Because this is a specialized component often sold under Non-Disclosure Agreements (NDAs) to Original Design Manufacturers (ODMs) like Lenovo, HP, Dell, and ASUS, a full public datasheet is rarely available.
Monitors the physical power button. When pressed, it triggers a chain reaction, signaling the power ICs to generate the necessary voltage rails (+3VALW, +5VALW, VCCRTC, etc.).
The hardware reset pin. It must transition from Low (0V) to High (3.3V) to release the EC from its reset state and allow firmware execution.
: Controls the power-on sequence and battery charging cycles. Thermal Control : Manages fan speeds and monitors system temperatures. Input/Output it8995e 128 datasheet
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: Match the programmer lines (KODI, KCLK, KDO2, KDO3, KSI4, KSI5) to the laptop's keyboard flexible printed circuit (FPC) connector.
Signals to the system that all major voltage rails are stable. 4. Hardware Repair & Troubleshooting Guide Because this is a specialized component often sold
: Uses the Low Pin Count (LPC) interface or the newer Enhanced Serial Peripheral Interface (eSPI) to communicate directly with the Southbridge, PCH, or CPU. Primary Functions
Finally, the power management section of the datasheet highlights the chip’s role in sleep states (S3, S4, S5). Even when the computer is “off,” the IT8995E remains partially alive, listening for a wake from a PS/2 keyboard or a ring indicator on a serial port. It manages the Power Good (PG) signals, ensuring that voltages stabilize before releasing the main CPU from reset. This low-power state operation is a testament to the chip’s efficiency; it consumes milliwatts while waiting, ready to resurrect the full system in milliseconds.
The IT8995E 128 uses pin multiplexing. Several pins serve dual functions (e.g., GP27 can act as an external thermal sensor input or a simple digital I/O). Always consult the configuration registers section of the official PDF. The hardware reset pin
In the grand theater of personal computing, the spotlight rarely falls on the supporting cast. Processors and graphics cards command the audience’s attention with staggering clock speeds and teraflops of performance. Yet, beneath the heat sinks and RGB lighting lies a silent conductor, an unsung hero that orchestrates the basic symphony of power, thermal management, and legacy I/O. This role is masterfully filled by the ITE Tech. Inc. IT8995E 128, a Super I/O (Input/Output) controller whose datasheet reveals a fascinating story of resilience, integration, and the delicate balance between modern performance and industrial necessity.
The IT8995E-128 acts as a key power IC chip, managing power sequencing during boot-up and shutdown, ensuring components receive voltage in the correct order. B. Thermal Control
Laptop motherboards (frequently found in ASUS, Lenovo, and Acer schematics).
It is important to clarify that the is not a standard general-purpose microcontroller (like an STM32 or PIC). Instead, it is a specialized Embedded Controller (EC) and Super I/O chip manufactured by ITE Tech Inc. (ITE).