It8995e 128 Datasheet Best Now
The IT8995E-128 is an embedded multi-controller (EC) manufactured by ITE Tech. Inc., commonly used in laptops and personal electronics for power management, keyboard control, and system monitoring. It is a high-performance integrated circuit (IC) known for balancing power efficiency with complex task handling. Technical Overview
12. Design Considerations & Errata (from datasheet)
- Power sequencing: VCC must rise before LPC_VREF to avoid latch-up.
- PCB layout: Keep LPC traces (LAD0-3, LFRAME#) length-matched within 2 inches.
- Known errata: Revision A0 – UART2 FIFO threshold interrupt may glitch; fixed in B0.
Specifications
Memory: Includes 128KB of internal Flash Memory, allowing for firmware storage directly on the chip. it8995e 128 datasheet
- KBC Interface:
KBCLKandKBDATfor PS/2 devices. - GPIO Matrix: Up to 128 general-purpose I/O pins (hence the suffix) that can be muxed for power sequencing, lid switches, or LED control.
Safety Features: Built-in electrostatic discharge (ESD) protection and overheating safeguards. Primary Functions in Laptops Power sequencing: VCC must rise before LPC_VREF to
- Clock Speed: Operates typically in the range of 24 MHz to 48 MHz.
- Internal Flash: The "-128" suffix usually denotes 128 KB of internal flash memory for storing the EC firmware. This allows manufacturers to update the EC logic via BIOS updates.
- RAM: Integrated SRAM (typically 4KB to 8KB) for run-time variables and stack.
3. Pinout and Interface Analysis
The IT8995E is typically housed in a LQFP (Low-profile Quad Flat Package) with 128 pins. Specifications Memory : Includes 128KB of internal Flash
, to manage low-level power sequences and interface functions. Key Specifications Package Type : QFP-128 (128 pins). : Features 128KB e-Flash for internal programming. : Common suffixes include Application
