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 motherboard integration. |
| UART Count & Type | 4 × NS16C550A-compatible UARTs with 16-byte FIFOs - enables simultaneous serial device connectivity (modems, GPS, industrial sensors) without CPU polling overhead. |
| Baud Rate Support | Up to 1.5 Mbps - supports high-speed RS-232/RS-485 communication in automation and test equipment. |
| Hardware Monitor Inputs | +2.5V, +5V, +12V, Vccp, VCC, Vbat, Vtr, and two external thermal diodes - provides full power-rail and thermal visibility for system-level health management. |
| GPIO Count | 40 programmable I/O pins - includes VID-compatible inputs (0–6) and dedicated keyboard/mouse control signals for flexible board-level interfacing. |
| Package | 100-ball WFBGA - RoHS-compliant, surface-mount package optimized for compact industrial motherboard layouts with thermal pad grounding. |
| Operating Temperature | −40°C to +85°C (industrial grade) - ensures reliable operation in uncontrolled environments such as factory automation and transportation electronics. |
Pinout & Package
100-ball WFBGA package with 0.5 mm pitch, thermal pad on underside for PCB heat dissipation. Pin functions depend on STRAPOPT strap: when tied to VTR (STRAPOPT=1), Device ID = 0x7F; when tied to VSS (STRAPOPT=0), Device ID = 0x7D. Ball L8 is the STRAPOPT input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD0–LAD3 | LPC Address/Data Bus | Time-multiplexed bidirectional signals carrying configuration and runtime I/O data over LPC interface. |
| LFRAME# | LPC Frame Signal | Indicates start of LPC transaction cycle; synchronized with LCLK for host-initiated access. |
| LDRQ# | LPC DMA Request | Asserted by SCH3226-SY-TR to request DMA service from host LPC controller. |
| nHWM_INT | Hardware Monitor Interrupt | Active-low open-drain output signaling out-of-limit voltage, temperature, or fan speed conditions. |
| PWM1–PWM3 | Fan Speed Control Outputs | Three independent pulse-width modulated outputs driving external fan MOSFETs for closed-loop thermal management. |
| FANTACH1–FANTACH3 | Fan Tachometer Inputs | Accepts TTL-level pulse trains from fan tachometer outputs to measure RPM and detect stall/failure. |
| REMOTE1+/−, REMOTE2+/− | Thermal Diode Inputs | Differential inputs for connecting external thermal diodes (e.g., CPU/GPU diodes) with ±1.5°C measurement accuracy. |
| GP44–GP47 | Configurable GPIO / IDE/PCI Reset | Strap-selectable: either UART TXD6/RXD6/nSCIN6/nSCOUT6 or nIDE_RSTDRV/nPCIRST1–3 - enables shared pin resource allocation. |
Key Features
| Feature | Design Value |
|---|---|
| ACPI 2.0 & PC99/PC2001 Compliance | Enables OS-directed power state transitions (S0–S5) and standardized hardware abstraction for Windows/Linux platform firmware. |
| Programmable Clock Output (16 Hz) | Provides precise low-frequency timing reference for RTC or watchdog timer synchronization without external crystal. |
| IrDA 1.0 + SHARP ASK Infrared Interface | Supports bidirectional IR communication at up to 115.2 kbps for remote control and data transfer in space-constrained designs. |
| Security Key Register (32-byte) | Non-volatile storage for device authentication keys, enabling secure boot and firmware integrity verification in trusted platforms. |
| Watchdog Timer with Software Control | Configurable timeout period prevents system lockup; reset pulse width selectable via external strapping for compatibility with diverse reset logic. |
| Power Button & AC Fail Recovery Logic | Hardware-level detection and debouncing of front-panel power button events plus automatic recovery after AC power interruption. |
Applications
| Industrial Control Panel | Legacy Embedded Server Board |
|---|---|
Use Scenario: Fan-cooled PLC rack with multiple serial fieldbus interfaces (RS-485 Modbus, RS-232 HMI), real-time voltage/temperature supervision, and keyboard-based local configuration. IC Role / Device Role / Timing Role: Central Super I/O hub managing UARTs, hardware monitor, keyboard controller, and reset generation - replacing discrete logic and reducing BOM count. Use Value: Consolidates 4 UARTs, thermal diode sensing, 3 PWM fan controls, and power-good sequencing into single 100-ball WFBGA, cutting PCB area by >65% vs. discrete solution. |
Use Scenario: x86-based edge server with PS/2 keyboard/mouse, dual serial console ports, infrared service channel, and hardware-enforced thermal shutdown for CPU/GPU zones. IC Role / Device Role / Timing Role: LPC-connected Super I/O providing 8042 emulation, serial IRQ routing, and hardware monitor interrupt (nHWM_INT) to chipset for OS-level thermal policy enforcement. Use Value: Enables ACPI S4/S5 sleep states with accurate Vccp/Vbat monitoring and thermtrip-driven forced shutdown - meeting UL 62368-1 safety requirements. |
| Medical Diagnostic Equipment | Ruggedized Transportation Terminal |
Use Scenario: Portable ultrasound unit requiring EMI-robust serial communication (ultrasound probe, barcode scanner), battery-backed security key storage, and ambient + remote temperature tracking. IC Role / Device Role / Timing Role: Dual-role device: UART controller for diagnostic peripherals and hardware monitor for battery voltage (VBAT), processor core (Vccp), and sensor junction temperatures. Use Value: Battery-backed 32-byte security key register ensures HIPAA-compliant device authentication; Vbat monitoring triggers graceful shutdown before data loss. |
Use Scenario: In-vehicle infotainment terminal exposed to −40°C to +85°C ambient, needing RS-485 auto-direction control for fleet telematics, IR remote pairing, and fan-cooled display backlight. IC Role / Device Role / Timing Role: Industrial-grade Super I/O delivering RS-485 auto-direction mode, IrDA 1.0 link, and PWM-controlled fan drive - all operating across full temperature range. Use Value: RS-485 auto-direction eliminates external transceiver control logic; PWM fan outputs maintain display thermal stability without software intervention. |
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 | 128-pin QFP; supports 6 UARTs, no IrDA; requires external clock source for 16 Hz output. | Targeted at modern ATX motherboards with higher pin count and PCIe-based platforms - lacks strap-selectable IDE/PCI reset outputs. | Select when needing >4 UARTs and QFP assembly compatibility; avoid if IrDA or strap-configurable reset routing is required. |
| ITE IT8786E | 128-pin QFP; supports 5 UARTs, 2 parallel ports, no thermal diode inputs - uses internal ADC only for voltage monitoring. | Designed for consumer desktop boards; lacks industrial temp grade and Vccp/Vbat monitoring - no nTHERMTRIP output. | Choose for cost-sensitive commercial designs where thermal diode sensing and thermtrip safety signal are not required. |
Compared with NCT6776D and IT8786E, SCH3226-SY-TR uniquely combines strap-selectable IDE/PCI reset outputs, dual thermal diode inputs with ±1.5°C accuracy, and IrDA 1.0 support in a 100-ball WFBGA - making it optimal for space-constrained industrial platforms requiring certified thermal safety and legacy I/O consolidation.
Availability
SCH3226-SY-TR is available at Aetrix Electronics and suitable for industrial control panels, legacy embedded server boards, medical diagnostic equipment, and ruggedized transportation terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SCH3226-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 global semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions for industrial, automotive, and consumer markets.
The SCH3226-SY-TR belongs to Microchip's SCH322x Super I/O family, designed specifically to replace legacy ISA-based I/O controllers in LPC-based embedded x86 platforms while adding hardware monitoring, security, and power management features.
FAQ
What is the function of the STRAPOPT pin on SCH3226-SY-TR?
The STRAPOPT pin (Ball L8) configures SCH3226-SY-TR functionality: when tied to VTR, it enables legacy SCH3114 feature set and sets Device ID to 0x7F; when tied to VSS, it selects SCH3116 features and Device ID 0x7D. This strap also determines whether GP44–GP47 operate as UART signals or IDE/PCI reset outputs - a hardware-level selection that cannot be changed in software. SCH3226-SY-TR must be designed with correct STRAPOPT biasing per target system requirements.
Does SCH3226-SY-TR support RS-485 auto-direction control?
Yes, SCH3226-SY-TR supports RS-485 auto-direction control on its UARTs. The hardware automatically asserts nRTS when the transmit FIFO is loaded and deasserts it when empty - eliminating need for external direction-control logic. This feature is implemented per UART and applies to all four full-function serial ports, enabling robust half-duplex communication in industrial fieldbus applications without additional components.
How many thermal diode inputs does SCH3226-SY-TR provide, and what is their accuracy?
SCH3226-SY-TR provides two dedicated differential thermal diode inputs (REMOTE1+/− and REMOTE2+/−) for measuring external component temperatures, with measurement accuracy of ±1.5°C. These inputs support standard CPU/GPU thermal diodes and are used alongside the internal ambient temperature sensor to enable multi-zone thermal management. Voltage and temperature limits are programmable via hardware monitor registers accessible over the LPC bus.
Can SCH3226-SY-TR generate a system reset on over-temperature condition?
Yes, SCH3226-SY-TR includes a dedicated nTHERMTRIP output (Ball B6) that pulses low upon programmed over-temperature detection - independent of nHWM_INT. This signal can be routed directly to the chipset's reset input or external supervisor IC to force immediate system shutdown, satisfying safety-critical thermal protection requirements in industrial and medical applications. The trip threshold and hysteresis are configurable via hardware monitor registers.
Is the keyboard controller in SCH3226-SY-TR fully 8042 software compatible?
Yes, the integrated keyboard controller in SCH3226-SY-TR is fully 8042 software compatible, including Port 92 support, Fast Gate A20, KRESET outputs, and asynchronous access to status/data registers. It contains 2 KB of program ROM and 256 bytes of data RAM, executes Phoenix Keyboard BIOS ROM, and supports both interrupt and polling access modes - ensuring seamless integration with legacy BIOS and UEFI firmware stacks without driver modification.
SCH3226-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:
- 40
- Voltage - Supply:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-WFBGA (8x8)
SCH3226-SY-TR FAQ
1.How can I place an order for SCH3226-SY-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3226-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 SCH3226-SY-TR reliable?
The price and inventory of SCH3226-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 SCH3226-SY-TR is usually 5 days.
3.What payment methods are accepted for SCH3226-SY-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3226-SY-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3226-SY-TR?
SCH3226-SY-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3226-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 SCH3226-SY-TR?
For technical support, including SCH3226-SY-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3226-SY-TR requirements.
6.How does Aetrix verify that SCH3226-SY-TR is sourced from the original manufacturer or authorized distributors?
All SCH3226-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 SCH3226-SY-TR meets industry standards.
7.What is the process for return or replacement of SCH3226-SY-TR?
All SCH3226-SY-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3226-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 SCH3226-SY-TR part is unused and in its original packaging.
Return procedure for SCH3226-SY-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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