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Microchip Technology SCH3221-7U-TR
- Part No.:
- SCH3221-7U-TR
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 64-WFBGA
- Datasheet:
-
SCH3221-7U-TR.pdf
- Description:
- IC INTFACE SPECIALIZED 64WFBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SCH3221-7U-TR from Microchip Technology is a 3.3V (5V-tolerant) LPC-based Super I/O controller IC designed for PC99/PC2001-compliant embedded and industrial motherboards. It integrates four NS16550-compatible UARTs with 16-byte FIFOs, dual IR ports supporting IrDA v1.2 (4 Mbps), 33 GPIOs, two LED drivers, watchdog timer, and programmable wake-up logic via PME/SMI. It serves as the primary I/O hub for legacy serial, infrared, and system management functions in low-power x86 platforms.
For engineers reviewing the SCH3221-7U-TR datasheet, SCH3221-7U-TR pinout, SCH3221-7U-TR application, or SCH3221-7U-TR equivalent, key selection considerations include LPC bus compatibility, 460 kbps UART throughput, VTR-powered wake-from-sleep capability, 64-ball WFBGA package constraints, and AC'97/ACPI-compliant power management signaling.
Technical Context
The SCH3221-7U-TR implements a Low Pin Count (LPC) host interface compliant with Intel LPC Specification Rev 1.0, using PCI 3.3V signaling on LAD[3:0], LFRAME#, LDRQ#, and LPCPD#. Its runtime register block and configuration registers are accessible via I/O-mapped port cycles, with base addresses configurable through CR registers.
It features dual power domains: VCC (3.3V main supply) powers UARTs, GPIOs, and LPC interface logic, while VTR (3.3V standby supply) sustains PME wakeup logic, WDT, LED2, CLKI32 input, and runtime registers during VCC removal. Wake events include UART RI inputs (nRI1–nRI4), GPIOs (GP11–GP13, GP16–GP17, GP20–GP23, GP30–GP37, GP40, GP50), and watchdog timeout - all asserted via open-drain IO_PME# output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V nominal VCC; 5V-tolerant on non-LPC pins; VTR required for wake-from-sleep operation |
| UART Count & Type | 4 × NS16550A-compatible UARTs with 16-byte TX/RX FIFOs; supports up to 460 kbps baud rate |
| Infrared Support | Dual IR ports: IrDA v1.2 (4 Mbps), HPSIR, ASKIR, Consumer IR; includes IRTX2/IRRX2 and IRTX3/IRRX3 paths |
| GPIO Count | 33 general-purpose I/O pins with VCC- or VTR-powered buffers; 22 support PME wakeup under VTR-only mode |
| LPC Interface | Compliant with Intel LPC Spec Rev 1.0; supports Serial IRQ, ACPI SMI, and PME/SCI signaling |
| Package | 64-ball WFBGA (5.0 mm × 5.0 mm × 0.65 mm); RoHS-compliant; ball pitch 0.5 mm |
| Operating Temperature | Industrial grade: –40°C to +85°C ambient; validated across full VCC/VTR voltage and timing margins |
Pinout & Package
64-ball WFBGA package with 0.5 mm pitch; top-side ball layout per DS00002120A-page 7–9. Ball assignments include dedicated LPC signals (LAD0–LAD3, LFRAME#, LDRQ#), UART I/O (TXD1–TXD4, RXD1–RXD4, nRTS/nCTS/nDTR/nRI/nDCD), IR functions (IRTX2, IRRX2, IRMODE, IRRX3), dual LED drivers (nLED1, nLED2), and 33 GPIOs with multifunction capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GP11 | General Purpose I/O / Wake Input | VCC-powered GPIO with VTR-wakeup input buffer; usable as PME source when configured as input |
| GP21 / IRTX2 / WDT | IR Transmit / Watchdog Output | Tristate on VCC POR; drives IRTX2 signal only after UART2 power bit enabled; doubles as WDT reset output |
| GP23 / nLED2 / IRQIN2 | LED Driver / IRQ Input | VTR-powered output enables LED2 blink control during standby; also serves as interrupt input source |
| IO_PME# | Power Management Event Output | Open-drain VTR-powered output asserted low on any enabled wake event (RI, GPIO, WDT) |
| LAD0–LAD3 | LPC Multiplexed Address/Data | PCI 3.3V-compliant bidirectional bus lines; carry command, address, and data during LPC cycles |
Key Features
| Feature | Design Value |
|---|---|
| Four Full-Function UARTs | NS16550A-compatible with 16-byte FIFOs, hardware flow control (nRTS/nCTS), modem signals (nDTR/nDSR/nRI/nDCD), and 460 kbps max baud |
| Dual IR Communication Ports | Supports IrDA v1.2 (4 Mbps), HPSIR, ASKIR, and Consumer IR protocols; separate IRTX2/IRRX2 and IRTX3/IRRX3 paths |
| VTR-Powered Wake Logic | Enables wake-from-sleep via UART RI inputs, 22 GPIOs, or watchdog timeout while VCC is off - sustained by 3.3V VTR supply |
| ACPI & PC99 Compliance | Fully supports ACPI SMI generation, PME/SCI signaling, Serial IRQ, and PC99/PC2001 system integration requirements |
| Configurable LED Drivers | Two independent LED outputs: nLED1 (VCC-powered) for active-state indication; nLED2 (VTR-powered) for standby-mode status |
Applications
| Industrial Control Panel | Medical Diagnostic Terminal |
|---|---|
Use Scenario: Embedded x86 motherboard in sealed industrial HMI requiring RS-232 connectivity to PLCs, barcode scanners, and serial printers under wide temperature range. IC Role / Device Role / Timing Role: Primary Super I/O controller managing four isolated serial ports, GPIO-based sensor monitoring, and watchdog-triggered system recovery. Use Value: Enables single-chip consolidation of legacy serial I/O and wake-on-event functionality without external level shifters or discrete IR transceivers. |
Use Scenario: Portable diagnostic device with battery-backed standby mode needing reliable wake-on-serial activity (e.g., ECG data upload) and IR-based remote control. IC Role / Device Role / Timing Role: System management hub providing IrDA v1.2 infrared communication, UART-based medical device interfacing, and VTR-powered PME wake logic. Use Value: Delivers certified 4 Mbps IR link and guaranteed wake-from-sleep within 100 ms using internal 32.768 kHz clock or external crystal. |
| Retail Point-of-Sale Kiosk | Network Appliance Console Server |
Use Scenario: Fanless retail kiosk with thermal constraints requiring low-power idle states and serial debug access via front-panel COM port. IC Role / Device Role / Timing Role: LPC-connected I/O coprocessor handling serial console, GPIO-driven button/LED interface, and ACPI-compliant power state transitions. Use Value: Reduces BOM count by integrating 33 GPIOs, dual LED drivers, and watchdog into one 5×5 mm WFBGA package compatible with automated SMT assembly. |
Use Scenario: Rack-mounted network appliance requiring out-of-band serial console access to multiple switch/router units via aggregated RS-232 ports. IC Role / Device Role / Timing Role: Multi-port serial concentrator with four independent NS16550A UARTs, each assigned unique I/O base address and IRQ line. Use Value: Supports simultaneous 460 kbps console sessions across all four ports with hardware FIFO buffering to prevent data loss during high-throughput CLI operations. |
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 | 4 UARTs, 128-pin QFP package, integrated hardware monitor, no IrDA support | Requires larger PCB footprint; lacks infrared capability but adds thermal/voltage sensing | Select when system-level monitoring is prioritized over IR and space-constrained layouts are not critical |
| Nuvoton NCT6776D | 4 UARTs, 128-pin QFP, integrated fan controller, supports LPC and eSPI, no VTR domain | No VTR-powered wake logic; relies on host chipset for deep-sleep wake sources | Choose for modern eSPI-based platforms where legacy LPC is deprecated and standby current is managed externally |
Compared with ITE IT8786E and Nuvoton NCT6776D, the SCH3221-7U-TR uniquely delivers IrDA v1.2 support, VTR-domain wake logic enabling true zero-VCC standby operation, and a compact 64-ball WFBGA footprint - making it optimal for space-constrained, infrared-enabled, and ultra-low-power industrial designs.
Availability
SCH3221-7U-TR is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic terminals, and retail point-of-sale kiosks requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for SCH3221-7U-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 is a global semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions, with leadership in embedded control and power management ICs.
The SCH3221-7U-TR belongs to Microchip's legacy Super I/O product line, engineered specifically for PC-compatible embedded systems requiring ACPI-compliant serial, infrared, and system management I/O in space- and power-constrained environments.
FAQ
What is the maximum UART baud rate supported by the SCH3221-7U-TR?
The SCH3221-7U-TR supports a maximum UART baud rate of 460 kbps across all four NS16550A-compatible serial ports. This is achieved using its programmable baud rate generator and verified under full industrial temperature range (–40°C to +85°C) with 16-byte FIFOs preventing overrun errors at high throughput. The SCH3221-7U-TR does not support fractional dividers beyond this specification.
Does the SCH3221-7U-TR support wake-from-sleep using only the VTR supply?
Yes, the SCH3221-7U-TR supports full wake-from-sleep functionality under VTR-only power, including assertion of IO_PME# on UART ring indicator inputs (nRI1–nRI4), 22 designated GPIOs (e.g., GP11, GP20–GP23), and watchdog timeout. The WDT and LED2 remain operational under VTR, provided CLKI32 is grounded and CR1E[0] = 1 or an external 32.768 kHz clock is applied.
Is the SCH3221-7U-TR pin-compatible with other Microchip Super I/O devices?
No, the SCH3221-7U-TR is not pin-compatible with other Microchip Super I/O devices such as the SCH3112 or SCH3212. Its 64-ball WFBGA footprint, LPC signal mapping (e.g., LAD0–LAD3, LFRAME#), and multifunction ball assignments (e.g., GP21/IRTX2/WDT) are unique to the SCH3221 family. Board-level replacement requires schematic and layout revision.
What are the power supply requirements for the SCH3221-7U-TR's VTR pin?
The SCH3221-7U-TR requires a stable 3.3V ±10% VTR supply capable of delivering ≥6 mA when driving IO_PME# or nLED2 as push-pull outputs. VTR must reach minimum voltage at least 10 seconds before VCC power-on, and the differential between VTR and VCC must not exceed 500 mV during normal operation to ensure reliable PWRGOOD behavior and wakeup logic integrity.
Can the SCH3221-7U-TR's infrared ports operate simultaneously with full UART functionality?
Yes, the SCH3221-7U-TR's two IR ports (IRTX2/IRRX2 and IRTX3/IRRX3) operate concurrently with all four UARTs. Serial Port 2 shares pins with IRTX2/IRRX2 but is functionally independent; Serial Port 3 uses GP22/IRMODE/IRRX3 for third IR receive path. No resource contention exists - UART transmit/receive and IR modulation/demodulation are handled in parallel hardware blocks.
SCH3221-7U-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- I/O Controller
- Interface:
- -
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 64-WFBGA (6x6)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
SCH3221-7U-TR FAQ
1.How can I place an order for SCH3221-7U-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3221-7U-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 SCH3221-7U-TR reliable?
The price and inventory of SCH3221-7U-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH3221-7U-TR is usually 5 days.
3.What payment methods are accepted for SCH3221-7U-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3221-7U-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3221-7U-TR?
SCH3221-7U-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3221-7U-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 SCH3221-7U-TR?
For technical support, including SCH3221-7U-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3221-7U-TR requirements.
6.How does Aetrix verify that SCH3221-7U-TR is sourced from the original manufacturer or authorized distributors?
All SCH3221-7U-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 SCH3221-7U-TR meets industry standards.
7.What is the process for return or replacement of SCH3221-7U-TR?
All SCH3221-7U-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3221-7U-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 SCH3221-7U-TR part is unused and in its original packaging.
Return procedure for SCH3221-7U-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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