HT82K629A
Windows 2000 USB+PS/2 Keyboard Encoder
Features
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Operating voltage: 4.4V~5.5V
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Operating frequency: f
SYS
=6M
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Design for Windows 95/98/NT/2000/XP
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Phantom key detection
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Low voltage reset function
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USB and PS2 modes supported
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Auto detect USB or PS2 interface
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USB 1.1 low speed function
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Supports PS2 code set 1 and code set 2
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Supports multimedia key
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Supports ACPI key
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Supports mini-keyboard with Fn key
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Built-in Watchdog Timer
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HALT function and wake-up feature for USB mode to
reduce power consumption
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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
is stored. For USB interface, it can support the USB
standard request as well as HID class request version
1.1.
Block Diagram
U S B
T r a n s c e iv e r
U S B D + /P S 2 C L K
U S B D -/P S 2 D A T A
U S B
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
M a in
S ta te M a c h in e
S u s p e n d
C o n tro l
U S B
R e c e iv e r
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
R e g is te r S e t
V 3 3 O
O S C 1
O S C 2
V D D
V S S
F IF O s
R C
R e s e t
Rev. 1.30
1
April 16, 2004