Kbc1126nu Datasheet Hot Repack (DELUXE)
The KBC1126-NU belongs to the SMSC Mobile KBC family and is housed in a 128-pin TQFP package . Key features typically found in this series include: www.jotrin.ru Processor:
: Decodes physical key strokes via rows and columns.
Under normal operating conditions, the KBC1126NU is designed to run relatively cool. As a logic controller responsible for power sequencing, battery charging, and keyboard matrix scanning, its power dissipation is minimal (typically in the milliwatt range).
| Device | Base I/O | IRQ | DMA | |--------|----------|-----|-----| | Floppy | 3F0h/370h | 6 | 2 | | Parallel | 378h/278h | 7 | 3 (ECP) | | UART A | 3F8h | 4 | - | | UART B | 2F8h | 3 | - | | KBC (keyboard) | 60h/64h | 1 | - | | KBC (mouse) | 60h/64h | 12 | - | | HWM | 290h (typical) | - | - | kbc1126nu datasheet hot
When analyzing the "hot" characteristic of the KBC1126NU, one must look at the supply voltage and current consumption specs found in technical reference manuals:
Manages standby power, reset generation (RESGEN), and power states.
Whether the laptop shows (like a standby light) or is completely dead. The KBC1126-NU belongs to the SMSC Mobile KBC
Finding a full public datasheet for this specific chip can be difficult as SMSC often restricted these documents to OEMs. However, you can find technical summaries and pinout information through the following resources: Datasheet Repositories: Preliminary data and package specs are often hosted on AllDatasheet Jotrin Electronics Inventory & Pricing: For current stock levels or procurement, sites like Win-Source
Communicates directly with the Southbridge or Platform Controller Hub (PCH) via a low pin count legacy bus structure. Troubleshooting a Burning Hot KBC1126-NU Chip
When troubleshooting a motherboard equipped with a suspect KBC1126-NU, technicians follow a structured hardware-validation checklist: KBC1126-NU Schematic Overview | PDF - Scribd As a logic controller responsible for power sequencing,
A crucial feature is that it does not have internal programmable flash memory (eFlash). It reads its firmware from an external SPI Flash (BIOS) chip. 2. Technical Features and Functionality
| Symptom | Datasheet Diagnostic | Fix | | :--- | :--- | :--- | | Chip hits 95°C, system shuts down | Check THERMAL_SHUTDOWN flag in register 0x7F | Replace C202 (10µF decoupling cap) | | Warms up only when typing | Short between ROW12 (Pin 32) and VCC | Inject 1V on pin, use thermal camera | | Instant burn on plug-in | Internal ESD clamp failed (Absolute max VCC = 3.6V) | Replace chip (KBC1126NU-F variant) |
A failed capacitor, diode, or MOSFET on the keyboard matrix or power management rails can cause the KBC to burn out, according to schematics similar to this.