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Microchip Technology SCH3227-SZ-TR
- Part No.:
- SCH3227-SZ-TR
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 144-WFBGA
- Datasheet:
-
SCH3227-SZ-TR.pdf
- Description:
- IC CTLR IO LPC MULT PORT 144BGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SCH3227-SZ-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 40 GPIOs - used in industrial motherboards requiring ACPI 2.0-compliant power management, serial expansion, and system health supervision.
For engineers reviewing the SCH3227-SZ-TR datasheet, SCH3227-SZ-TR pinout, SCH3227-SZ-TR application, or SCH3227-SZ-TR equivalent, this page delivers verified specifications, strap-dependent pin functions, hardware monitor register access paths, and validated alternatives for legacy PC platform design continuity.
Technical Context
The SCH3227-SZ-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 outputs, analog sensing of +2.5V/+5V/+12V/Vccp/VCC/Vbat/Vtr, dual thermal diode inputs (±1.5°C accuracy), and internal ambient temperature measurement - all accessible via LPC-configurable registers and signaled through nHWM_INT and THERMTRIP pins.
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 register access latency. |
| UART Count & Type | 4 × NS16C550A-compatible UARTs with 16-byte FIFOs - enables simultaneous high-speed serial communication (up to 1.5 Mbps) across multiple peripherals without CPU polling overhead. |
| GPIO Count | 40 programmable I/O pins - supports flexible board-level signal routing, LED control, strap configuration, and custom logic interfacing. |
| Hardware Monitor Inputs | +2.5V, +5V, +12V, Vccp, VCC, Vbat, Vtr + 2× thermal diodes + internal sensor - provides comprehensive real-time system health telemetry for embedded safety-critical applications. |
| Package | 144-ball WFBGA (RoHS-compliant) - surface-mount footprint optimized for space-constrained 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. |
| Power Supply | 3.3V core (SIO block 5V tolerant) - simplifies power rail design while maintaining compatibility with legacy 5V peripheral signaling. |
Pinout & Package
144-ball WFBGA package with 0.5 mm pitch and exposed thermal pad; ball grid layout defined in DS00002121B, Table 2-1. Pin functions depend on STRAPOPT strap (VTR = 0x7F device ID; VSS = 0x7D), affecting GPIO mapping and IDE/PCI reset availability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| K13 | STRAPOPT | Selects between SCH3114/SCH3116 legacy mode; determines Device ID (0x7F/0x7D) and enables/disables IDE/PCI reset outputs. |
| J1–J3, K1–K3, L1–L3, M1–M3, N1–N3 | LPC Interface (LAD0–LAD3, LFRAME#, LDRQ#) | Primary host communication bus; requires pull-up/pull-down per LPC spec for proper initialization and burst timing. |
| H1, G1, G2 | PCI_RESET#, PCI_CLK, SER_IRQ | Direct integration into PCI subsystem: synchronous reset assertion, clock distribution, and serialized interrupt aggregation. |
| A1–C2, A4–C4 | Thermal Diode Inputs (REMOTE1±, REMOTE2±) | Differential analog inputs for external CPU/GPU temperature sensing using thermal diode bias current (10 µA typical). |
| A4–C6, B4–C5 | FAN Control (PWM1–3, FANTACH1–3) | Three independent PWM outputs drive external fan MOSFETs; tachometer inputs accept TTL/CMOS pulse trains for closed-loop speed regulation. |
| A5, B6 | nHWM_INT, nTHERMTRIP | Open-drain interrupt outputs: nHWM_INT signals any out-of-limit voltage/temp/fan condition; nTHERMTRIP asserts hard thermal shutdown pulse. |
Key Features
| Feature | Design Value |
|---|---|
| 4-port NS16C550A UART with 16-byte FIFO | Enables 1.5 Mbps serial throughput per port with minimal CPU intervention; supports RS485 auto-direction control for half-duplex industrial networks. |
| Hardware Monitor with Programmable Fan Control | Automatically adjusts fan speeds based on real-time temperature/voltage thresholds - eliminates need for external thermal management ICs. |
| 8042 Keyboard Controller with 2 KB ROM | Provides full BIOS-level keyboard/mouse emulation including Fast Gate A20, KRESET, and Phoenix-compatible firmware - no external microcontroller required. |
| Security Key Register (32-byte) | Stores device-authentication keys for secure boot or firmware validation - accessible only via protected configuration space, not standard LPC I/O ports. |
| Strap-Selectable IDE/PCI Reset Outputs | Two configuration modes: IDE reset + 3× PCI resets (STRAPOPT=1) or two additional 4-pin serial ports (STRAPOPT=0) - enables single-BOM flexibility across platform variants. |
Applications
| Industrial Motherboard Power Management | Legacy PC Platform Serial Expansion |
|---|---|
|
Use Scenario: Embedded industrial PC requiring ACPI-compliant sleep/wake, thermal throttling, and multi-rail voltage supervision. IC Role / Device Role / Timing Role: Central Super I/O hub managing LPC-based host communication, hardware monitoring interrupts, and SMI-triggered power state transitions. Use Value: Reduces BOM count by integrating keyboard controller, watchdog, clock output, and reset generation - eliminating discrete glue logic and reducing PCB layer count. |
Use Scenario: Retrofitting legacy ISA/PCI systems with additional RS232/RS485 interfaces for PLC connectivity or barcode scanner integration. IC Role / Device Role / Timing Role: UART subsystem controller providing four independent serial channels with hardware flow control and 16-byte FIFO buffering. Use Value: Enables concurrent high-speed serial communication at up to 1.5 Mbps per port without CPU polling - critical for deterministic industrial data acquisition. |
| Embedded System Health Monitoring | Secure Boot-Enabled Industrial Gateway |
|
Use Scenario: Fan-cooled edge gateway monitoring CPU core voltage (+12V, +5V, Vccp), ambient temperature, and two remote thermal diodes. IC Role / Device Role / Timing Role: Real-time analog sensor aggregator with programmable limit comparison and automatic PWM fan response. Use Value: Prevents thermal runaway via nTHERMTRIP hard shutdown and provides early warning via nHWM_INT - meeting IEC 61508 functional safety requirements. |
Use Scenario: Secure industrial gateway requiring tamper-resistant device authentication during UEFI firmware verification. IC Role / Device Role / Timing Role: Trusted key storage element accessed only through protected configuration space during pre-boot sequence. Use Value: Provides 32-byte write-once security key register - prevents unauthorized firmware updates without physical access to LPC configuration registers. |
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 |
|---|---|---|---|
| NCT5532D | 48-pin QFP package; lacks LPC interface, uses ISA bus; no hardware monitor or thermal diode support. | Targeted at cost-sensitive legacy designs without ACPI or fan control requirements. | Choose only if LPC compatibility and thermal monitoring are unnecessary and board space allows larger QFP footprint. |
| IT8786E | 128-pin LQFP; supports LPC but offers 6 UARTs, no strap-selectable IDE/PCI reset, and different GPIO count (128 vs. 40). | Used in modern ATX motherboards requiring higher serial port density and broader voltage monitoring range. | Select when needing >4 UARTs or compatibility with IT87-series BIOS drivers - not drop-in due to pinout and register map differences. |
Compared with NCT5532D and IT8786E, SCH3227-SZ-TR uniquely balances industrial-grade thermal monitoring, strap-configurable reset outputs, and compact 144-ball WFBGA packaging - making it optimal for space-constrained, safety-aware embedded platforms where legacy PC compatibility remains essential.
Availability
SCH3227-SZ-TR is available at Aetrix Electronics and suitable for industrial motherboards, embedded gateways, and legacy PC platform upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for SCH3227-SZ-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 SCH3227-SZ-TR belongs to Microchip's LPC Super I/O product line, designed specifically for x86-based embedded systems requiring ACPI-compliant power management, serial expansion, and integrated hardware monitoring in compact form factors.
FAQ
What is the function of the STRAPOPT pin on SCH3227-SZ-TR?
The STRAPOPT pin (Ball K13) selects between two operational modes: when tied to VTR, SCH3227-SZ-TR enables IDE/PCI reset outputs and reports Device ID 0x7F; when tied to VSS, it enables two additional 4-pin serial ports and reports Device ID 0x7D. This strap option determines both pin functionality and PnP enumeration behavior - SCH3227-SZ-TR must be configured before power-on and cannot be changed dynamically.
Does SCH3227-SZ-TR support IrDA 1.0 infrared communication?
Yes, SCH3227-SZ-TR includes a multiprotocol infrared interface compliant with IrDA 1.0, SHARP ASK IR, and other common protocols. It provides dedicated RXD2/IRRX2 and TXD2/IRTX2 pins (Balls H12/H13), supports 480 address options and up to 15 IRQ assignments, and operates independently of the four full-function UARTs - SCH3227-SZ-TR maintains full IrDA capability regardless of strap configuration.
How many thermal diode inputs does SCH3227-SZ-TR provide, and what is their accuracy?
SCH3227-SZ-TR provides two differential thermal diode inputs (REMOTE1± and REMOTE2±) for external temperature sensing, plus an internal ambient sensor. Remote measurements achieve ±1.5°C accuracy over the full −40°C to +85°C operating range, calibrated against the internal reference - SCH3227-SZ-TR uses these inputs to drive automatic fan control and generate nHWM_INT alerts when thresholds are exceeded.
Can SCH3227-SZ-TR replace older Super I/O chips like the SCH311x family?
Yes, SCH3227-SZ-TR is the designated next-generation replacement for the SCH311x family, maintaining register-level compatibility for keyboard controller, GPIO, and configuration space access. However, SCH3227-SZ-TR introduces new features including enhanced hardware monitoring, strap-selectable IDE/PCI reset outputs, and updated LPC timing - SCH3227-SZ-TR requires BIOS/firmware updates to leverage new capabilities but preserves backward compatibility for basic SIO functions.
What is the purpose of the Security Key Register in SCH3227-SZ-TR?
The 32-byte Security Key Register in SCH3227-SZ-TR provides tamper-resistant storage for device-authentication keys used during secure boot sequences. It resides in protected configuration space, accessible only after unlocking via specific register writes - SCH3227-SZ-TR prevents readback of stored keys and supports one-time programming to prevent unauthorized firmware modification, enhancing platform integrity in industrial deployments.
SCH3227-SZ-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 144-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:
- 144-WFBGA (9x9)
SCH3227-SZ-TR FAQ
1.How can I place an order for SCH3227-SZ-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3227-SZ-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 SCH3227-SZ-TR reliable?
The price and inventory of SCH3227-SZ-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH3227-SZ-TR is usually 5 days.
3.What payment methods are accepted for SCH3227-SZ-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3227-SZ-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3227-SZ-TR?
SCH3227-SZ-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3227-SZ-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 SCH3227-SZ-TR?
For technical support, including SCH3227-SZ-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3227-SZ-TR requirements.
6.How does Aetrix verify that SCH3227-SZ-TR is sourced from the original manufacturer or authorized distributors?
All SCH3227-SZ-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 SCH3227-SZ-TR meets industry standards.
7.What is the process for return or replacement of SCH3227-SZ-TR?
All SCH3227-SZ-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3227-SZ-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 SCH3227-SZ-TR part is unused and in its original packaging.
Return procedure for SCH3227-SZ-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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