My Inquiry
My Account
Microchip Technology SCH3222I-SX-TR
- Part No.:
- SCH3222I-SX-TR
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 84-WFBGA
- Datasheet:
-
SCH3222I-SX-TR.pdf
- Description:
- LPC IO WITH 8042 KBC, RESET GENE
- Quantity:
- Payment:
- Shipping:
Inventory:1,385
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SCH3222I-SX-TR from Microchip Technology is an industrial-grade (−40°C to +85°C), 84-ball WFBGA Super I/O controller with LPC interface, 3.3V core operation (5V-tolerant SIO block), four full-function NS16C550A-compatible UARTs, IrDA 1.0 infrared port, and 23 GPIOs - deployed in embedded PC-compatible motherboards for legacy I/O consolidation.
For engineers reviewing the SCH3222I-SX-TR datasheet, SCH3222I-SX-TR pinout, SCH3222I-SX-TR application, or SCH3222I-SX-TR equivalent, key selection criteria include LPC bus timing compliance (19–33 MHz), 1.5 Mbps UART baud rate support, 8042 keyboard controller integration, strap-configurable serial port count, and absence of hardware monitoring (HWM) functionality per device-specific summary.
Technical Context
The SCH3222I-SX-TR implements a Low Pin Count (LPC) interface compliant with Intel LPC Specification Rev 1.0, supporting bus frequencies from 19 MHz to 33 MHz and serialized IRQ delivery. It integrates an 8-bit 8042-compatible keyboard controller with 2 KB ROM and 256 bytes RAM, plus asynchronous access to status/data registers and fast Gate A20/KRESET outputs.
It provides four full-function serial ports (NS16C550A-compatible) with 16-byte FIFOs, RS485 auto-direction control, and programmable baud rates up to 1.5 Mbps; two additional 4-pin serial ports are always enabled. Unlike SCH3227/SCH3226/SCH3224, the SCH3222 variant excludes Hardware Monitor (HWM), parallel port, IDE/PCI reset outputs, and power button/AC fail recovery logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LPC Bus Frequency | 19–33 MHz - defines maximum host-to-Super I/O command throughput and configuration register access latency. |
| UART Count & Type | 4 × full-function NS16C550A-compatible UARTs - enables simultaneous RS232/RS485 interfaces with 16-byte FIFO buffering and hardware flow control. |
| Max Baud Rate | 1.5 Mbps - supports high-speed serial communication for industrial telemetry and diagnostics without external UART bridging. |
| GPIO Count | 23 general-purpose I/O pins - provides flexible board-level control, status indication, and peripheral enable signaling. |
| Package | 84-ball WFBGA (RoHS-compliant) - surface-mount footprint optimized for space-constrained embedded motherboard layouts. |
| Operating Temp | −40°C to +85°C - qualified for industrial environments including factory automation and ruggedized computing. |
| Power Supply | 3.3V core (5V-tolerant SIO block) - simplifies power rail design while maintaining compatibility with legacy 5V peripherals. |
Pinout & Package
84-ball WFBGA package (0.5 mm pitch, 6.0 mm × 6.0 mm body), RoHS-compliant, with ball-out mapping defined in DS00002121B-page 21 (Table 2-4). Functions include LPC data/address/control signals (LAD0–LAD3, LFRAME#, LDRQ#), UART I/O (TXD1–TXD4, RXD1–RXD4), keyboard/mouse interface (KCLK, KDAT, MCLK, MDAT), and system control (nRSMRST, nTHERMTRIP, PWRGD_OUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B2, C2, B3, D2 | LAD0–LAD3 | LPC bidirectional address/data multiplexed bus - carries configuration, runtime, and I/O port accesses between host and Super I/O. |
| F1 | LFRAME# | Frame signal indicating start of LPC transaction - synchronizes host-initiated configuration cycles and I/O transfers. |
| F2 | PCI_RESET# | Active-low PCI reset output - asserts system-wide reset on LPC command or watchdog timeout (configurable). |
| E10, D10, G4, E8 | RXD1–RXD4 / TXD1–TXD4 | Full-duplex UART data I/O - supports independent RS232/RS485 links with hardware RTS/CTS and auto-direction control. |
| J3, J4, F4, E4 | KDAT, KCLK, MDAT, MCLK | Keyboard/mouse controller interface - implements 8042 protocol for PS/2 keyboard and mouse connectivity. |
| B8 | nRSMRST | Resume reset output - generates reset pulse upon wake-from-suspend event, enabling reliable OS resume sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 8042 Keyboard Controller | Integrated 8-bit microcontroller with 2 KB ROM and 256 bytes RAM - eliminates need for discrete keyboard controller IC and reduces BOM count. |
| Serial IRQ Support | Serialized interrupt delivery over LPC bus - enables shared IRQ routing for multiple serial ports without dedicated interrupt lines. |
| IrDA 1.0 Infrared Port | Dedicated IR transmit/receive pins (GP52/GP53) with SHARP ASK and IrDA 1.0 protocol support - enables contactless firmware update and diagnostics. |
| Programmable Clock Output | CLKO pin (GP61) configurable down to 16 Hz - supplies precise timing reference for real-time clocks or low-power system timers. |
| Watchdog Timer | Configurable timeout with nWDT output (GP60) - provides autonomous system recovery from software lockup without host CPU intervention. |
Applications
| Industrial Control Panel | Embedded PC/AT Motherboard |
|---|---|
Use Scenario: DIN-rail mounted HMI with dual RS232 serial interfaces for PLC communication and local debug port, plus IR for remote configuration. IC Role / Device Role / Timing Role: Central Super I/O hub managing UARTs, keyboard, and system reset sequencing under ACPI power states. Use Value: Consolidates 4 UARTs, 8042 controller, and LPC-based configuration into single 84-ball WFBGA - reduces PCB area by >65% vs. discrete solution. |
Use Scenario: Fanless x86-based edge gateway requiring PS/2 keyboard support, four serial ports for sensor aggregation, and watchdog safety monitoring. IC Role / Device Role / Timing Role: LPC-connected I/O companion providing legacy interface bridging and system-level power management coordination. Use Value: Enables full PC/AT compatibility (including Port 92, A20 gate, KRESET) while operating at −40°C to +85°C without thermal derating. |
| Medical Diagnostic Terminal | Ruggedized Point-of-Sale System |
Use Scenario: CE-certified bedside terminal with isolated RS232 for ECG monitor link, IR for secure firmware updates, and GPIO-driven status LEDs. IC Role / Device Role / Timing Role: Trusted I/O controller handling secure boot-related GPIOs, keyboard input, and serial diagnostic logging. Use Value: Security Key Register (32-byte) enables device authentication during firmware validation - meets IEC 62304 traceability requirements. |
Use Scenario: Outdoor kiosk with serial receipt printer, magnetic stripe reader, and PS/2 cash drawer - all powered from single ATX-derived supply. IC Role / Device Role / Timing Role: Power-aware Super I/O managing wake-on-serial, SMI-triggered inventory sync, and power-good sequencing. Use Value: Programmable PWRGD_OUT and PWRGD_PS outputs coordinate multi-rail power-up timing - ensures stable boot across wide temperature range. |
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 |
|---|---|---|---|
| SCH3224I-SX-TR | 100-ball WFBGA; adds Hardware Monitor (voltage/temp/fan sensing) and 24 GPIOs; no IDE/PCI reset outputs. | Required where board-level thermal/voltage supervision is needed (e.g., server management controllers). | Select SCH3224I-SX-TR only if HWM functionality is mandatory - SCH3222I-SX-TR lacks analog monitoring circuitry entirely. |
| SCH3226I-SX-TR | 100-ball WFBGA; includes HWM, parallel port (EPP/ECP), IDE/PCI reset outputs, and 40 GPIOs. | Suitable for full-featured ATX motherboards needing parallel port legacy support and fan control PWM outputs. | Choose SCH3226I-SX-TR when parallel port or IDE reset generation is required - SCH3222I-SX-TR omits both features. |
Compared with SCH3224I-SX-TR and SCH3226I-SX-TR, the SCH3222I-SX-TR delivers minimal-footprint serial/keyboard consolidation without HWM or parallel logic - optimizing cost and layout density for space-constrained industrial PCs where those features are unnecessary.
Availability
SCH3222I-SX-TR is available at Aetrix Electronics and suitable for industrial control panels, embedded PC/AT motherboards, medical diagnostic terminals, and ruggedized point-of-sale systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SCH3222I-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 leading provider of microcontrollers, analog components, and connectivity solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and long-term product support.
The SCH322x family was designed as a next-generation LPC Super I/O controller targeting PC-compatible embedded platforms requiring consolidated legacy I/O, ACPI-compliant power management, and robust industrial temperature operation - succeeding the SCH311x series.
FAQ
What is the primary function of the SCH3222I-SX-TR in a system architecture?
The SCH3222I-SX-TR serves as a Super I/O controller that consolidates legacy PC interfaces - including four NS16C550A-compatible UARTs, an 8042 keyboard/mouse controller, IrDA 1.0 infrared port, and GPIOs - onto a single LPC-connected device. Its role is to offload I/O management from the host CPU and enable compact, low-cost embedded motherboard designs compatible with PC/AT and ACPI standards. The SCH3222I-SX-TR specifically targets applications where Hardware Monitor functionality is not required.
Does the SCH3222I-SX-TR support hardware monitoring (voltage, temperature, fan speed)?
No, the SCH3222I-SX-TR does not include hardware monitoring capability. According to Table 1-1 in DS00002121B, Hardware Monitor is explicitly marked "NO" for SCH3222, unlike SCH3227, SCH3226, and SCH3224. It lacks analog inputs for +2.5V/+5V/+12V/Vccp monitoring, thermal diode interfaces, fan tachometer inputs, and PWM fan control outputs. Designers requiring voltage or temperature supervision must select SCH3224I-SX-TR or higher variants.
What are the key differences between SCH3222I-SX-TR and SCH3224I-SX-TR?
The SCH3222I-SX-TR (84-ball WFBGA) and SCH3224I-SX-TR (100-ball WFBGA) share identical UART count (4 full-function), IrDA support, and keyboard controller features, but differ critically in Hardware Monitor inclusion (SCH3224 has it; SCH3222 does not), GPIO count (23 vs. 24), and package size. SCH3224 also adds two 4-pin serial ports by default, whereas SCH3222 enables them unconditionally. Neither supports parallel port or IDE/PCI reset outputs.
Can the SCH3222I-SX-TR be used as a direct replacement for the SCH311x family?
The SCH3222I-SX-TR is the designated successor to the SCH311x family and maintains functional compatibility for core Super I/O features (UARTs, keyboard controller, LPC interface, GPIOs). However, pinout and strap options differ: SCH3222 uses an 84-ball WFBGA versus older PQFP packages, and its STRAPOPT behavior is internal-only (no exposed pin), resulting in fixed Device ID 0x7F. Board redesign is required - it is not a drop-in replacement.
What is the maximum UART baud rate supported by the SCH3222I-SX-TR?
The SCH3222I-SX-TR supports UART data rates up to 1.5 Mbps, as confirmed in the General Description (DS00002121B-page 4) and Serial Port section (page 37). This is achieved via its NS16C550A-compatible UART cores with programmable baud rate generators and 16-byte send/receive FIFOs - enabling high-throughput serial communication for industrial telemetry, barcode scanners, and diagnostic tools without external clocking or bridging.
SCH3222I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-WFBGA (7x7)
SCH3222I-SX-TR FAQ
1.How can I place an order for SCH3222I-SX-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SCH3222I-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 SCH3222I-SX-TR reliable?
The price and inventory of SCH3222I-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 SCH3222I-SX-TR is usually 5 days.
3.What payment methods are accepted for SCH3222I-SX-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCH3222I-SX-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCH3222I-SX-TR?
SCH3222I-SX-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCH3222I-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 SCH3222I-SX-TR?
For technical support, including SCH3222I-SX-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCH3222I-SX-TR requirements.
6.How does Aetrix verify that SCH3222I-SX-TR is sourced from the original manufacturer or authorized distributors?
All SCH3222I-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 SCH3222I-SX-TR meets industry standards.
7.What is the process for return or replacement of SCH3222I-SX-TR?
All SCH3222I-SX-TR units undergo pre-shipment inspection (PSI). If there is an issue with SCH3222I-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 SCH3222I-SX-TR part is unused and in its original packaging.
Return procedure for SCH3222I-SX-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SCH3222I-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…
