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Microchip Technology SCH5027D-NW
- Part No.:
- SCH5027D-NW
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 128-BFQFP
- Datasheet:
-
SCH5027D-NW.pdf
- Description:
- IC INTERFACE SPECIALIZED 128QFP
- Quantity:
- Payment:
- Shipping:
Inventory:146
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Product details
Overview
SCH5027D-NW from Microchip Technology is a 128-pin QFP Super I/O controller with LPC interface, integrated hardware monitoring (PECI temperature sensing, 6 fan tach inputs, 5 PWM outputs), and motherboard glue logic including PCI reset buffers and SMBus isolation. It operates at 3.3V (SIO block 5V-tolerant), supports ACPI 2.0 and PC2001 compliance, and targets legacy-compatible industrial and embedded PC motherboards requiring consolidated I/O, thermal management, and power sequencing.
For engineers reviewing the SCH5027D-NW datasheet, SCH5027D-NW pinout, SCH5027D-NW application, or SCH5027D-NW equivalent, this device serves as a full-featured replacement for legacy 82077AA-based Super I/Os in systems needing PECI processor temperature monitoring, quiet multi-fan control, and integrated IDE/PCI reset logic without external glue components.
Technical Context
The SCH5027D-NW integrates a licensed CMOS 765B floppy disk controller with 16-byte FIFO and vertical recording support, two NS16C550A-compatible UARTs with 16-byte FIFOs and IrDA 1.0 infrared capability, and an 8042 software-compatible keyboard/mouse controller with 2 kB ROM and 256 B RAM. Its LPC interface implements multiplexed command/address/data bus and serialized IRQ support per PCI specification.
Hardware monitoring is implemented via dedicated analog front-end with four voltage inputs (1.125V ×2, 5V, 2.25V for Vccp), dual remote thermal diode interfaces, internal ambient sensor, and configurable offset correction. All monitored channels feed limit comparators that drive nHWM_INT and generate PME events, accessible over SMBus 2.0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Interface | Standard Low Pin Count bus compliant with Intel specification; enables direct connection to chipset southbridge without ISA bus. |
| Operating Voltage | 3.3V core supply with 5V-tolerant SIO block; eliminates level-shifting for legacy peripheral signals. |
| Floppy Controller | CMOS 765B core with 100% IBM PC/AT compatibility, 16-byte FIFO, and programmable precompensation for reliable 2.88 MB FDD operation. |
| Fan Control | 5 independent PWM outputs + 6 tachometer inputs; supports two/three-piece linear fan curves and automatic speed adjustment based on PECI or thermal diode readings. |
| Temperature Sensing | Internal ambient sensor + two remote thermal diode inputs + PECI interface for CPU die temperature; all channels support user-configurable limits and offset correction. |
| Package | 128-pin QFP (14 mm × 20 mm × 2.7 mm body, 3.2 mm footprint); RoHS-compliant surface-mount package suitable for high-density motherboard layouts. |
| Compliance | ACPI 2.0, PC99/PC2001, ISA Plug-and-Play v1.0a, SMBus 2.0, IrDA 1.0, IEEE 1284 EPP/ECP - ensures interoperability with standard BIOS and OS power management stacks. |
Pinout & Package
128-pin QFP (NW suffix), RoHS-compliant, 14 mm × 20 mm body with 0.4 mm lead pitch. Pin functions include LPC bus signals (LAD[3:0], LFRAME#, LDRQ#), hardware monitoring analog inputs (V1_IN, V2_IN, VCCP_IN, Remote1±, Remote2±), PWM outputs (PWM1–PWM3, PWMA, PWMB), fan tach inputs (FANTACH1–FANTACH4, FANTACHA/B), PECI interface (PECI, READY), SMBus pins (SDA, SCLK, SDA1, SCLK1, SDA2, SCLK2), and motherboard glue logic outputs (nPCIRST_OUT[1:4], nIDE_RSTDRV, nRSMRST).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD[3:0] | LPC Address/Data Bus | Multiplexed 4-bit bidirectional bus carrying configuration addresses, data, and commands between southbridge and SCH5027D-NW. |
| nHWM_INT | Hardware Monitoring Interrupt | Open-drain active-low output signaling out-of-limit conditions across temperature, voltage, or fan tach channels; also triggers PME and speaker alarm. |
| PWM1–PWM3 | Pulse Width Modulation Outputs | Dedicated fan speed control outputs supporting low/high frequency PWM; each drives one cooling fan with programmable duty cycle and frequency. |
| FANTACH1–FANTACH4 | Fan Tachometer Inputs | Four of six tachometer inputs accepting TTL-level pulse trains from fan rotation sensors; used for closed-loop fan speed feedback and fault detection. |
| PECI / READY | Platform Environment Control Interface | Dedicated 2-wire PECI bus interface enabling direct readout of CPU die temperature; READY signal synchronizes PECI transactions with host timing. |
| nPCIRST_OUT[1:4] | Buffered PCI Reset Outputs | Four software-controllable reset outputs for PCI devices; default transparent mode allows pass-through of chipset reset signal during boot. |
Key Features
| Feature | Design Value |
|---|---|
| ChiProtect™ Parallel Port | Integrated ESD protection circuitry on IEEE 1284 EPP/ECP port pins prevents latch-up and damage during hot-plug or cable insertion events. |
| Quiet Auto Fan Control | Programmable two/three-piece linear fan curves using temperature thresholds and hysteresis eliminate audible fan noise spikes during thermal transients. |
| Enhanced Digital Data Separator | Dedicated analog front-end in floppy controller improves read margin and reduces bit error rate on high-density 2.88 MB floppy media under marginal signal conditions. |
| Security Key Register | 32-byte write-once register for storing device authentication keys; supports secure boot verification and firmware integrity checks in trusted platform designs. |
| VID Inputs | Three VID pins (VID3–VID5) enable dynamic core voltage identification from CPU; used by hardware monitoring block to scale Vccp voltage measurements accurately. |
Applications
| Industrial Embedded PC | Legacy-Compatible Server Board |
|---|---|
|
Use Scenario: Fan-cooled x86-based industrial controller running real-time Linux with strict thermal envelope requirements. IC Role / Device Role / Timing Role: Central Super I/O managing floppy boot, serial console, parallel printer interface, keyboard/mouse, and closed-loop fan control via PECI and thermal diodes. Use Value: Eliminates need for discrete fan controllers and voltage supervisors; single-chip integration reduces BOM count and PCB area while enabling silent operation below 60°C ambient. |
Use Scenario: Rack-mounted server motherboard requiring BIOS-compatible floppy boot, dual serial debug ports, and hardware-monitored cooling for dual-socket Xeon processors. IC Role / Device Role / Timing Role: Legacy I/O hub providing 8042 keyboard/mouse, two 16C550A UARTs, ECP parallel port, and PECI-based CPU temperature telemetry to BMC. Use Value: Enables full ACPI 2.0 power state transitions (S3/S5) with accurate thermal shutdown and PME-driven wake-on-fan-failure, meeting enterprise reliability SLAs. |
| Medical Diagnostic Workstation | Retail Point-of-Sale Terminal |
|
Use Scenario: Fanless medical imaging workstation with passive heatsink, requiring precise ambient and component temperature monitoring for FDA compliance reporting. IC Role / Device Role / Timing Role: Hardware monitor collecting internal ambient, remote board sensor, and PECI CPU die temperatures; logs min/max values and triggers alerts on threshold breach. Use Value: Provides traceable, calibrated thermal data across three independent channels with configurable offsets-meets IEC 62304 software safety classification requirements. |
Use Scenario: Compact POS terminal with integrated receipt printer, barcode scanner, and cash drawer, deployed in retail environments with variable ambient temperatures. IC Role / Device Role / Timing Role: Multi-mode parallel port driver with ChiProtect™ for receipt printer, plus voltage monitoring of 5V rail and battery-backed RTC supply (Vbat). Use Value: Prevents print failures due to ESD-induced latch-up; continuous Vbat monitoring ensures uninterrupted clock operation during main power loss, preserving transaction timestamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Super I/O with hardware monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W83627DHG-P | Supports LPC interface and hardware monitoring but lacks PECI; uses thermal diodes only; no floppy controller. | Targeted at modern embedded systems where floppy boot is obsolete and PECI is not required for CPU temperature. | Select when PECI integration and floppy support are unnecessary, and cost-sensitive volume production favors Winbond's broader distribution. |
| Nuvoton NCT6776F | Includes PECI and hardware monitoring, but no floppy controller or ChiProtect™; offers higher-resolution ADC (12-bit vs 10-bit) and more GPIOs (112 vs 25). | Preferred for new designs requiring advanced thermal profiling and GPIO expansion, especially in cloud infrastructure platforms. | Choose when migrating from legacy architectures and prioritizing future-proofing over backward compatibility with floppy or PS/2 peripherals. |
Compared with SCH5027D-NW, W83627DHG-P omits PECI and floppy functionality-reducing feature set but improving supply chain availability-while NCT6776F extends monitoring resolution and GPIO count at the expense of legacy interface support, making it unsuitable for drop-in replacement in existing PC/AT-form-factor designs.
Availability
SCH5027D-NW is available at Aetrix Electronics and suitable for industrial embedded PCs, legacy server boards, medical diagnostic workstations, and retail point-of-sale terminals requiring stable component supply across extended product lifecycles.
Supply support for SCH5027D-NW 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 headquarters in Chandler, Arizona.
The SCH5027D-NW belongs to Microchip's Super I/O product line, designed to consolidate legacy PC peripheral interfaces, hardware monitoring, and motherboard glue logic into a single RoHS-compliant IC for industrial and embedded x86 platforms.
FAQ
What is the primary function of the SCH5027D-NW in a system architecture?
The SCH5027D-NW serves as a fully integrated Super I/O controller that consolidates legacy PC peripherals-including floppy disk, dual serial ports, infrared, parallel port, and keyboard/mouse-alongside hardware monitoring (PECI, thermal diodes, voltage, fan control) and motherboard glue logic (PCI reset, IDE reset, SMBus isolation). In system architecture, it replaces multiple discrete components, reducing BOM count and simplifying layout while maintaining full BIOS and OS compatibility. The SCH5027D-NW is essential for x86-based industrial and embedded motherboards requiring long-term support and backward compatibility.
Does the SCH5027D-NW support PECI for CPU temperature monitoring?
Yes, the SCH5027D-NW includes a dedicated PECI interface (PECI and READY pins) for direct communication with Intel-compatible CPUs to read die temperature. This capability is explicitly documented in the datasheet and complements its two remote thermal diode inputs and internal ambient sensor. The PECI channel feeds into the same hardware monitoring engine that generates nHWM_INT interrupts and PME events, enabling coordinated thermal management across CPU, chipset, and board-level components. The SCH5027D-NW processes PECI data without host CPU intervention, making it suitable for real-time thermal throttling and logging.
How many fan control outputs and tachometer inputs does the SCH5027D-NW provide?
The SCH5027D-NW provides five PWM outputs (PWM1–PWM3, PWMA, PWMB) and six fan tachometer inputs (FANTACH1–FANTACH4, FANTACHA, FANTACHB). These support quiet auto-fan control using two- or three-piece linear fan curves, with programmable thresholds and hysteresis. Each tach input accepts TTL-level pulses for RPM measurement, and out-of-limit events trigger both nHWM_INT and PME signals. The SCH5027D-NW's fan control subsystem is fully configurable via SMBus or LPC configuration space, enabling precise thermal response without firmware overhead.
Is the SCH5027D-NW compatible with ACPI 2.0 and PC2001 standards?
Yes, the SCH5027D-NW is explicitly certified compliant with ACPI 2.0 and PC2001 specifications, as confirmed in the official Microchip datasheet (DS00001782A). This compliance enables full support for S0–S5 power states, system management interrupt (SMI) generation, PME signaling, and standardized hardware monitoring event handling within Windows and Linux power management frameworks. The SCH5027D-NW implements required registers, control logic, and wakeup event routing to meet these standards without requiring custom BIOS extensions.
What package type and pin count does the SCH5027D-NW use?
The SCH5027D-NW uses a 128-pin QFP package (designated "NW" in the part number), measuring 14 mm × 20 mm × 2.7 mm with a 3.2 mm footprint and 0.4 mm lead pitch. It is RoHS-compliant and optimized for surface-mount assembly on high-density motherboards. The pinout includes dedicated LPC interface signals, analog monitoring inputs, PWM/fan tach pins, PECI interface, SMBus channels, and motherboard glue logic outputs such as nPCIRST_OUT[1:4] and nIDE_RSTDRV. This package is consistent across all SCH5027D-NW units and verified in Microchip's official package outline (Figure 2, DS00001782A).
SCH5027D-NW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 128-BFQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- -
- Interface:
- LPC
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 128-QFP (14x20)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
SCH5027D-NW FAQ
1.How can I place an order for SCH5027D-NW through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH5027D-NW 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 SCH5027D-NW reliable?
The price and inventory of SCH5027D-NW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH5027D-NW is usually 5 days.
3.What payment methods are accepted for SCH5027D-NW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH5027D-NW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH5027D-NW?
SCH5027D-NW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH5027D-NW 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 SCH5027D-NW?
For technical support, including SCH5027D-NW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH5027D-NW requirements.
6.How does Aetrix verify that SCH5027D-NW is sourced from the original manufacturer or authorized distributors?
All SCH5027D-NW 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 SCH5027D-NW meets industry standards.
7.What is the process for return or replacement of SCH5027D-NW?
All SCH5027D-NW units undergo pre-shipment inspection (PSI). If there is an issue with SCH5027D-NW, 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 SCH5027D-NW part is unused and in its original packaging.
Return procedure for SCH5027D-NW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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