HT82M98A
3D USB+PS2 Mouse
1
June 14, 2000
Features
Complete Universal Serial Bus specs V1.0
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 three
axes (X, Y, Z) input
Z axis can support two kinds of scroller in-
put (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
18-pin DIP package
General Description
HT82M98A is a 3D mouse controller especially
designed for USB and PS/2 applications. The
HT82M98A can support the USB Standard Re-
quest as well as HID Class Request version 1.0
draft 4. It is compatible with Microsoft Intelli
3D PS/2 mouse. The X/Y axis photo input with
built-in Holteks special dynamic photo-input
resistor and Z axis can support two kinds of
scroller input, namely; optomechanical and
mechanical. It requires minimal external com-
ponents to implement 3D USB plus PS/2
mouse. It can be briefly described as a Holtek
8-bit mC with an on-chip USB interface logic.
The USB is specified by the Universal Serial
Bus Specification V1.0.
Block Diagram
Pin Assignment
HT82M98A
2
June 14, 2000
U S B
T r a n s c e i v e r
U S B
R e c e i v e r
U S B
T r a n s m i t t e r
V o l t a g e
R e g u l a t o r
C l o c k
G e n e r a t o r
R C
R E S E T
R e g i s t e r
S e t
U S B S e r i a l
I n t e r f a c e E n g i n e
( S I E )
a n d
C o n t r o l
L o g i c
M a i n
S t a t e m a c h i n e
S u s p e n s i o n
C o n t r o l
H o l t e k
8 - b i t
M i c r o c o n t r o l l e r
F I F O s 2
U S B D +
U S B D -
V 3 3 O
O S C 1
O S C 2
V D D
V S S
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
1 0
1
2
3
4
5
6
7
8
9
V S S
V 3 3 O
U S B D + / C L K
U S B D - / D A T A
R E S E T
X 1
X 2
Y 1
Y 2
O S C 1
O S C 2
V D D
L E D
M
R
L
Z 2
Z 1
H T 8 2 M 9 8 A
1 8 D I P
Pin Description
Pin No. Pin Name I/O
Description
USB Interface (2 pins)
3
USBD+/
CLK
I/O USB data plus or PS2 Clock, F/W auto-detect USBD+ for USB, CLK
for PS2
4
USBD-/
DATA
I/O USB data minus or PS2 Data, F/W auto-detect USB- for USB, DATA
for PS2
General purpose I/O (9 pins)
6, 7
X1, X2
I
X-axis photo input with built-in Holtek's special dynamic photo in-
put resistor
8, 9
Y1, Y2
I
Y-axis photo input with built-in Holtek's special dynamic photo in-
put resistor
10, 11
Z1, Z2
I
Z-axis input supports two kinds of scroller input; optomechanical
and mechanical
12, 13,
14
L, R, M
I
Input ports with pull-high resistor. These pads can function as Left,
Right and Middle button input lines.
Miscellaneous (7 pins)
1
VSS
Negative power supply, ground.
2
V33O
O 3.3V voltage output
5
RESET
I
Chip reset input, low active
15
LED
I/O Drives LED output
16
VDD
5V positive power supply
17
OSC2
O 6MHz OSC output
18
OSC1
I
6MHz OSC input
HT82M98A
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June 14, 2000
Absolute Maximum Ratings
Supply Voltage.................................-0.3V to 6V
Storage Temperature.................-50C to 125C
mC Input Voltage ...........V
SS
-0.3V to V
DD
+0.3V
Operating Temperature ..............-25C to 70C
USB Input Voltage .......V
SS
-0.3V to V
33O
+0.3V
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-
mum Ratings" may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo-
sure to extreme conditions may affect device reliability.
D.C. Characteristics
Ta=25C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
V
DD
Operating Voltage
4.5
5.5
V
I
DD
Operating Current
(Crystal OSC)
5V
No load,
f
SYS
=6MHz
USB mode
10
mA
PS/2 mode
3
mA
I
STB
Standby Current
5V No load,
system HALT
250
mA
V
IL1
Input Low Voltage for I/O
Ports
5V
0
1.0
V
V
IH1
Input High Voltage for mC
I/O Ports
5V
3.5
5
V
V
IL2
Input Low Voltage
(RESET)
5V
0
1.5
V
V
IH2
Input High Voltage
(RESET)
5V
3.5
5
V
V
IH3
Input High Voltage for
USB I/O Ports
3.3V
2.8
3.6
V
V
POR
Power on Reset V
DD
Detection Voltage
5V
3.5
3.9
V
I
OL1
Output Port Sink Current 5V V
OL
=0.5V
4
mA
I
OH1
Output Port Source
Current
5V V
OL
=4.5V
-4
mA
I
OL2
Output Port Sink Current
(LED)
5V V
OL
=4.5V
50
mA
HT82M98A
4
June 14, 2000
A.C. Characteristics
Ta=25C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
f
SYS
System Clock (Crystal OSC) 5V
0
6000
kHz
t
WDTosc
Watchdog Oscillator
80
100
120
ms
t
WDT
Watchdog Time-out Period
(RC OSC)
768
1024 1280
ms
t
PWRT
Power-up Timer Period
10
ms
t
OST
Oscillation Start-up Timer
Period
Power-up or wake-up
form HALT
1024
t
SYS
Note: t
SYS
=1/f
SYS
HT82M98A
5
June 14, 2000
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