| Parameter | Symbol | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | | V_VBUS | 4.75 | - | 5.5 | V | | Operating Temperature | T_OP | -40 | - | +85 | °C | | Internal Clock Frequency | f_CLK | - | 32 | - | MHz |
: A flexible flat cable (FFC) connecting the programmer directly to the motherboard's keyboard connector. Flashing Workflow
| Parameter | Description / Value | |-----------|----------------------| | | ITE Tech. Inc. | | Part Number Variants | IT8995E‑128 CXA / DXA / CXS (different firmware/configurations) | | Package Type | TQFP‑128 (128‑pin Thin Quad Flat Package), body size 14×14 mm (QFP‑128) | | Core Function | Programmable Super I/O / Embedded Controller (EC) | | Supply Voltage (VCC) | 3.3V (typical) | | Integrated Flash Memory | 128 KB (hence the “-128” suffix) – holds the EC firmware | | Programmability | Fully programmable – requires a pre‑programmed firmware file | | Supported Interfaces | LPC (Low Pin Count), SPI (for BIOS communication), SMBus, GPIO | | Temperature Range | Industrial: -40°C to +85°C (typical) | | Clock Source | External 32.768 kHz crystal or internal oscillator | | Common Companion Chips | Winbond 25Q64 series SPI flash, BQ24780S charger, Realtek ALC3251 audio codec | it8995e 128 datasheet
: Liquid spills often short the keyboard lines, pulling internal GPIO pins low and causing erratic behavior or boot loops.
Analog power supply for the internal Analog-to-Digital Converters (ADC). GND / AGND: Digital and analog ground reference lines. Communication Interfaces | Parameter | Symbol | Min | Typ
Signals to the system that all major voltage rails are stable. 4. Hardware Repair & Troubleshooting Guide
Load a verified clean factory EC firmware file matching your specific motherboard board number, erase the chip, and execute the write command. | | Part Number Variants | IT8995E‑128 CXA
Generates PWM signals to dynamically control cooling fan speeds based on thermal loads.
The IT8995E-128 is highly susceptible to damage due to its exposure to external ports (keyboard spills, charging port surges). Symptoms of a Failing IT8995E-128
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.