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EKK8011AB

USB & PS/2 Keyboard Encoder

ELAN Microelectronics 

eKK8011AB

USB and PS/2 Keyboard Encoder

1 General Description

The eKK8011A/eKK8011B series are high performance CMOS microcontroller devices

specially designed for keyboard encoder applications. These devices function both in

USB and PS/2 interface environment. For PS/2 interface, it supports IBM PC AT and

all compatible machines and provides a 16-character first-in-first-out buffer in which

data is stored. For USB interface, it supports the USB standard request version 1.1 as

well as HID class request version 1.1.

The eKK8011A/B controls all scan codes, three LED status, scan timing and

communications between the keyboard and PC. Enhanced features combine to

ensure easy implementation of a high performance, low cost keyboard with minimal

external components.

The eKK8011A MCU is compatible with EM78M611 and the eKK8011B MCU is

compatible with EM78611.

2 Features

USB Specification Compliance

• Universal Serial Bus Specification Version 1.1

• USB Device Class Definition for Human Interface Device (HID), Firmware

Specification Version 1.1

Low cost : no external components required

Operating frequency: 6MHz

Phantom key detection

Support scan code Set 1, 2 and 3 for PS/2

Support HID Usage ID for USB

Support PC PS/2 and USB keyboard

Support USB Sleep Mode

Low power CMOS device technology

Internal pull-up resistor

Tri-state outputs for easy board application

Support Windows1 TM 95, 98, 2000, ME keys

Support multi-media or other special application keyboard encoder

3 Applications

USB Keyboard only

Both USB and PS/2 compatible Keyboards

1 Windows is a registered trademark of Microsoft Corporation.

Product Specification (V1.4) 07.10.2006

•1

(This specification is subject to change without further notice)

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