HT82K629A Datasheet, PDF (1/23 Pages) Holtek Semiconductor Inc – Windows 2000 USB+PS/2 Keyboard Encoder

HT82K629A
Windows 2000 USB+PS/2 Keyboard Encoder
Features
· Operating voltage: 4.4V~5.5V
· Operating frequency: f_SYS=6M
· Design for Windows 95/98/NT/2000/XP
· Phantom key detection
· Low voltage reset function
· USB and PS2 modes supported
· Auto detect USB or PS2 interface
· USB 1.1 low speed function
· Supports PS2 code set 1 and code set 2
· Supports multimedia key
· Supports ACPI key
· Supports mini-keyboard with Fn key
· Built-in Watchdog Timer
· HALT function and wake-up feature for USB mode to
reduce power consumption
· 40-pin DIP package
General Description
The HT82K629A can function both in USB and PS2 in-
terface environment. For PS2 interface, it supports IBM
PC/AT, IBM PS/2 and all compatible machines and pro-
vides a 16-character first-in-first-out buffer in which data
Block Diagram
is stored. For USB interface, it can support the USB
standard request as well as HID class request version
1.1.
U S B D + /P S 2 C L K
U S B D -/P S 2 D A T A
V 33O
O SC1
O SC2
VDD
VSS
USB
T r a n s c e iv e r
USB
R e c e iv e r
USB
T r a n s m itte r
V o lta g e
R e g u la to r
C lo c k
G e n e ra to r
R C R eset
R e g is te r S e t
U S B S e r ia l
In te r fa c e E n g in e ( S IE )
& C o n tr o l L o g ic
H o lte k 8 - b it
M ic r o c o n tr o lle r
M a in
S ta te M a c h in e
S uspend
C o n tro l
F IF O s
Rev. 1.30
1
April 16, 2004