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Microchip Technology SCH3227-SZ
- Part No.:
- SCH3227-SZ
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 144-WFBGA
- Datasheet:
-
SCH3227-SZ.pdf
- Description:
- IC CTLR IO LPC MULT PORT 144BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
SCH3227-SZ from Microchip Technology is a 3.3V LPC Super I/O controller with 5V-tolerant SIO block, integrated 8042 keyboard/mouse controller, four full NS16C550A-compatible UARTs (16-byte FIFOs, up to 1.5 Mbps), IEEE 1284 EPP/ECP parallel port, IrDA 1.0 infrared interface, hardware monitoring (voltage/temperature/fan), and programmable clock output (16 Hz). It serves as motherboard glue logic in industrial PC and embedded x86 platforms requiring legacy I/O consolidation.
For engineers reviewing the SCH3227-SZ datasheet, SCH3227-SZ pinout, SCH3227-SZ application, or SCH3227-SZ equivalent, key selection criteria include LPC bus compliance (19–33 MHz), strap-configurable IDE/PCI reset outputs, 40 GPIOs (6 VID-capable), hardware monitor interrupt (nHWM_INT), and WFBGA-144 packaging for space-constrained designs.
Technical Context
The SCH3227-SZ implements an LPC interface compliant with Intel Low Pin Count Specification Rev 1.0, supporting serialized IRQ and SMI signaling over LAD[3:0] and LFRAME#. Its 8042-compatible keyboard controller includes 2 kB ROM, 256 B RAM, and dedicated open-drain outputs for PS/2 keyboard/mouse.
Hardware monitoring integrates three fan tachometer inputs, three PWM fan control outputs, dual thermal diode inputs (±1.5°C accuracy), internal ambient sensor, and voltage monitoring for +2.5V, +5V, +12V, Vccp, VCC, Vbat, and Vtr. The nHWM_INT pin asserts on out-of-limit conditions, while THERMTRIP provides independent over-temperature pulse output.
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 BIOS initialization. |
| UART Count & Type | 4 × full NS16C550A-compatible ports - enables simultaneous RS232/RS485 serial communication with 16-byte FIFO buffering per channel. |
| Max UART Baud Rate | 1.5 Mbps - supports high-speed industrial telemetry, modem, and point-of-sale peripheral interfaces. |
| GPIO Count | 40 pins - provides flexible system-level control for LEDs, buttons, status indicators, and custom logic in embedded motherboards. |
| Hardware Monitor Inputs | +2.5V, +5V, +12V, Vccp, VCC, Vbat, Vtr, REMOTE1±, REMOTE2± - enables comprehensive power rail and thermal validation across CPU, memory, and peripherals. |
| Package | WFBGA-144 - 8 mm × 8 mm, 0.5 mm pitch, RoHS-compliant package optimized for compact x86 motherboard layouts. |
| Operating Temperature | −40°C to +85°C (industrial grade) - ensures reliable operation in uncontrolled environments such as factory automation and transportation systems. |
Pinout & Package
Package: 144-ball WFBGA (8 mm × 8 mm, 0.5 mm pitch), RoHS-compliant, with ball pitch and mechanical outline per Microchip DS00002121B-page 281.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD[3:0] | LPC Data Bus | Time-multiplexed bidirectional data lines for configuration and runtime I/O access via LPC host. |
| LFRAME# | LPC Frame Signal | Indicates start/end of LPC transaction cycle; synchronizes address/data phases with host. |
| LDRQ# | LPC DMA Request | Asserted by SCH3227-SZ to request DMA service from LPC host for high-bandwidth UART/parallel transfers. |
| nHWM_INT | Hardware Monitor Interrupt | Active-low open-drain output signaling voltage/temperature/fan fault; triggers PME or SMI event. |
| nTHERMTRIP | Over-Temperature Pulse Output | Dedicated hardware shutdown signal asserting pulse on programmed thermal threshold breach. |
| PWM1–PWM3 | Fan Speed Control Outputs | Three independent PWM outputs driving external fan drivers for closed-loop thermal management. |
| FANTACH1–FANTACH3 | Fan Tachometer Inputs | Three digital inputs measuring fan RPM via pulse counting; used for speed verification and fail-safe detection. |
| REMOTE1± / REMOTE2± | Thermal Diode Inputs | Differential analog inputs for remote temperature sensing of CPU/die or GPU using external diode-connected transistors. |
Key Features
| Feature | Design Value |
|---|---|
| Strap-Configurable IDE/PCI Reset Outputs | Two 4-pin serial ports or three PCI reset buffers (nPCIRST1–3) selectable via STRAPOPT pin - enables flexible board-level reset architecture without firmware reconfiguration. |
| NS16C550A-Compatible UARTs with RS485 Auto Direction | Hardware-controlled RTS assertion during TX buffer load/empty - eliminates external direction-control logic in half-duplex RS485 networks. |
| IEEE 1284 EPP/ECP Parallel Port with ChiProtect™ | ESD-hardened bi-directional parallel interface supporting legacy printers, scanners, and FPGA programming jigs with robust ±8 kV HBM protection. |
| Security Key Register (32-byte) | Non-volatile storage for device authentication keys - enables secure boot chain integration and platform identity binding in OEM firmware. |
| Programmable Clock Output (16 Hz) | Low-frequency clock source for real-time clock (RTC) backup or watchdog timer reference - reduces need for external timing components. |
Applications
| Industrial PC Motherboard | Embedded x86 Gateway |
|---|---|
|
Use Scenario: Consolidating legacy I/O (keyboard, serial, parallel, IR) on a fanless DIN-rail mounted controller running Linux-based SCADA software. IC Role / Device Role / Timing Role: Central Super I/O hub managing PS/2 keyboard/mouse, four RS232 ports for PLC connectivity, EPP parallel port for legacy barcode scanner, and hardware monitoring for thermal safety. Use Value: Reduces BOM count by replacing discrete UARTs, parallel controllers, and thermal sensors while enabling ACPI-compliant power states and secure boot via 32-byte security key register. |
Use Scenario: Edge gateway aggregating Modbus RTU data from field devices and forwarding via Ethernet, deployed in oil & gas remote telemetry sites. IC Role / Device Role / Timing Role: System-level I/O manager providing two full UARTs for Modbus master/slave, one IR port for local diagnostics, and hardware monitoring for ambient and processor die temperature. Use Value: Enables -40°C to +85°C operation with automatic fan control and out-of-limit alerts (nHWM_INT), eliminating need for external thermal management ICs. |
| Medical Diagnostic Equipment | Ruggedized Point-of-Sale Terminal |
|
Use Scenario: Portable ultrasound machine requiring FDA-compliant power sequencing, battery-backed security key, and multiple serial interfaces for probe calibration and printer output. IC Role / Device Role / Timing Role: Power control and I/O coordinator generating PWRGD_PS/PWRGD_OUT signals, managing IDE reset for internal SSD, and providing four UARTs for probe communication and service logging. Use Value: Integrates resume power good generation, watchdog timer, and battery-backed 32-byte security key register - satisfies IEC 62304 traceability and secure update requirements. |
Use Scenario: Retail kiosk with PS/2 keyboard, receipt printer (parallel), magnetic stripe reader (RS232), and thermal printer (RS485), operating 24/7 in retail store environments. IC Role / Device Role / Timing Role: Multi-interface bridge delivering ECP parallel port for receipt printing, RS485 auto-direction UART for thermal printer, and hardware monitoring for ambient temperature-triggered fan activation. Use Value: Eliminates external RS485 transceiver direction logic and discrete thermal sensor, reducing failure points and enabling predictive maintenance via fan tachometer feedback. |
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 |
|---|---|---|---|
| ITE IT8786E-S | 128-pin QFP package; lacks strap-configurable IDE/PCI reset outputs; only 2 full UARTs; no ChiProtect™ parallel port. | Better suited for cost-sensitive consumer motherboards where WFBGA footprint and industrial temp range are not required. | Select SCH3227-SZ when WFBGA-144, industrial temperature, or configurable reset outputs are mandatory. |
| Nuvoton NCT6776D | 128-pin QFP; supports 6 UARTs but no IrDA; hardware monitor lacks REMOTE2± inputs; no 32-byte security key register. | Preferred for high-UART-count server management controllers where security key storage and dual thermal diode inputs are secondary. | Choose SCH3227-SZ for medical/industrial use cases requiring battery-backed security key, dual remote thermal sensing, and ChiProtect™ ECP parallel port. |
Compared with ITE IT8786E-S and Nuvoton NCT6776D, the SCH3227-SZ uniquely combines WFBGA-144 packaging, strap-selectable IDE/PCI reset outputs, ChiProtect™ ECP parallel port, and battery-backed 32-byte security key - making it optimal for space-constrained, security-aware, and thermally demanding embedded x86 platforms.
Availability
SCH3227-SZ is available at Aetrix Electronics and suitable for industrial PC motherboard design, embedded x86 gateway development, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SCH3227-SZ 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 belongs to Microchip's LPC Super I/O product line, designed specifically to consolidate legacy PC I/O functions (keyboard, serial, parallel, IR, hardware monitoring) into a single low-power, ACPI-compliant device for modern embedded x86 platforms.
FAQ
What is the function of the STRAPOPT pin on the SCH3227-SZ?
The STRAPOPT pin on the SCH3227-SZ selects between two functional configurations: when tied to VTR, it enables IDE/PCI reset outputs and sets Device ID = 0x7F; when tied to VSS, it enables two additional 4-pin serial ports and sets Device ID = 0x7D. This strapping option determines both pin functionality and Plug-and-Play enumeration behavior, and must be hard-wired before power-up.
Does the SCH3227-SZ support RS485 auto-direction control?
Yes, the SCH3227-SZ supports RS485 auto-direction control on its UARTs. When enabled, the nRTS signal is automatically driven low when the transmit FIFO loads and high when empty - eliminating external direction-control logic. This feature is implemented per UART and configured via hardware registers in the runtime configuration space.
How many thermal diode inputs does the SCH3227-SZ provide, and what is their accuracy?
The SCH3227-SZ provides two differential thermal diode inputs (REMOTE1± and REMOTE2±) for external temperature sensing, with measurement accuracy of ±1.5°C. These inputs support standard diode-connected transistors (e.g., 2N3904) placed near CPU or GPU dies, and are used alongside the internal ambient sensor for multi-point thermal management.
What is the purpose of the 32-byte Security Key Register in the SCH3227-SZ?
The 32-byte Security Key Register in the SCH3227-SZ is battery-backed and non-volatile, intended for storing cryptographic keys, platform identifiers, or secure boot seeds. It is accessible only via LPC configuration space and protected against unauthorized read/write - enabling OEMs to implement device authentication, firmware signing, and anti-cloning mechanisms in certified medical or industrial systems.
Can the SCH3227-SZ generate a reset pulse independently of the host processor?
Yes, the SCH3227-SZ includes a programmable watchdog timer that can generate a reset pulse independently of the host processor. The pulse width is selectable via external strapping, and the watchdog can be triggered by software timeout or hardware events such as nHWM_INT assertion. This enables fail-safe recovery in headless embedded systems without CPU intervention.
SCH3227-SZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 144-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:
- 40
- Voltage - Supply:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-WFBGA (9x9)
SCH3227-SZ FAQ
1.How can I place an order for SCH3227-SZ through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3227-SZ 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 reliable?
The price and inventory of SCH3227-SZ 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 is usually 5 days.
3.What payment methods are accepted for SCH3227-SZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3227-SZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3227-SZ?
SCH3227-SZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3227-SZ 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?
For technical support, including SCH3227-SZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3227-SZ requirements.
6.How does Aetrix verify that SCH3227-SZ is sourced from the original manufacturer or authorized distributors?
All SCH3227-SZ 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 meets industry standards.
7.What is the process for return or replacement of SCH3227-SZ?
All SCH3227-SZ units undergo pre-shipment inspection (PSI). If there is an issue with SCH3227-SZ, 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 part is unused and in its original packaging.
Return procedure for SCH3227-SZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SCH3227-SZ Tags
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