It8995e - 128 Datasheet

// Example: Enable UART1 at 0x3F8, IRQ 4
WriteByte(0x2E, 0x87); // Enter config mode
WriteByte(0x2F, 0x01);
WriteByte(0x2E, 0x07); // LDN 0x04 = UART1
WriteByte(0x2F, 0x04);
WriteByte(0x2E, 0x30); // Activate LDN
WriteByte(0x2F, 0x01);
WriteByte(0x2E, 0x60); // Base address MSB
WriteByte(0x2F, 0x03);
WriteByte(0x2E, 0x61); // Base address LSB
WriteByte(0x2F, 0xF8);
WriteByte(0x2E, 0x70); // IRQ
WriteByte(0x2F, 0x04);
WriteByte(0x2E, 0xAA); // Exit config mode

The IT8995E-128 is a highly integrated Super I/O (Input/Output) controller manufactured by ITE (Integrated Technology Express, Inc.). This chip is a cornerstone of modern motherboard design, particularly for industrial PCs, embedded systems, and high-end consumer laptops. Unlike basic I/O controllers, the IT8995E-128 bridges legacy interfaces (PS/2, LPC, UART) with advanced system management features.

This article consolidates the critical information from the IT8995E-128 datasheet, including electrical characteristics, pin configuration, functional blocks, and application circuits. Whether you are reverse-engineering a motherboard, developing BIOS firmware, or sourcing components for a repair, this guide serves as a practical datasheet companion.

IT8995E-128 Datasheet Write-up

Overview

The IT8995E-128 is a highly integrated, low-power, and cost-effective embedded controller designed for various applications, including industrial control, automation, and IoT devices. This write-up provides an in-depth analysis of the IT8995E-128 datasheet, highlighting its key features, specifications, and potential applications.

Key Features

Specifications

| Parameter | Value | | --- | --- | | CPU Core | ARM Cortex-M4 | | Maximum Frequency | 120 MHz | | Flash Memory | 128 KB | | SRAM | 32 KB | | Operating Voltage | 2.7V to 5.5V | | Temperature Range | -40°C to 85°C | | Package | LQFP-48 | it8995e 128 datasheet

Potential Applications

The IT8995E-128 is suitable for a wide range of applications, including:

Conclusion

The IT8995E-128 is a highly integrated and versatile embedded controller that offers a rich set of peripherals, low power consumption, and a compact package. Its robust design and wide operating temperature range make it suitable for harsh industrial environments. With its ARM Cortex-M4 core and ample memory, the IT8995E-128 is an ideal choice for a wide range of applications, from industrial control and automation to IoT devices.

The ITE IT8995E-128 is a high-performance Embedded Controller (EC) and Keyboard Controller (KBC) designed primarily for notebook motherboards. It plays a critical role in managing low-level hardware functions, including power sequencing, thermal monitoring, and peripheral interfaces. Core Technical Specifications

The IT8995E-128 is characterized by its integration of essential system management tasks into a single, compact logic IC. Manufacturer: ITE Tech. Inc.

Package Type: LQFP-128 (Low Profile Quad Flat Package) with 128 pins // Example: Enable UART1 at 0x3F8, IRQ 4

Programmable Memory: Internal 128KB programmable eFlash (Embedded Flash)

Key Revisions: CXA, CXS, and DXA; these are often interchangeable in many motherboard schematics (e.g., CXA/CXS can often replace "IT8995E-128 CX" models). Primary Functions and Applications

As a "Super I/O" or Embedded Controller, the chip serves as the hardware supervisor for the following systems:

Input Management: Interfaces with the laptop keyboard and touchpad.

Power Sequencing: Manages the boot process and power states of the motherboard.

Battery & Charging: Oversees battery charge management and monitoring.

Thermal Control: Handles fan control and monitors temperature sensors through dedicated internal registers. Repair and Programming Requirements The IT8995E-128 is a highly integrated Super I/O

In professional repair scenarios, the IT8995E-128 is a common target for replacement when a laptop fails to power on or has keyboard/thermal issues.

Programming Need: The chip contains a programmable section. While some motherboards (especially ASUS models) may automatically pull the required firmware from the BIOS upon first boot, others require manual programming using an EC ROM I/O Programmer after soldering.

Component Sourcing: New and refurbished units are available through specialized electronics distributors such as IC-Components and Zeus Mining.

Replacement Advice: Technicians recommend verifying the specific part number and revision (CXA, CXS, etc.) against the motherboard's boardview or schematic to ensure compatibility before installation.

For detailed pinout diagrams and register maps, users often refer to motherboard schematics for specific laptop models, as a full standalone public datasheet from ITE can be difficult to find outside of NDAs. IT8995E-128/CXA ITE - IC Components

| Feature | IT8995E 128 | IT8728F (Desktop) | NCT6779D (Winbond) | | :--- | :--- | :--- | :--- | | Package | 128-LQFP (Tiny) | 128-LQFP (Larger) | 128-LQFP | | Primary Market | Laptop EC | Desktop Motherboard | Gaming/Workstation | | Built-in EC Core | Yes (8051) | No (Simple I/O) | Yes (ARM-based) | | Hardware Monitor | 12 Channels | 6 Channels | 15 Channels | | Common Failure | Power sequencing | Serial port damage | Fan controller burnout |

The IT8995E 128 is superior for mobile applications due to its power-saving standby modes, detailed in Section 7.2 of the datasheet.