HT82M21A Datasheet, PDF (1/6 Pages) Holtek Semiconductor Inc – 3-Key 3D USB+PS/2 Optical Mouse Controller

HT82M21A
3-Key 3D USB+PS/2 Optical Mouse Controller
Features
· Operating voltage: 4.4V~5.25V
· Complete Universal Serial Bus specs V1.1
compatibility
· Serial Bus Interface Engine (SIE)
· USB transceiver
· Microsoft 3D Intelli mouse and IBM PS/2 mouse
compatible
· Supports three buttons (R, M, L) and Z-axis input
· Z-axis can support two kinds of scroller input
(optomechanical and mechanical)
· Single chip solution especially for USB mouse
function
· HALT function and wake-up feature reduce power
consumption
· Plug and Play functions
· Minimal external components
· 6MHz crystal oscillator for system clock
· Interface compliant with ADNS-2051, ADNS-2610
and ADNS-2620
· Pass WHQL, USB-IF and EMC testing
· 18-pin DIP package
General Description
HT82M21A is a 3D mouse controller especially de-
signed for USB and PS/2 applications. The HT82M21A
can support the USB Standard Request as well as HID
Class Request version 1.1. It is compatible with
Microsoft Intelli 3D PS/2 mouse. The Z-axis can support
two kinds of scroller input, namely; optomechanical and
mechanical. It requires minimal external components to
implement 3D USB plus PS/2 optical mouse. It can be
briefly described as a Holtek 8-bit MCU with an on-chip
USB interface logic. The USB is specified by the Univer-
sal Serial Bus Specification V1.1.
Block Diagram
USBD+
USBD-
V 33O
O SC1
O SC2
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
RC
RESET
R e g is te r
S et
U S B S e r ia l
In te r fa c e E n g in e
(S IE )
and
C o n tro 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
F IF O s ´ 2
S u s p e n s io n
VDD
C o n tro l
VSS
Rev. 1.10
1
August 4, 2004