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
| Parameter | Value / Description | | :--- | :--- | | Part Number | IT8995E-128 | | Manufacturer | ITE Tech Inc. | | Core Logic | High-performance RISC (EC specific) | | Program Memory | 128 KB Internal Flash | | Package | 128-pin LQFP | | Interface | LPC Bus, SMBus, I2C, SPI (for debugging) | | Operating Voltage | 3.3V (Typical) | | Standby Current | < 1 mA (Critical for battery life) | | Temperature Range | Commercial (0°C to 70°C) or Industrial | The IT8995E-128 is a highly integrated Super I/O
| Pin Group | Pins | Description | |-----------|------|-------------| | VCC (3.3V) | 22, 45, 78, 101 | Main digital power | | VCC_RTC | 32 | Real-time clock backup (2.0V–3.3V) | | VBAT | 33 | Battery backup for CMOS RAM | | XIN / XOUT | 88, 89 | 32.768 kHz crystal input/output | | VSS (GND) | 11, 30, 55, 72, 95, 120 | Multiple grounds for noise reduction | Sample Configuration Register (CR_24 – Power Management):
Important: The IT8995E-128 requires a 32.768 kHz real-time clock crystal for power management timers. Without it, S3/S5 wake-up events fail.
Unlike older ECs that used 8051 cores, the IT8995E series typically utilizes a 32-bit RISC-V or ARM Cortex-M architecture (depending on the specific silicon revision) to handle modern ACPI (Advanced Configuration and Power Interface) demands.