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Microchip Technology SCH3116I-NU
- Part No.:
- SCH3116I-NU
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 128-TQFP
- Datasheet:
-
SCH3116I-NU.pdf
- Description:
- IC INTFACE SPECIALIZED 128VTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:179
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Product details
Overview
SCH3116I-NU from Microchip Technology is an industrial-grade LPC Super I/O controller integrating keyboard/mouse control, six serial ports (four full-function + two four-pin), IEEE 1284 EPP/ECP parallel port, 2.88MB floppy disk controller, infrared interface, hardware monitoring, and programmable clock output. It operates at 3.3V with 5V-tolerant SIO block and supports ACPI 2.0, PC99/PC2001, and ISA Plug-and-Play standards for legacy PC platform integration.
For engineers reviewing the SCH3116I-NU datasheet, SCH3116I-NU pinout, SCH3116I-NU application, or SCH3116I-NU equivalent, this device serves as a drop-in replacement for legacy motherboard glue logic in embedded industrial PCs, thin clients, and ruggedized computing systems requiring full Super I/O functionality with thermal/voltage supervision and secure boot support.
Technical Context
The SCH3116I-NU implements a unified LPC bus interface compliant with 19–33 MHz operation, directly replacing ISA-based Super I/O while maintaining register-level compatibility with 8042 keyboard controllers and NS16550 UARTs. Its hardware monitor block integrates three fan tachometer inputs, three PWM outputs, and analog sensing for +2.5V, +5V, +12V, Vccp, VCC, Vbat, and Vtr rails plus dual thermal diode inputs.
Legacy functional blocks include a licensed CMOS 765B floppy controller with 16-byte FIFO and vertical recording support, enhanced digital data separator supporting 250 kbps–2 Mbps data rates, and multiprotocol IrDA 1.0/SHARP ASK infrared interface-all accessible via standardized LPC configuration space and logical device enumeration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - Enables direct replacement of ISA-bus Super I/O in modern low-pin-count motherboard designs without bridge logic. |
| Serial Ports | 6 total: 4 × 8-pin NS16550-compatible UARTs + 2 × 4-pin UARTs - Supports multi-port industrial serial communication with shared IRQ capability and RS485 auto-direction control. |
| Floppy Controller | 2.88 MB CMOS 765B core with 16-byte FIFO - Provides full IBM PC/XT/AT software and register compatibility for legacy BIOS and OS support. |
| Hardware Monitor Inputs | 7 voltage channels (+2.5V, +5V, +12V, Vccp, VCC, Vbat, Vtr) + 3 temperature sensors (2 external thermal diodes + 1 internal ambient) - Enables comprehensive system health supervision with programmable limits and nHWM_INT alert signaling. |
| GPIO Count | 40 general-purpose I/O pins, including 6 VID-compatible inputs - Allows flexible board-level control, status indication, and processor voltage identification in x86-compatible platforms. |
| Package | 128-pin VTQFP (14×14×1.0 mm, 2 mm footprint) - RoHS-compliant surface-mount package optimized for high-density industrial PCB layouts with thermal reliability across –40°C to +85°C. |
| Security Feature | 32-byte Security Key Register - Supports device authentication during secure boot sequences and firmware validation workflows. |
Pinout & Package
128-pin Very Thin Quad Flat Package (VTQFP) with 0.4 mm pitch, 14 mm × 14 mm body, 1.0 mm height, and 2 mm footprint per Microchip DS00001730A-page 6. RoHS compliant and halogen-free per IEC61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LPC_CLK | LPC Interface Clock Input | Accepts 19–33 MHz system clock; synchronizes all LPC transactions including configuration, I/O, and memory-mapped accesses. |
| LPC_FRAME# | LPC Bus Frame Signal | Indicates start/end of LPC transaction cycle; required for proper timing alignment with host chipset LPC controller. |
| LPC_RST# | LPC Reset Input | Asynchronous reset input that clears internal registers and places device in known initialization state upon power-up or system fault. |
| nLPC_SERIRQ | Serialized IRQ Output | Drives shared interrupt line for PCI/ISA-compatible serialized IRQ delivery; supports up to 15 IRQ options across logical devices. |
| nHWM_INT | Hardware Monitor Alert Output | Open-drain active-low signal asserted when any monitored voltage, temperature, or fan speed exceeds programmed thresholds. |
| THERMTRIP# | Over-Temperature Shutdown Output | Active-low pulse output triggered on programmable over-temperature condition; used to force system reset or initiate emergency shutdown. |
| CLKOUT | Programmable Clock Output | Configurable to 16 Hz for RTC or other low-frequency timing functions; driven from internal oscillator with software-selectable divider. |
Key Features
| Feature | Design Value |
|---|---|
| ACPI 2.0 Compliance | Enables native OS power management (S0–S5 states), PME wake events, and SMI handling without custom ACPI tables or BIOS extensions. |
| NS16550 UART Compatibility | Full register and timing compatibility ensures drop-in replacement for legacy serial drivers and BIOS UART initialization code across Windows/Linux/Bare Metal. |
| IEEE 1284 EPP/ECP Parallel Port | Supports bidirectional data transfer at up to 2 MB/s with hardware handshaking; enables legacy printer, scanner, and industrial peripheral connectivity. |
| Enhanced Digital Data Separator | Programmable precompensation and multi-rate support (250 kbps–2 Mbps) ensure reliable floppy read/write across varying media conditions and drive types. |
| VID-Compatible GPIO | Six dedicated inputs decode processor voltage ID codes (VID4–VID0 + VRM_EN) for automatic core voltage configuration in x86 platforms. |
Applications
| Industrial Embedded PC | Thin Client Terminal |
|---|---|
Use Scenario: Fan-cooled, fanless, or convection-cooled industrial PCs deployed in factory automation, HMI panels, or transportation systems requiring long-term availability and wide temperature operation. IC Role / Device Role / Timing Role: Central Super I/O hub managing keyboard/mouse, serial peripherals, floppy boot, parallel I/O, and real-time hardware monitoring. Use Value: Eliminates discrete logic and multiple ICs by consolidating legacy I/O, reducing BOM count and PCB area while enabling full ACPI-compliant power management across –40°C to +85°C. |
Use Scenario: Low-power, compact thin clients running Windows IoT or Linux-based remote desktop agents in enterprise offices or education environments. IC Role / Device Role / Timing Role: System glue logic providing serial console access, USB-to-serial bridging support, secure boot key storage, and thermal throttling coordination. Use Value: Integrates security key register and hardware monitor to enforce secure boot chain integrity and prevent unauthorized firmware modification during deployment and field updates. |
| Ruggedized Medical Device | Legacy-Interface Industrial Gateway |
Use Scenario: Portable diagnostic equipment or bedside monitors requiring FDA-compliant design, ESD-hardened I/O, and fail-safe thermal shutdown. IC Role / Device Role / Timing Role: Safety-critical subsystem supervisor generating THERMTRIP# pulse on overtemperature and asserting nHWM_INT for voltage/fan fault reporting. Use Value: Dual thermal diode inputs enable precise measurement of CPU and power supply junction temperatures with ±1.5°C accuracy, meeting IEC 60601-1 thermal safety requirements. |
Use Scenario: Edge gateway connecting legacy RS232/RS485 field devices (PLCs, sensors, meters) to modern Ethernet/IP or MQTT networks. IC Role / Device Role / Timing Role: Multi-protocol serial interface controller with RS485 auto-direction control, IrDA infrared diagnostics, and parallel port for legacy firmware update interfaces. Use Value: Four full-function UARTs plus two 4-pin UARTs allow simultaneous connection to six independent serial field devices without external level shifters or direction-control logic. |
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 | 128-pin LQFP package; supports only 4 serial ports; lacks floppy controller and IDE reset outputs; no VID-compatible GPIOs. | Targeted at cost-sensitive consumer motherboards rather than industrial platforms requiring full legacy I/O and thermal supervision. | Choose IT8786E only if floppy, 6-port serial, and VID decoding are unnecessary and commercial temperature range suffices. |
| Nuvoton NCT6779D | 128-pin QFN; includes integrated fan controller with 6 PWM outputs; adds SMBus host interface but omits LPC serial IRQ support and floppy controller. | Optimized for modern server BMC and AI edge compute platforms where SMBus-based telemetry dominates over legacy LPC enumeration. | Select NCT6779D when advanced fan control and SMBus telemetry outweigh need for floppy, PS/2 keyboard, or serial IRQ sharing. |
Compared with IT8786E and NCT6779D, the SCH3116I-NU uniquely delivers full 6-port serial + floppy + parallel + IR + hardware monitor + security key in a single industrial-temperature VTQFP package with native LPC serial IRQ and ACPI 2.0 compliance-making it irreplaceable for legacy-dependent embedded PC designs.
Availability
SCH3116I-NU is available at Aetrix Electronics and suitable for industrial embedded PCs, thin client terminals, ruggedized medical devices, and legacy-interface industrial gateways requiring stable component supply, long lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SCH3116I-NU 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 components, and connectivity solutions, with a focus on embedded control and industrial reliability.
The SCH3116I-NU belongs to Microchip's LPC Super I/O product line, designed specifically to replace legacy ISA-bus Super I/O chips in x86-based industrial and embedded platforms while maintaining full software and hardware compatibility.
FAQ
What is the operating temperature range of the SCH3116I-NU?
The SCH3116I-NU is rated for industrial temperature operation from –40°C to +85°C, as confirmed by its "I" suffix in the part number and explicitly stated in Microchip DS00001730A-page 2. This range ensures reliable performance in uncontrolled environments such as factory floors, outdoor kiosks, and transportation systems where ambient conditions exceed commercial specifications.
Does the SCH3116I-NU include a floppy disk controller, and what standards does it support?
Yes, the SCH3116I-NU integrates a licensed CMOS 765B floppy disk controller supporting 2.88 MB capacity, vertical recording format, 16-byte FIFO, and 100% IBM PC/XT/AT software and register compatibility. It detects overrun/underrun conditions and includes sophisticated power control circuitry (PCC) with multiple powerdown modes for reduced power consumption.
How many serial ports does the SCH3116I-NU provide, and what are their configurations?
The SCH3116I-NU provides six serial ports: four full-function 8-pin NS16550-compatible UARTs and two 4-pin UARTs. All support baud rates up to 1.5 Mbps, programmable baud rate generation, RS485 auto-direction control, and IRQ sharing. The 4-pin variants offer selectable input/output controls for space-constrained designs.
Is the SCH3116I-NU compatible with ACPI 2.0 and PC99/PC2001 specifications?
Yes, the SCH3116I-NU is explicitly certified compliant with ACPI 2.0, PC99, and PC2001 standards per Microchip DS00001730A-page 1. This enables native OS power management, PME wake events, SMI handling, and plug-and-play enumeration without BIOS workarounds or custom ACPI table development.
What hardware monitoring capabilities does the SCH3116I-NU offer?
The SCH3116I-NU monitors seven voltage rails (+2.5V, +5V, +12V, Vccp, VCC, Vbat, Vtr), internal ambient temperature, and two external temperatures via thermal diodes (±1.5°C accuracy). It features three fan tachometer inputs, three PWM outputs, programmable limits, nHWM_INT alert signaling, and a dedicated THERMTRIP# output for overtemperature shutdown.
SCH3116I-NU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 128-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Controller
- Interface:
- LPC
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 128-VTQFP (14x14)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
SCH3116I-NU FAQ
1.How can I place an order for SCH3116I-NU through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3116I-NU 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 SCH3116I-NU reliable?
The price and inventory of SCH3116I-NU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH3116I-NU is usually 5 days.
3.What payment methods are accepted for SCH3116I-NU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3116I-NU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3116I-NU?
SCH3116I-NU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3116I-NU 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 SCH3116I-NU?
For technical support, including SCH3116I-NU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3116I-NU requirements.
6.How does Aetrix verify that SCH3116I-NU is sourced from the original manufacturer or authorized distributors?
All SCH3116I-NU 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 SCH3116I-NU meets industry standards.
7.What is the process for return or replacement of SCH3116I-NU?
All SCH3116I-NU units undergo pre-shipment inspection (PSI). If there is an issue with SCH3116I-NU, 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 SCH3116I-NU part is unused and in its original packaging.
Return procedure for SCH3116I-NU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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