My Inquiry
My Account
Microchip Technology SCH3222-SX-TR
- Part No.:
- SCH3222-SX-TR
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 84-WFBGA
- Datasheet:
-
SCH3222-SX-TR.pdf
- Description:
- IC CTLR IO LPC MULT PORT 84WFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,213
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SCH3222-SX-TR from Microchip Technology is a 3.3V LPC Super I/O controller with 5V-tolerant SIO block, integrated 8042-compatible keyboard controller, four full-function UARTs (NS16C550A-compatible), IrDA 1.0 infrared interface, and 23 GPIOs - deployed in industrial motherboards for legacy I/O consolidation and power management.
For engineers reviewing the SCH3222-SX-TR datasheet, SCH3222-SX-TR pinout, SCH3222-SX-TR application, or SCH3222-SX-TR equivalent, this page delivers verified package mapping (84-ball WFBGA), confirmed LPC bus timing (19–33 MHz), hardware reset generation capability, and validated alternative part selection for motherboard design continuity.
Technical Context
The SCH3222-SX-TR implements an LPC interface compliant with Intel Low Pin Count Specification v1.0, supporting serialized IRQ and ACPI 2.0-compliant power states. It integrates an 8-bit 8042-compatible microcontroller with 2 KB ROM and 256 bytes RAM for keyboard/mouse control.
It provides four NS16C550A-compatible UARTs with 16-byte FIFOs, supporting baud rates up to 1.5 Mbps and RS485 auto-direction control. Unlike SCH3227/SCH3226, it lacks Hardware Monitor (HWM) and parallel port functionality per Table 1-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - defines maximum host-to-Super I/O data throughput and configuration register access speed |
| UART Count & Type | 4 × NS16C550A-compatible UARTs - enables simultaneous serial device connectivity (e.g., GPS, modem, debug console) |
| Max Baud Rate | 1.5 Mbps - supports high-speed serial protocols including industrial fieldbus extensions |
| GPIO Count | 23 general-purpose I/O pins - provides flexible board-level control, status indication, and strap configuration |
| Package | 84-ball WFBGA - surface-mount footprint optimized for space-constrained embedded motherboard layouts |
| Operating Temp | −40°C to +85°C (industrial grade) - ensures reliability in uncontrolled thermal environments like factory automation |
| Voltage Tolerance | SIO block 5V tolerant - allows direct interfacing with legacy 5V peripherals without level-shifting circuitry |
Pinout & Package
Package: 84-ball WFBGA (RoHS-compliant), 5 mm × 5 mm, 0.5 mm pitch, bottom-side solder balls. Ball grid layout defined in DS00002121B-page 20–22 (SCH3222 SUMMARY, Table 2-4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B2, C2, B3, D2, F1, G2, K6, K7, A4 | VSS (Ground) | Eight dedicated ground balls - ensure low-impedance return paths for digital, analog, and power domains |
| G1, C1, K5, G9, D4, E9 | VTR / VCCP_IN / +5V_IN / +2.5V_IN | Power supply inputs - decoupling required per DS00002121B Section 4.0 for stable core and I/O rail operation |
| B1, H1, J1, J2, K1, K10, J10, K9, J9, H10, H9, J8, G5, G10, F10, G7, J6, H6, F9, F8, F7, G6, E9, E10, D10, G4, E8, E7, D7, D9, C9, B9, B10, A10, A9, D6, B8, A8, A7, C6 | Functional I/O (UART, GPIO, LPC, IR, etc.) | 23 GPIOs + 4× UART (TXD/RXD/RTS/CTS/DSR/DTR/RI/DCD) + IrDA + LPC signals - mapped per Table 2-4; no HWM or parallel port pins present |
| A1 | GP40 | General-purpose input/output - configurable as VID input (per Table 1-1: "GPIO with VID compatible inputs: 0 to 6") for processor voltage identification |
Key Features
| Feature | Design Value |
|---|---|
| 8042 Keyboard Controller | Full software compatibility with Phoenix BIOS; includes 2 kB ROM, 256 B RAM, Port 92 support, and Fast Gate A20/KRESET outputs |
| Four Full-Function UARTs | NS16C550A-compatible with 16-byte TX/RX FIFOs - reduces CPU interrupt load and prevents data loss at high baud rates |
| IrDA 1.0 Infrared Interface | Integrated multiprotocol IR transceiver (SHARP ASK + IrDA) - enables contactless diagnostics and service port communication |
| LPC Serial IRQ Support | Serialized interrupt delivery over LPC bus - eliminates legacy ISA IRQ resource conflicts in modern x86 embedded systems |
| Programmable Clock Output | 16 Hz clock output via GP61/CLKO - usable for real-time clock reference or low-frequency system timing |
Applications
| Industrial Motherboard I/O Hub | Legacy PC Architecture Emulation |
|---|---|
Use Scenario: Consolidating serial, keyboard, infrared, and system control logic on compact industrial PC motherboards. IC Role / Device Role / Timing Role: Central Super I/O controller managing LPC-hosted peripheral interfaces and power sequencing. Use Value: Reduces discrete logic count by integrating UARTs, KBC, IR, and GPIOs - lowers BOM cost and PCB layer count. |
Use Scenario: Enabling Windows CE or DOS-based embedded systems requiring 8042 keyboard/mouse and COM port compatibility. IC Role / Device Role / Timing Role: Drop-in replacement for legacy Super I/O chips in x86 designs targeting PC99/PC2001 compliance. Use Value: Maintains BIOS-level software compatibility while supporting modern 3.3V core logic and industrial temperature range. |
| Factory Automation Serial Gateway | Secure Boot Platform Control |
Use Scenario: Connecting PLCs, HMIs, and barcode scanners via multiple RS232/RS485 ports in harsh factory environments. IC Role / Device Role / Timing Role: UART hub with RS485 auto-direction control and 1.5 Mbps baud rate handling real-time control traffic. Use Value: Eliminates external transceivers and direction-control logic - simplifies layout and improves EMI robustness. |
Use Scenario: Supporting secure boot chains via battery-backed 32-byte Security Key Register and SMI-triggered firmware validation. IC Role / Device Role / Timing Role: Trusted platform anchor providing authenticated device identity and tamper-resistant key storage. Use Value: Enables hardware-rooted authentication without external secure elements - reduces security subsystem complexity. |
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 |
|---|---|---|---|
| SCH3224-SX-TR | 100-ball WFBGA; adds two additional 4-pin serial ports; retains same UART count and LPC interface | Supports higher serial port density where board space permits larger package | Select when needing extra 4-pin UARTs for auxiliary devices without requiring HWM or parallel port |
| IT8786E-SX-GR | 128-pin QFP; includes hardware monitoring (voltage/temp/fan), but lacks IrDA and has different GPIO count (128 vs 23) | Used where thermal/voltage supervision is mandatory, not just serial/keyboard consolidation | Choose only if HWM functionality is required - incompatible pinout and register map preclude drop-in replacement |
Compared with SCH3222-SX-TR, SCH3224-SX-TR offers expanded serial I/O in a larger package but identical core functionality, while IT8786E-SX-GR trades IrDA and compact WFBGA for comprehensive hardware monitoring - making each suitable for distinct motherboard architecture priorities.
Availability
SCH3222-SX-TR is available at Aetrix Electronics and suitable for industrial motherboards, legacy PC emulation platforms, and factory automation gateways requiring stable component supply across extended product lifecycles.
Supply support for SCH3222-SX-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 components, and connectivity solutions for embedded control applications.
The SCH322x family was designed as a next-generation LPC Super I/O controller series targeting PC99/PC2001-compliant industrial and embedded x86 platforms with consolidated legacy I/O and enhanced power management.
FAQ
What is the primary function of the SCH3222-SX-TR in a motherboard design?
The SCH3222-SX-TR serves as a Super I/O controller, integrating keyboard/mouse control (8042-compatible), four NS16C550A UARTs, IrDA 1.0 infrared interface, and 23 GPIOs into a single 84-ball WFBGA package. It connects to the host CPU via the LPC bus and handles legacy I/O functions while supporting ACPI 2.0 power states - enabling compact, low-cost motherboard designs for industrial x86 systems. The SCH3222-SX-TR specifically omits hardware monitoring and parallel port features found in higher-pin-count variants.
Does the SCH3222-SX-TR support hardware monitoring (HWM) functionality?
No, the SCH3222-SX-TR does not include hardware monitoring capability. Per Table 1-1 in DS00002121B, HWM is explicitly listed as "NO" for SCH3222, unlike SCH3227, SCH3226, and SCH3224. This means the SCH3222-SX-TR lacks voltage sensing (+2.5V/+5V/+12V/Vccp), thermal diode inputs, fan tachometer/PWM outputs, and nHWM_INT signaling. Designers requiring these features must select SCH3224-SX-TR or higher variants.
What are the key differences between SCH3222-SX-TR and SCH3224-SX-TR?
The SCH3222-SX-TR uses an 84-ball WFBGA package with 23 GPIOs and no hardware monitor, while the SCH3224-SX-TR uses a 100-ball WFBGA package, adds two 4-pin serial ports, and retains hardware monitoring. Both share identical UART count (4), IrDA support, LPC interface, and 8042 KBC. The SCH3222-SX-TR is optimized for minimal footprint and cost-sensitive designs where HWM is unnecessary - the SCH3224-SX-TR suits applications needing expanded serial I/O and thermal/voltage supervision.
Can the SCH3222-SX-TR be used as a direct replacement for older Super I/O chips like the SCH311x series?
The SCH3222-SX-TR is the designated next-generation replacement for the SCH311x family, maintaining ISA Plug-and-Play register compatibility and ACPI 2.0 support. However, it uses a different package (84-ball WFBGA vs. older QFP), so PCB layout changes are required. Its Device ID register defaults to 0x7D (legacy SCH3116 mode) when STRAPOPT is strapped to VSS - ensuring BIOS compatibility. The SCH3222-SX-TR requires updated board-level strapping and firmware initialization but preserves functional equivalence for serial, keyboard, and system control roles.
What UART features does the SCH3222-SX-TR provide, and how are they implemented?
The SCH3222-SX-TR integrates four full-function NS16C550A-compatible UARTs, each with independent 16-byte transmit/receive FIFOs, programmable baud rate generation (up to 1.5 Mbps), RS485 auto-direction control, and full modem handshaking (RTS/CTS/DSR/DTR/RI/DCD). UART signals are assigned to specific balls per Table 2-4 (e.g., RXD1/TXD1 on K10/J10), and all UARTs support both interrupt and polling access modes. The SCH3222-SX-TR does not include the two additional 4-pin UARTs available on SCH3224/SCH3226.
SCH3222-SX-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 84-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- I/O Controller
- Core Processor:
- 8042 Keyboard Controller
- Program Memory Type:
- ROM (2kB)
- Controller Series:
- -
- RAM Size:
- 256 x 8
- Interface:
- IrDA, LPC, Parallel, Serial, UART
- Number of I/O:
- 23
- Voltage - Supply:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-WFBGA (7x7)
SCH3222-SX-TR FAQ
1.How can I place an order for SCH3222-SX-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3222-SX-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 SCH3222-SX-TR reliable?
The price and inventory of SCH3222-SX-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCH3222-SX-TR is usually 5 days.
3.What payment methods are accepted for SCH3222-SX-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3222-SX-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3222-SX-TR?
SCH3222-SX-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3222-SX-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 SCH3222-SX-TR?
For technical support, including SCH3222-SX-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3222-SX-TR requirements.
6.How does Aetrix verify that SCH3222-SX-TR is sourced from the original manufacturer or authorized distributors?
All SCH3222-SX-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 SCH3222-SX-TR meets industry standards.
7.What is the process for return or replacement of SCH3222-SX-TR?
All SCH3222-SX-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3222-SX-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 SCH3222-SX-TR part is unused and in its original packaging.
Return procedure for SCH3222-SX-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SCH3222-SX-TR 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…
