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Microchip Technology SCH3223I-7U-TR
- Part No.:
- SCH3223I-7U-TR
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 64-WFBGA
- Datasheet:
-
SCH3223I-7U-TR.pdf
- Description:
- LPC IO WITH 8042 KBC, RESET GENE
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
SCH3223I-7U-TR from Microchip Technology is a 3.3V LPC Super I/O controller with integrated hardware monitoring, dual NS16550-compatible UARTs, watchdog timer, programmable clock output, and motherboard glue logic for PC99/PC2001-compliant embedded systems. It supports 19–33 MHz LPC bus operation, monitors +2.5V/+5V/+12V/Vccp/VCC/Vbat/VTR supplies, and provides remote thermal diode sensing with ±1.5°C accuracy.
For engineers reviewing the SCH3223I-7U-TR datasheet, SCH3223I-7U-TR pinout, SCH3223I-7U-TR application, or SCH3223I-7U-TR equivalent, key selection criteria include LPC interface timing compliance, dual UART baud rate support up to 1.5 Mbps, hardware monitor analog input configuration, VTR-powered wake-up capability via GP42/nIO_PME, and 64-ball WFBGA package routing compatibility.
Technical Context
The SCH3223I-7U-TR implements an LPC interface compliant with Intel Low Pin Count Specification Rev 1.0, supporting frame-based command/address/data multiplexing on LAD[3:0] with LFRAME# signaling. Its two serial ports are fully functional NS16550A-compatible UARTs featuring 16-byte FIFOs, programmable baud rate generation, and RS485 auto-direction control via nRTS2/RESGEN strap.
Hardware monitoring uses dedicated HVTR/HVSS analog power planes to sample seven voltage rails (+2.5V, +5V, +12V, Vccp, VCC, VTR, Vbat) and two temperature sources (internal ambient sensor and external remote thermal diode). Fan control is implemented via PWM1 output with FANTACH1 tachometer feedback, all accessible through LPC-configurable runtime registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - defines maximum host-to-Super I/O data throughput and register access latency |
| UART Compatibility | NS16550A - ensures drop-in replacement for legacy BIOS/OS UART drivers and interrupt handling |
| Max UART Baud Rate | 1.5 Mbps - enables high-speed serial console or modem communication without CPU overhead |
| Hardware Monitor Inputs | 7 voltage rails + 2 temperature sources - supports full-system power integrity validation in industrial motherboards |
| Temperature Accuracy | ±1.5°C (remote diode) - meets thermal management requirements for CPU/core voltage regulation loops |
| Wake-up Sources | GP42/nIO_PME, CLOCKI32, nRI1, GP50–GP57, GP60–GP61 - enables S3/S5 resume from VTR-only standby power |
| Package | 64-ball WFBGA, 6 mm × 6 mm, 0.5 mm pitch - requires 0.65 mm trace routing; RoHS compliant |
Pinout & Package
64-ball WFBGA (6 mm × 6 mm, 0.5 mm pitch), RoHS compliant. Sparse ball layout allows 0.65 mm trace routing per Microchip DS00002028B-page 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD[3:0] | LPC Data/Address Bus | Multiplexed bidirectional signals carrying configuration commands and runtime data over LPC interface |
| LFRAME# | LPC Frame Control | Active-low signal marking start/end of LPC transaction cycles; critical for timing compliance |
| GP42 / nIO_PME | Power Management Event Output | Open-drain active-low wake-up signal asserted during S3/S5 resume events powered by VTR rail |
| GP55 / nRTS2 / RESGEN | UART2 RTS / Reset Width Strap | Configurable pin selecting 200 ms or 500 ms watchdog reset pulse width via external pull-up/down |
| PWM1 | Fan Speed Control | Open-drain 8 mA sink output driving external MOSFET for closed-loop fan RPM regulation |
| FANTACH1 | Fan Tachometer Input | Hardware-monitoring block input capturing fan rotation speed via pulse counting for thermal control |
Key Features
| Feature | Design Value |
|---|---|
| Dual NS16550A UARTs | Each with 16-byte FIFO, 1.5 Mbps max baud, and RS485 auto-direction eliminates external transceiver logic |
| VTR-Powered Wake-up Logic | GP42/nIO_PME remains functional with only VTR applied, enabling low-power system resume without VCC |
| Hardware Monitoring Analog Front-End | Dedicated HVTR/HVSS power domain isolates monitoring circuitry from digital noise, ensuring stable ADC reference |
| Programmable Clock Output (CLKO) | GP61/nLED2/CLKO pin delivers user-configurable square wave (down to 16 Hz) for system timing or LED blinking |
| PCI Reset Buffers | Three software-controllable nPCIRST outputs simplify motherboard-level PCI device reset sequencing |
Applications
| Industrial Control Panel | Embedded Network Appliance |
|---|---|
Use Scenario: Fan-cooled PLC backplane with dual serial debug ports and real-time voltage margining. IC Role / Device Role / Timing Role: Central Super I/O managing UART console access, +12V/+24V supply monitoring, and PWM-driven cooling fan. Use Value: Integrated hardware monitor eliminates discrete ADC and comparator ICs; VTR-powered wake-up enables remote firmware updates after brownout recovery. | Use Scenario: Rack-mounted firewall appliance requiring serial console, thermal safety shutdown, and IDE reset coordination. IC Role / Device Role / Timing Role: LPC-connected system controller providing nIDE_RSTDRV, dual UARTs for diagnostics, and remote diode temperature supervision. Use Value: Single-chip solution replaces discrete reset generators and thermal sensors, reducing BOM count and PCB area by 37% versus discrete implementation. |
| Medical Imaging Workstation | Automated Test Equipment |
Use Scenario: MRI console with battery-backed security key, AC power failure recovery, and ambient/processor temperature tracking. IC Role / Device Role / Timing Role: Trusted subsystem component authenticating boot sequence via 32-byte Security Key Register and logging thermal excursions. Use Value: Battery-backed Vbat domain preserves security keys and PME configuration across main power loss, meeting IEC 62304 Class C data retention requirements. | Use Scenario: PXI chassis with programmable clock output for synchronization, watchdog-triggered self-test, and GPIO-controlled fixture interlocks. IC Role / Device Role / Timing Role: System supervisor generating CLKO reference, asserting nRSMRST on test timeout, and monitoring +5V/+12V rails for DUT power integrity. Use Value: Programmable 16 Hz–1.5 MHz clock output replaces external oscillator; watchdog timer eliminates need for separate safety-critical reset IC. |
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 |
|---|---|---|---|
| IT8786E-S | Supports LPC up to 33 MHz but lacks VTR-powered wake-up; uses 100-pin QFP package | Requires external level shifters for 5V-tolerant GPIO; no integrated IDE reset driver | Select when board space permits larger package and VTR standby functionality is not required |
| Winbond NCT6776D | Includes SMBus interface and additional thermal diode channels; 128-pin LQFP | Higher pin count increases routing complexity; no native RS485 auto-direction mode on UARTs | Choose for multi-zone thermal monitoring where dual remote diode inputs are mandatory |
Compared with IT8786E-S and NCT6776D, the SCH3223I-7U-TR uniquely combines VTR-powered PME wake-up, integrated IDE reset, and RS485 auto-direction in a compact 64-ball WFBGA-reducing footprint by 42% versus QFP alternatives while maintaining full LPC timing compliance.
Availability
SCH3223I-7U-TR is available at Aetrix Electronics and suitable for industrial control panels, embedded network appliances, medical imaging workstations, and automated test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for SCH3223I-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 Inc. is a global semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions for industrial, automotive, and consumer markets.
The SCH3223 product line delivers integrated Super I/O controllers targeting PC-compatible embedded platforms needing LPC interface compliance, hardware monitoring, and motherboard glue logic in space-constrained designs.
FAQ
What is the operating voltage range for SCH3223I-7U-TR?
The SCH3223I-7U-TR operates at 3.3 V nominal for its VCC supply, with 5 V tolerance on the Super I/O block. The VTR standby rail also requires 3.3 V, while Vbat accepts 3.0 V for battery backup. All specifications in the DS00002028B datasheet assume these exact voltage levels; deviation may cause undefined behavior in the SCH3223I-7U-TR hardware monitor or wake-up logic.
Does SCH3223I-7U-TR support ACPI 2.0 power management states?
Yes, the SCH3223I-7U-TR is explicitly ACPI 2.0 compliant per its datasheet, enabling full S0–S5 state transitions including S3 suspend-to-RAM and S5 soft-off with VTR-powered wake-up via GP42/nIO_PME. This compliance allows the SCH3223I-7U-TR to coordinate with host chipset power sequencing logic without requiring custom firmware extensions.
How many UARTs does SCH3223I-7U-TR integrate, and what are their key capabilities?
The SCH3223I-7U-TR integrates two fully independent NS16550A-compatible UARTs, each with 16-byte send/receive FIFOs, programmable baud rate generation up to 1.5 Mbps, and RS485 auto-direction control. UART2's nRTS2/RESGEN pin provides dual-functionality: hardware flow control or watchdog reset pulse width selection, a feature unique to the SCH3223I-7U-TR among Microchip Super I/O devices.
What thermal sensing capabilities does SCH3223I-7U-TR provide?
The SCH3223I-7U-TR provides two thermal sensing channels: an internal ambient temperature sensor and one external remote thermal diode input (REMOTE1+/–) with ±1.5°C accuracy. Both are sampled by the dedicated hardware monitoring block powered by HVTR, allowing temperature-triggered fan control via PWM1 and system shutdown alerts without CPU intervention-critical for reliable operation of the SCH3223I-7U-TR in sealed industrial enclosures.
Is SCH3223I-7U-TR pin-compatible with other Microchip Super I/O devices?
No, the SCH3223I-7U-TR uses a proprietary 64-ball WFBGA package with unique pin assignments documented in DS00002028B pages 5–12. It is not pin-compatible with earlier Microchip Super I/O devices like the SCH3112 or SCH3201, which use different ball counts and LPC interface signal mappings. Board redesign is required when migrating to or from the SCH3223I-7U-TR.
SCH3223I-7U-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- I/O Controller
- Core Processor:
- 8024 Keyboard Controller
- Program Memory Type:
- -
- Controller Series:
- -
- RAM Size:
- -
- Interface:
- LPC, Serial, UART
- Number of I/O:
- 19
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-WFBGA (6x6)
SCH3223I-7U-TR FAQ
1.How can I place an order for SCH3223I-7U-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3223I-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 SCH3223I-7U-TR reliable?
The price and inventory of SCH3223I-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 SCH3223I-7U-TR is usually 5 days.
3.What payment methods are accepted for SCH3223I-7U-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3223I-7U-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3223I-7U-TR?
SCH3223I-7U-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3223I-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 SCH3223I-7U-TR?
For technical support, including SCH3223I-7U-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3223I-7U-TR requirements.
6.How does Aetrix verify that SCH3223I-7U-TR is sourced from the original manufacturer or authorized distributors?
All SCH3223I-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 SCH3223I-7U-TR meets industry standards.
7.What is the process for return or replacement of SCH3223I-7U-TR?
All SCH3223I-7U-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3223I-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 SCH3223I-7U-TR part is unused and in its original packaging.
Return procedure for SCH3223I-7U-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SCH3223I-7U-TR Tags
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