My Inquiry
My Account
Microchip Technology SCH3223-7U
- Part No.:
- SCH3223-7U
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 64-WFBGA
- Datasheet:
-
SCH3223-7U.pdf
- Description:
- IC CTLR IO LPC MULT PORT 64WFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,138
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SCH3223-7U from Microchip Technology is a 3.3V LPC Super I/O controller with integrated hardware monitoring, dual NS16550-compatible UARTs, watchdog timer, 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 delivers remote thermal diode sensing (±1.5°C accuracy) plus one PWM-controlled fan.
For engineers reviewing the SCH3223-7U datasheet, SCH3223-7U pinout, SCH3223-7U application, or SCH3223-7U equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios in industrial motherboards and legacy I/O expansion, and confirmed alternative parts with documented functional trade-offs.
Technical Context
The SCH3223-7U implements an LPC interface compliant with Intel Low Pin Count Specification v1.0, supporting serialized IRQ and ISA Plug-and-Play register set v1.0a for logical device reconfiguration. Its hardware monitor block uses HVTR-powered analog front-end to sample seven voltage rails and two temperature sources - internal ambient sensor and external thermal diode - with limit comparison and automatic fan PWM control.
Power management includes ACPI 2.0-compliant Sx state support, programmable PME wake events via GP42/nIO_PME, SLP_SX# input detection, and dual power-good signaling (PWRGD_PS input, PWRGD_OUT open-drain output). The two UARTs feature 16-byte FIFOs, baud rates up to 1.5 Mbps, RS485 auto-direction control, and IRQ sharing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - enables direct connection to modern x86 chipset LPC hubs without clock dividers |
| UART Compatibility | NS16550A - ensures drop-in software compatibility with legacy BIOS and OS serial drivers |
| Hardware Monitor Inputs | +2.5V, +5V, +12V, Vccp, VCC, Vbat, VTR - covers full ATX motherboard rail set for comprehensive power validation |
| Temperature Sensing | Internal ambient + 1 remote thermal diode (±1.5°C) - supports CPU die and board-level thermal management |
| Fan Control | 1 PWM output (PWM1) + 1 tachometer input (FANTACH1) - enables closed-loop speed regulation based on monitored temperature |
| GPIO Count | 19 pins including 2 VID-compatible inputs (GP62/GP63) - allows dynamic processor voltage identification and system status signaling |
| Package | 64-ball WFBGA, 6 mm × 6 mm, 0.5 mm pitch - compact footprint suitable for space-constrained industrial mainboards |
Pinout & Package
64-ball WFBGA package (6 mm × 6 mm, 0.5 mm ball pitch), RoHS compliant, with sparse layout enabling 0.65 mm trace routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GP55 / nRTS2 / RESGEN | Multi-function terminal | Configurable as UART2 RTS output or hardware reset pulse width strap (200 ms / 500 ms selection) |
| PWRGD_OUT | Open-drain power-good output | Signals system readiness to downstream logic; requires external pull-up to VCC |
| nRSMRST | Resume reset output | Active-low signal asserting resume from S3/S4/S5 states; open-drain, 24 mA sink capability |
| GP60 / nLED1 / WDT | Multi-function output | Drives LED1 under VTR power during standby; doubles as watchdog timeout indicator |
| REMOTE1+ / REMOTE1− | Thermal diode interface | Differential current-source/sink pair for accurate remote temperature measurement (e.g., CPU diode) |
| LAD[3:0] | LPC address/data multiplexed bus | Carries command, address, and data cycles over shared 4-bit bidirectional lines per LPC spec |
Key Features
| Feature | Design Value |
|---|---|
| ACPI 2.0 compliance | Enables standardized OS power-state transitions (S0–S5) without custom firmware hooks |
| Security Key Register | 32-byte battery-backed register for device authentication and secure boot chain anchoring |
| PCI Reset Buffers | Three software-controllable nPCIRST outputs (GP45/GP46/GP47) simplify PCIe slot reset sequencing |
| RS485 Auto Direction Control | UART1 automatically toggles nRTS1 to manage half-duplex bus direction - eliminates external transceiver control logic |
| VTR-powered wake logic | Retains PME, SMI, and GPIO wakeup capability during VCC removal - critical for instant-on embedded applications |
Applications
| Industrial Motherboard Management | Legacy Serial Expansion |
|---|---|
Use Scenario: Embedded industrial PC requiring reliable power sequencing, thermal safety shutdown, and long-term supply stability across -40°C to +85°C. IC Role / Device Role / Timing Role: Central Super I/O hub managing LPC host interface, voltage/fan/temperature telemetry, and reset generation for CPU and peripherals. Use Value: Eliminates discrete reset generators, analog monitoring ICs, and UART controllers - reduces BOM count by ≥7 components while maintaining PC99 compliance. |
Use Scenario: Retrofitting RS232/RS485 serial ports onto modern x86 platforms lacking native COM headers. IC Role / Device Role / Timing Role: Dual high-speed UART bridge between LPC bus and external level-shifted serial transceivers. Use Value: Supports 1.5 Mbps baud rate and RS485 auto-direction mode - enables deterministic real-time serial communication in factory automation PLCs. |
| Power-Failure Recovery Systems | Secure Boot Platform Initialization |
Use Scenario: Medical or telecom equipment needing automatic AC power failure recovery and graceful shutdown coordination. IC Role / Device Role / Timing Role: Monitors PS_ON#, PB_IN#, PWRGD_PS, and Vbat to trigger controlled power cycle via PS_ON# and nRSMRST. Use Value: Integrates low-battery detection, power-button debouncing, and resume-reset timing - removes need for external supervisor ICs. |
Use Scenario: Trusted computing platform requiring hardware-rooted identity before UEFI execution. IC Role / Device Role / Timing Role: Stores immutable 32-byte security key in battery-backed register accessible only after authenticated configuration unlock. Use Value: Provides tamper-resistant credential storage independent of flash memory - prevents firmware rollback attacks targeting boot ROM. |
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 48 MHz LPC; adds SMBus controller and TPM interface; lacks VID GPIOs | Better suited for high-end client platforms with TPM requirements; not pin-compatible | Select when SMBus host controller and TPM 2.0 support are required; verify LPC timing margin at 48 MHz |
| Winbond NCT6776D | Higher-resolution ADC (12-bit vs 10-bit); adds second thermal diode channel; same 64-pin WFBGA | Preferred for multi-CPU or GPU thermal monitoring; identical footprint enables drop-in replacement | Choose for enhanced thermal accuracy and dual-diode support; confirm GPIO mapping matches SCH3223-7U's GP62/GP63 VID inputs |
Compared with IT8786E-S and NCT6776D, the SCH3223-7U offers lower power consumption in VTR standby mode, guaranteed PC99/PC2001 compliance, and integrated IDE reset output - making it optimal for cost-sensitive industrial designs where legacy compatibility and minimal sleep current are prioritized.
Availability
SCH3223-7U is available at Aetrix Electronics and suitable for industrial motherboards, legacy serial expansion modules, power-failure recovery systems, and secure boot platform initialization requiring stable component supply across extended temperature ranges.
Supply support for SCH3223-7U 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 for industrial, automotive, and consumer markets.
The SCH3223-7U belongs to Microchip's Super I/O product line, designed specifically to consolidate legacy PC I/O, power management, and hardware monitoring into a single LPC-connected device for embedded x86 platforms.
FAQ
What is the operating temperature range for the SCH3223-7U?
The SCH3223-7U is specified for industrial operation from −40°C to +85°C. This rating applies to the full functional set including hardware monitoring, UART operation, and LPC interface timing. Commercial grade (0°C to +70°C) variants exist but are distinct orderable parts; SCH3223-7U explicitly denotes the industrial version per Microchip's nomenclature.
Does the SCH3223-7U support ACPI S4 (hibernate) state transitions?
Yes, the SCH3223-7U fully supports ACPI 2.0, including S4 hibernate entry and resume. Its VTR-powered wake logic retains PME configuration and monitors GP42/nIO_PME, CLOCKI32, and serial port RI/DCD signals during S4, enabling wake-on-ring or wake-on-clock event - confirmed in DS00002028B Section 8.0 and Table 24-1.
How many voltage rails can the SCH3223-7U monitor simultaneously?
The SCH3223-7U monitors seven voltage rails: +2.5V, +5V, +12V, Vccp (processor core), VCC (main I/O), Vbat (battery), and VTR (standby). Each is sampled via dedicated analog inputs tied to the HVTR power plane, with limit registers configurable per rail in the Hardware Monitoring Register Set (Section 21.0).
Is the SCH3223-7U pin-compatible with earlier Microchip Super I/O devices like the SCH3112?
No, the SCH3223-7U is not pin-compatible with SCH3112. It uses a 64-ball WFBGA package versus SCH3112's 128-pin LQFP, and pin functions differ significantly - e.g., SCH3223-7U integrates PCI reset buffers and IDE reset on GPIOs, while SCH3112 uses dedicated pins. Migration requires PCB redesign and firmware register mapping updates.
What UART features differentiate the SCH3223-7U from basic 16550 implementations?
Beyond standard NS16550A compatibility, the SCH3223-7U adds RS485 auto-direction control (nRTS1 toggled automatically), IRQ sharing between UART1 and UART2, and 16-byte FIFOs with programmable trigger levels. These features reduce host CPU overhead and enable robust half-duplex fieldbus communication without external logic - detailed in Section 7.0 of DS00002028B.
SCH3223-7U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-WFBGA
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-WFBGA (6x6)
SCH3223-7U FAQ
1.How can I place an order for SCH3223-7U through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3223-7U 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 SCH3223-7U reliable?
The price and inventory of SCH3223-7U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH3223-7U is usually 5 days.
3.What payment methods are accepted for SCH3223-7U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3223-7U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3223-7U?
SCH3223-7U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3223-7U 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 SCH3223-7U?
For technical support, including SCH3223-7U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3223-7U requirements.
6.How does Aetrix verify that SCH3223-7U is sourced from the original manufacturer or authorized distributors?
All SCH3223-7U 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 SCH3223-7U meets industry standards.
7.What is the process for return or replacement of SCH3223-7U?
All SCH3223-7U units undergo pre-shipment inspection (PSI). If there is an issue with SCH3223-7U, 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 SCH3223-7U part is unused and in its original packaging.
Return procedure for SCH3223-7U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SCH3223-7U Tags
-
CYPD3175-24LQXQ
Infineon Technologies
-
SLB9672VU20FW1523XTMA1
Infineon Technologies
-
SLB9670VQ20FW785XTMA1
Infineon Technologies
-
SLB9672XU20FW1523XTMA1
Infineon Technologies
-
SLB9673XU20FW2613XTMA1
Infineon Technologies
-
CYPD3125-40LQXIT
Infineon Technologies
-
AT97SC3204-U2A1A-20
Microchip Technology
-
AT97SC3204-U2A1A-10
Microchip Technology
-
SLM9670AQ20FW1311XTMA1
Infineon Technologies
-
SLB9672XU20FW1613XTMA1
Infineon Technologies
-
SLB9672AU20FW1613XTMA1
Infineon Technologies
-
SLB9673AU20FW2613XTMA1
Infineon Technologies
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
