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PDF SC83702 Data sheet ( Hoja de datos )
| Número de pieza | SC83702 | |
| Descripción | ALL IN ONE MOUSE CONTROLLER | |
| Fabricantes | Silan Microelectronics | |
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Silan
Semiconductors
SC83702
ALL IN ONE MOUSE CONTROLLER
DESCRIPTION
The SC83702 Mouse Controller is specially designed to control
mouse device. This single chip can interface three key-switches and
four photo-couple direct to RS-232C. The SC83702 does not need
any external power supply, so the mouse can go without a power
line. It is versatile with both microsoft and mouse system.
Debouncing circuit were provided to prevent false entry and to
improve the accuracy. In 1200 baud rate non-auto speed with 200
DPI wheels and photo-couples, the scanning is 650mm/sec without
missing a dot in microsoft mode, and the scanning speed can up to
770mm/sec in mouse system mode.
SOP-16
DIP-16
FEATURES
*Built-in two zener diode between VDD and VSS, RTS and VDD
*Built-in noise immunity circuit
*CMOS DIP 16 pins package&SOP 16 pins package
*Low power dissipation
*Use 32.768KHz crystal or 3.58MHz resonator
*Oscillator circuits on-chip
*Serial output in 1200 baud rate
*Can be powered directly from RS-232C
*Can drive directly to RS-232C
*Three key-switches and four photo-couples inputs
*Both key-in and key-release debounce interval 13ms
*Through three key-switches input,
SC83702 can exert seven different output
*The sampling rate of motion detector is
65KHz
APPLICATIONS
*Optical mouse or pen-mouse
*Mechanical mouse or pen-mouse
*Optomechanical mouse or pen-mouse
*Mechanical track ball
*Optomechanical track ball
PIN CONFIGURATIONS
RS 1
16 VDD
MS 2
15 OPT
OSCI 3
14 Y2
OSCO 4
13 Y1
SC83702A
RTS 5
12 X2
RXD 6
11 X1
VSS 7
10 L
R8
9M
RS 1
16 VDD
OPT 2
15 Y2
MS 3
14 Y1
OSCI 4
13 X2
SC83702B
OSCO 5
12 X1
RTS 6
11 L
RXD 7
10 M
VSS 8
9R
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
1
1 page  
Silan
Semiconductors
SC83702
(continued)
Pin Name
MS
OSC.IN
OSC.OUT
RTS
VSS
R
M
L
X1
X2
Y1
Y2
OPT
VDD
I/O Description
When this pin is connected to VDD, then SC83702 is assigned to operate under the
microsoft mode only. If the pin is connected to Vss, then SC83702 will operate
under the mouse system mode.
I However if this pin is "floating", then SC83702 is on the "power on initiation"
situation and if any one of three buttons is chosen, then SC83702 will operate under
the mouse mode. And while the whole system is on "power on initiation", no key is
chosen then operation will be under microsoft mode.
I A built-in inverter provides oscillation with 32.768KHz crystal or 3.58MHz resonator.
Several counters used to decrease the frequency of oscillation and create 1200
O baud rate, key-switches debounce and photo-couple sensor scanning clock, etc.
Positive power input. The signal is sent by mouse driver from computer to the
mouse to select a mode. During the reset time, SC83702 echoes the selected mode
I to the RXD line after the reset pulse signal of the RTS line. RXD will send out CD
(H) code if it is under the microsoft mode. RXD will send out two-byte C8 (H) code if
it is under the mouse system mode in SC83702.
-- Negative power input.
Three key-switches exert seven different combinations totally.
I Both key-pressed and key-released signals will be sent accompanied with horizontal
and vertical state. The status of the key-switches will be preserved, whenever the
value of horizontal or vertical counters will present at RXD. And the debounce
I/O
interval for both key-press and key-release is 13ms.
In testing mode, L and M are the outputs of motion detector. Using R key can select
I/O the two outputs X1, X2 or Y1, Y2. This feature can help manufacturer to adjust the
phase of four photo-couples for improving the yield.
Four photo-couple signals denote UP, DOWN, LEFT and RIGHT state. If SC83702
is in 1200 baud rate on non-auto speed mode, the system provides 40 transmission
cycles per second in microsoft mode to the utmost. In mouse system mode, the
I
cycles are 24 maximum. During the scanning period, as long as the photo couples
change their states, the value of vertical or horizontal counter will increase or
decrease accordingly.
I Whenever OPT is connected to VDD, the chip will enter testing mode.
-- Power
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SC83702.PDF ] | |
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