In a schematic, the IT8995E is usually surrounded by:
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).
Here's a brief overview:
When industrial PCs need parallel printers, legacy serial devices (RS-232), or PS/2 keyboards, designers integrate the IT8995E 128. The datasheet provides the register maps to initialize these ports via the BIOS. it8995e 128 datasheet
If a motherboard fails to post or display a signal after a chip swap (e.g., full fan spin but a completely blank screen), the EC may require manual programming.
Unlike older, fixed-function Super I/O chips, the IT8995E-128 is fully . This means its behavior is determined entirely by the firmware flashed onto it.
If you measure 0V on pins , 4 (PM_SUSC#) , and 5 (INT_SERIRQ) while the power button ( PWR_SW# ) is functioning and the EC has power, it strongly indicates a corrupted EC firmware or a faulty chip. In a schematic, the IT8995E is usually surrounded
The fan spins at maximum speed constantly, or never spins up, causing the laptop to overheat and shut down. Diagnostic Steps:
The chip exists in multiple hardware revisions noted in component schematics, such as the CXA , CXS , and DXA variants. These designations generally share core compatibility but may have minor structural optimizations. Key Technical Specifications
The suffix "" denotes the internal 128 KB programmable flash memory. Unlike older controller chips that read firmware from the main BIOS chip, the IT8995E-128 stores its own operating code. If this firmware corrupts, or if you replace a burned chip with a brand-new blank one, you must flash it. Required Tools Here's a brief overview: When industrial PCs need
The IT8995E-128 communicates directly with the Southbridge, PCH (Platform Controller Hub), or CPU SoC using standard ACPI states:
| Parameter | Details | Source/Analysis | | :--- | :--- | :--- | | | Single-Chip USB-C PD Controller with PMIC | Utsource Listing | | Package Type | QFN-40 (6x6mm) OR TQFP-128 (14x14mm) | Note: Two conflicting package variants exist based on application | | Operating Voltage | 4.75V to 5.5V (VBUS Input Range) | Utsource Listing | | Temperature Range | -40°C to +85°C (Industrial Grade) | Utsource Listing | | Embedded Memory | 128KB Embedded Flash Memory | Utsource Listing; Verified by KBC Dump size | | USB Support | USB PD 3.0, USB 2.0 & 3.2 | Utsource Listing | | GPIO | 16 General Purpose I/O Pins | Utsource Listing | | Protection | Overcurrent (OCP), Overvoltage (OVP), Overtemperature (OTP) | Utsource Listing | | Maximum Power | Supports up to 100W output power via integrated buck converter | Utsource Listing |
The most likely reason is that the IT8995E-128 was designed as a custom component for a specific major OEM, most probably ASUS . In such business relationships, the datasheet is provided directly to the customer under a non-disclosure agreement. It is never intended for public release, which is why it is so difficult to locate on ITE’s official website.