My Inquiry
My Account
Microchip Technology KBC1122-AJZS
- Part No.:
- KBC1122-AJZS
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 156-VFQFN Dual Rows, Exposed Pad
- Datasheet:
-
KBC1122-AJZS.pdf
- Description:
- IC INTFACE SPECIALIZED 156DQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,725
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KBC1122-AJZS from SMSC is a mobile Keyboard/Controller (KBC) with integrated Super I/O, Shared Flash Interface (SFI), 8-channel ADC, 3-channel DAC, and SMSC SentinelAlert! functionality. It operates at 3.3V with 5V-tolerant buffers, supports ACPI 1.0b/2.0 and PC99a/PC2001 standards, and delivers system power management in laptop and embedded computing platforms.
For engineers reviewing the KBC1122-AJZS datasheet, KBC1122-AJZS pinout, KBC1122-AJZS application, or KBC1122-AJZS equivalent, key selection criteria include LPC/FWH host flash interface support, dual-port SPI, 8MB SFI arbitration, 92 GPIOs, and direct battery management with thermal event detection via HW_PROTECT#.
Technical Context
The KBC1122-AJZS implements a dual-power-plane architecture (VCC1/VCC0) enabling instant-on operation and low-standby-current sleep modes. Its embedded 8051 core executes keyboard/system control firmware while managing hardware-accelerated PS/2, SMBus, IRCC/CIRCC, and UART peripherals.
LPC interface compliance includes Clock Run support, Serial IRQ, 15 direct IRQs, three 8-bit DMA channels, ACPI SCI, nSMI, and shadowed write-only registers. The SFI subsystem provides 0.5–8MB host/8051 flash arbitration with programmable access protection, page-based 32KB code space, and host flash address redirection for BIOS recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V main supply with 5V-tolerant I/O buffers for legacy peripheral interfacing |
| LPC Interface | ACPI 1.0b/2.0 and PC99a/PC2001 compliant with Clock Run, Serial IRQ, and FWH memory access |
| SFI Capacity | 8MB shared flash interface with hardware-arbitrated 8051/host access and programmable bank-level protection |
| ADC/DAC | 8-channel 8b/10b ADC (20ms full-channel conversion); 3-channel 8b DAC with SentinelAlert! monitoring |
| Package | 156-pin DQFN, lead-free and RoHS-compliant, optimized for compact mobile motherboard layouts |
| Power Management | Dual power planes (VCC1/VCC0), IDLE/SLEEP/Hibernation modes, and fail-safe ±10% ring oscillator |
| Wake Sources | 36 maskable hardware wake-up events including PS/2 edge, IR data patterns (NEC/RC5), and thermal alerts |
Pinout & Package
156-pin DQFN (Dual Quad Flat No-lead) package, lead-free and RoHS-compliant, with exposed thermal pad for enhanced thermal dissipation in space-constrained mobile platforms.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1, VCC0 | Main & Standby Power Supplies | Independent power domains enable instant-on and deep-sleep operation without host CPU involvement |
| LPC_AD[3:0] | LPC Address/Data Multiplex | Time-multiplexed 4-bit address/data bus for LPC transactions with host chipset |
| SFI_A[22:0] | Shared Flash Interface Address | 23-bit address bus supporting up to 8MB flash addressing with hardware arbitration |
| ADC_IN[7:0] | Analog Input Channels | Eight dedicated analog inputs for temperature, voltage, and current sensing with SentinelAlert! integration |
| DAC_OUT[2:0] | Digital-to-Analog Outputs | Three 8-bit DAC outputs for fan speed control, bias adjustment, or sensor calibration signals |
| HW_PROTECT# | Hardware Thermal Alert Output | Open-drain output asserting on overtemperature condition-no firmware or 8051 intervention required |
Key Features
| Feature | Design Value |
|---|---|
| Embedded 8051 Core | High-performance 8051 executing keyboard/system control firmware with 512B RAM, 2KB scratch ROM/RAM, and 32KB flash-accessible code space |
| Serial Flash Programming | Dedicated interface enabling in-system programming of external SPI flash without host CPU involvement |
| Triple PS/2 Controller | Three independent hardware-driven PS/2 ports fully operational in main/suspend power states with protocol-specific wake capability |
| SMSC SentinelAlert! | Integrated analog monitoring subsystem with ADC/DAC, GPIO, and one-pin temperature sensor links-enabling autonomous thermal/fail-safe response |
| Standby Power Reset Generator | RESGEN monitors VCC1 and asserts internal reset and VCC1RST# to synchronize flash memory reset during power-up sequences |
Applications
| Laptop System Power Management | Embedded Industrial Control Panel |
|---|---|
Use Scenario: Real-time thermal monitoring and fan speed regulation in ultraportable notebooks with battery-backed wake timers. IC Role / Device Role / Timing Role: KBC1122-AJZS acts as system-level power arbiter and analog monitor, coordinating host CPU suspend/resume with thermal events and battery state. Use Value: Enables autonomous thermal shutdown via HW_PROTECT# and precise 8-channel ADC sampling at 20ms intervals without host intervention. | Use Scenario: Human-machine interface (HMI) with PS/2 keyboard/mouse, IR remote control, and analog sensor feedback in factory automation panels. IC Role / Device Role / Timing Role: KBC1122-AJZS serves as centralized I/O controller handling PS/2, CIRCC2.0 (NEC/RC5), SMBus sensors, and PWM-driven indicators. Use Value: Delivers 92 GPIOs, dual IR ports, and 36 hardware wake sources-reducing external logic and enabling deterministic wake latency under 100μs. |
| BIOS Recovery Platform | Mobile Thin Client Terminal |
Use Scenario: Secure, hardware-redirected BIOS update and fallback execution in enterprise-managed laptops after corrupted flash writes. IC Role / Device Role / Timing Role: KBC1122-AJZS manages SFI arbitration, host flash address redirection, and shadowed register access to isolate recovery code from main BIOS. Use Value: Supports 128KB legacy BIOS addressing and 16MB FWH register mapping-enabling dual-image storage and atomic switch between primary/backup firmware. | Use Scenario: Low-power thin client booting from network or local flash with keyboard, serial console, and environmental monitoring. IC Role / Device Role / Timing Role: KBC1122-AJZS integrates UART (16550A-compatible), SMBus controllers, ADC/DAC, and watchdog timer into single-chip system management. Use Value: Provides 16-byte FIFO UART, 32KB flash-accessible 8051 code space, and hibernation timer with 0.5ms–128min programmability for extended idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar keyboard/system controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ITE IT8786E | Single 3.3V supply; no dual power plane; lacks SFI interface and SentinelAlert! DAC; 128-pin QFP package | Targeted at desktop motherboards with simpler power sequencing; no battery-backed hibernation timer or hardware thermal alert output | Choose IT8786E when SFI flash arbitration and autonomous thermal protection are not required |
| Nuvoton NCT6776D | Integrated 8051 core; supports LPC but no FWH interface; 8-channel ADC only (no DAC); 128-pin LQFP package | Focused on server/platform controller hub integration; lacks IRCC/CIRCC and PS/2 edge-wake capability | Choose NCT6776D for server BMC applications where IR and PS/2 wake are unnecessary |
Compared with IT8786E and NCT6776D, the KBC1122-AJZS uniquely combines SFI flash arbitration, dual-power-plane operation, hardware thermal alert (HW_PROTECT#), and integrated IR/PS/2 wake-making it the only option for mobile platforms requiring BIOS recovery, instant-on, and fail-safe thermal response without host CPU dependency.
Availability
KBC1122-AJZS is available at Aetrix Electronics and suitable for laptop system power management, embedded industrial HMI, BIOS recovery platforms, and mobile thin client terminals requiring stable component supply and long-term lifecycle support.
Supply support for KBC1122-AJZS 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
Standard Microsystems Corporation (SMSC) was a fabless semiconductor company specializing in connectivity, embedded control, and system management ICs before its acquisition by Microchip Technology in 2012.
The KBC1122-AJZS belongs to SMSC's Mobile Keyboard/Controller product line, designed specifically for power-constrained portable systems requiring integrated Super I/O, flash management, analog monitoring, and autonomous thermal safety.
FAQ
What is the primary function of the KBC1122-AJZS in a laptop platform?
The KBC1122-AJZS serves as the central keyboard/system management controller, integrating an 8051 microcontroller, LPC interface, Super I/O functions, Shared Flash Interface (SFI), and Direct Battery Management with SMSC SentinelAlert!. In laptops, it handles PS/2 keyboard/mouse, thermal monitoring via its 8-channel ADC, fan control using its 3-channel DAC, and autonomous hardware-level thermal shutdown through the HW_PROTECT# signal-without requiring host CPU intervention. This enables reliable power management and fail-safe operation critical for mobile platforms.
Does the KBC1122-AJZS support both LPC and Firmware Hub (FWH) interfaces?
Yes, the KBC1122-AJZS supports both LPC and Firmware Hub interfaces. Its LPC interface complies with ACPI 1.0b/2.0 and PC99a/PC2001 standards and includes Clock Run support, Serial IRQ, and nSMI. The FWH interface provides single-byte memory read/write, FWH ID support, and 16MB addressing-enabling direct communication with host flash memory for BIOS updates and recovery operations. The KBC1122-AJZS uses this to implement host flash address redirection and shadowed write-only registers for secure firmware management.
What distinguishes the KBC1122-AJZS from the KBC1122P-AJZS variant?
The KBC1122P-AJZS adds RC6 infrared framing support under Philips license, which the KBC1122-AJZS does not include. Both share identical pinout, package (156-pin DQFN), LPC/FWH interface, SFI, ADC/DAC, and power management features. The KBC1122-AJZS supports NEC and RC5 framing only, while the KBC1122P-AJZS extends CIRCC2.0 to handle RC6 frames and provides 8051 access to RC6-received data. All other specifications-including 92 GPIOs, triple PS/2, SMBus controllers, and HW_PROTECT#-are functionally identical between the two parts.
How does the SFI (Shared Flash Interface) operate in the KBC1122-AJZS?
The SFI in the KBC1122-AJZS provides hardware-arbitrated access to up to 8MB of shared flash memory between the host CPU and the embedded 8051 core. It supports 0.5–8MB capacity, 32KB page-based code space accessible to the 8051, low-power flash access modes, and 8051-programmable read/write/no-access protection per bank. The interface includes host flash address redirection for BIOS recovery and supports both 8051-driven and host-driven flash programming-enabling robust, fail-safe firmware updates without requiring host CPU execution during critical recovery sequences.
What power management capabilities does the KBC1122-AJZS offer for mobile designs?
The KBC1122-AJZS implements a dual-power-plane architecture (VCC1/VCC0) enabling true instant-on and ultra-low-standby-current operation. It supports IDLE, SLEEP, and hibernation modes with programmable wake-up intervals from 0.5ms to 128 minutes. Its fail-safe ring oscillator maintains ±10% accuracy during power transitions, and the Standby Power Reset Generator (RESGEN) ensures synchronized reset of internal logic and external flash memory (via VCC1RST#). These features allow mobile systems to maintain responsiveness while minimizing battery drain during suspend states-critical for ultraportable and always-on devices.
KBC1122-AJZS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 156-VFQFN Dual Rows, Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- LPC
- Voltage - Supply:
- -
- Supplier Device Package:
- 156-DQFN (12x12)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
KBC1122-AJZS FAQ
1.How can I place an order for KBC1122-AJZS through Aetrix?
Please submit a Request for Quotation (RFQ) for KBC1122-AJZS 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 KBC1122-AJZS reliable?
The price and inventory of KBC1122-AJZS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KBC1122-AJZS is usually 5 days.
3.What payment methods are accepted for KBC1122-AJZS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KBC1122-AJZS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KBC1122-AJZS?
KBC1122-AJZS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KBC1122-AJZS 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 KBC1122-AJZS?
For technical support, including KBC1122-AJZS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KBC1122-AJZS requirements.
6.How does Aetrix verify that KBC1122-AJZS is sourced from the original manufacturer or authorized distributors?
All KBC1122-AJZS 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 KBC1122-AJZS meets industry standards.
7.What is the process for return or replacement of KBC1122-AJZS?
All KBC1122-AJZS units undergo pre-shipment inspection (PSI). If there is an issue with KBC1122-AJZS, 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 KBC1122-AJZS part is unused and in its original packaging.
Return procedure for KBC1122-AJZS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KBC1122-AJZS Tags
-
NVT4857UKAZ
NXP Semiconductors
-
TCA8418RTWR
Texas Instruments
-
PCA9546APWR
Texas Instruments
-
MD0100N8-G
Microchip Technology
-
PCA9548APW,118
NXP Semiconductors
-
PCA9540BDP,118
NXP Semiconductors
-
PCA9548APWR
Texas Instruments
-
PCA9546APW,118
NXP Semiconductors
-
PTN3360DBS,518
NXP Semiconductors
-
PCA9546ABS,118
NXP Semiconductors
-
PCA9518PWR
Texas Instruments
-
PCA9545APW,118
NXP Semiconductors
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…
