Features
·
Complete Universal Serial Bus specifica
tion compatibility
·
Serial Bus Interface Engine (SIE)
·
USB transceiver
·
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)
General Description
HT82M91A is a 3D mouse encoder chip espe
cially designed for USB applications. The
HT82M91A can support the USB Standard Re
quest as well as HID Class Request version 1.0.
It can be briefly described as a Holtek 8-bit mC
Block Diagram
HT82M91A
3D USB Mouse
·
-
-
-
-
Single chip solution especially for USB
mouse function
·
Halt function and wake-up feature reduce
power consumption
·
Has plug and Play functions
·
Minimal external components
·
6MHz crystal oscillator for system clock
·
18-pin DIP package
with an on-chip USB interface logic. It can use
minimal external components to implement
three key-switches and four photo-coupler
mouse. The USB is specified by the Universal
Serial Bus Specification.
USBD+
USBD
V33O
OSC1
OSC2
USB
Transceiver
USB
Receiver
-
USB
Transm itter
Voltage
R egulator
Clock
G enerator
RC
RESET
R egister
Set
USB Serial
Interface Engine
(S IE )
and
C ontrol
Logic
M ain
State m achine
Suspend
C ontrol
1 January 28, 2000
Holtek
8-bit
M icro c o n tro lle r
FIFO s´2
VDD
VSS
Pin Assignment
HT82M91A
VSS
V33O
USBD+
USBD
RESET
X1
X2
Y1
Y2
1
2
3
-
4
5
6
7
8
9
OSC1
18
OSC2
17
VDD
16
LED
15
M
14
R
13
L
12
Z2
11
Z1
10
HT82M 91A
1 8 D IP
Pin Description
Pin No. Pin Name I/O Description
USB Interface (2 pins)
3 USBD+ I/O USB data plus
4
USBD-
General purpose I/O (9 pins)
6, 7 X1, X2 I
8, 9 Y1, Y2 I
10, 11 Z1, Z2 I
12, 13,
14
L, R, M I
Miscellaneous (7 pins)
1 VSS
2 V33O O 3.3V voltage output
5 RESET
15 LED I/O Drives LED output
16 VDD
17 OSC2 O 6MHz OSC output
18 OSC1 I 6MHz OSC input
I/O USB data minus
X-axis photo input with built-in Holtek's special dynamic photo in
put resistor
Y-axis photo input with built-in Holtek's special dynamic photo input resistor
Z-axis input supports two kinds of scroller input; optomechanical
and mechanical
These pins are input port with pull-high resistor. These pads can
function as Left, Right and Middle button input lines.
Negative power supply, ground
¾
I Chip reset input, low active
5V positive power supply
¾
-
2 January 28, 2000
Absolute Maximum Ratings
HT82M91A
Supply Voltage .................................-0.3V to 6V
mC Input Voltage ...........V
USB Input Voltage .......V
-0.3V to VDD+0.3V
SS
-0.3V to V
SS
33O
+0.3V
Storage Temperature.................-50°Cto125°C
Operating Temperature ..............-25°Cto70°C
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=25°C
Test Conditions
Symbol Parameter
V
I
I
V
V
V
V
V
V
I
I
I
DD
DD
STB
IL1
IH1
IL2
IH2
IH3
POR
OL1
OH1
OL2
Operating Voltage
Operating Current
(Crystal OSC)
Standby Current 5V No load, system Halt
Input Low Voltage for I/O
Ports
Input High Voltage for mC
I/O Ports
Input Low Voltage (RESET)5V
Input High Voltage (RESET)5V
Input High Voltage for USB
I/O Ports
Power on Reset V
DD
Detecting Voltage
Output Port Sink Current 5V
Output Port Source Current 5V
Outpu Ports Sink Current
(LED)
V
DD
Conditions
¾¾
5V
5V
5V
No load, f
SYS
¾
¾
=6MHz
¾
¾
3.3V
5V
5V
V
OL
V
OL
V
OL
¾
¾
=0.5V
=4.5V
=4.5V
Min. Typ. Max. Unit
4.5
¾
¾¾
0
3.5
0
3.5
2.8
3
¾
¾-4 ¾
¾
¾
10
¾
¾
¾
¾
¾
¾
4
50
5.5 V
mA
¾
250
mA
1.0 V
5V
1.8 V
5V
3.6 V
3.6 V
mA
¾
mA
mA
¾
-
-
3 January 28, 2000
HT82M91A
A.C. Characteristics
Symbol Parameter
f
SYS
t
WDTosc
t
WDT
t
PWRT
t
OST
Note: t
System Clock (Crystal OSC) 5V
Watchdog Oscillator
Watchdog Time-out Period
(RC OSC)
Power-up Timer Period
Oscillation Start-up Timer
Period
=1/f
SYS
SYS
Test Conditions
Min. Typ. Max. Unit
V
DD
¾¾
¾¾
Conditions
¾
0 6000
93.75 125 156.25
768 1024 1280 ms
¾¾¾10¾
Power-up or wake-up
¾
form Halt
¾
1024
¾
¾
Ta=25°C
kHz
ms
ms
t
SYS
4 January 28, 2000
Application Circuits
C
1k
W
0.1mF
0.1mF
1M
1.5k
W
W
RECEPT_A
2
3
4
1
1
VSS
2
V33O
3
USBD+
4
USBD
5
RESET
6
X1
7
X2
8
Y1
9
Y2
H T82M 91A
HT82M91A
V
C
18
OSC1
OSC2
VDD
LED
-
M
R
L
Z2
Z1
6M H z
17
16
15
14
13
12
11
10
1k
W
V
CC
1M
W
RECEPT_A
2
3
4
0.1mF
1.5k
W
0.1mF
1k
W
1
1
VSS
2
V33O
3
USBD+
4
USBD
5
RESET
6
X1
7
X2
8
Y1
9
Y2
H T82M 91A
18
OSC1
OSC2
VDD
LED
-
M
R
L
Z2
Z1
6M H z
17
16
15
14
13
12
11
10
Encoder
EVZV X C 00112B
5 January 28, 2000
HT82M91A
Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (International sales hotline)
Holtek Semiconductor (Hong Kong) Ltd.
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: 852-2-745-8288
Fax: 852-2-742-8657
Copyright Ó 2000 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
6 January 28, 2000
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