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PDF SC83053 Data sheet ( Hoja de datos )
| Número de pieza | SC83053 | |
| Descripción | KEYBOARD ENCODER | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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Silan
Semiconductors
SC83053
KEYBOARD ENCODER
DESCRIPTION
The SC83053 is dedicated to a keyboard encoder, specially
designed for IBM PC AT and all compatible machines. The
SC83053 control all scan codes, three LEDs status, scan timing
and communications between the keyboard and PC. It is easy to
implement a high performance, low cost keyboard with the minimal
external components.
FEATURES
4 32
5
6
7
8
9
1 39
38
37
36
35
34
33
32
10 31
11 30
12 29
13 28
14 27
15
16 17 18 19 20 21 22 23 24 25 26
• Low cost - eliminate need external components.
• Phantom key detects.
Chip Topography
• RC oscillator (1.8432MHz ).
• Support scan code set 1, 2 and 3.
• Support PC AT and PS/2 keyboard.
• Low power CMOS device technology.
• Internal pull-up resistor.
• Tri-state outputs for easy board application.
• Built-in 4K ROM.
• Support WINDOWSTM 95, 98, 2000 keys.
• 104/107 keys with multi-media or other special application
keyboard encoder.
• WINDOWS is registered trademarks of Microsoft corperation.
APPLICATION
• IBM PC AT or compatible machine
keyboard.
• IBM PS/2 model 30,50,60,80 or
compatible machine keyboard.
• Japanese keyboard.
• Korean keyboard.
• Brazilian keyboard.
• European keyboard.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2001.11.8.
1
1 page  
Silan
Semiconductors
SC83053
FUNCTION DESCRIPTION
Keyboard buffer
The keyboard will buffer 16 bytes in a first-in-first-out order when the system is able to receive scan codes from
the keyboard. The response codes and repeated codes will not be buffered. If keystrokes generate a multiple-
byte sequence, the entire sequence must fit into the buffer or the keystroke is discarded and a buffer-overrun
condition occurs.
Power-on Reset and self test
The duration of the keyboard Power-on-Reset(POR) should be within 150 milliseconds and 2 seconds after the
power is applied to the keyboard.
After executing POR , the keyboard executes a self test. The LEDs are turned on at the beginning and off at
the end of the self test. The self test takes a minimum 300 milliseconds and a maximum 500 milliseconds. If the
self test is successful, a completion code AA hex is sent to the system and the keyboard starts scanning. If the
self test fails, and error code is sent, the keyboard is disabled and waits for a command from the system. The
completion codes are sent between 450 milliseconds and 2.5 seconds after POR, and between 300 and 500
milliseconds after a RESET command is acknowledged.
Keyboard data output
When the keyboard is ready to send data to the system, it first checks clock and data lines. If either one is in
the low state, data is stored in the keyboard buffer. If both are in the high state, keyboard starts clocking data out.
Data will be valid before the trailing edge and after the leading edge of the clock pulse. During the transmission
the keyboard checks the clock line at least every 60 microseconds . If the system lowers the clock lines before
the leading edge of the 10th clock, the keyboard should stop sending, then buffer the data and return clock and
data lines to high state.
Keyboard data input
When the system is ready to send data to the keyboard, it first checks clock line to see if keyboard is sending
data. If keyboard is not sending data or it is sending data but has not reached the 10th clock, the system can
inhibit the interface by forcing the clock line low for more than 60 microseconds and prepares to send data. The
keyboard checks clock line status at least every 5 milliseconds. If a system Request to Send (RTS) is detected,
the keyboard clocks 11 bits in. After the 10th bit, the keyboard checks for a high state in data line then pulls it low
and clocks one more bit to signal the system that data has been received. If data is low after the 10th bit, it
indicates a frame error. The keyboard should continue to count until data line goes high, then pulls it low and
issues a RESEND to the system.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2001.11.8.
5
5 Page 
Silan
Semiconductors
SC83053
Keyboard Scan Code Table
The keyboard contains 3 scan code sets. The system defaults to scan code set 2, but can be switched to set 1
or set 3 . The following tables show the key numbers and three scan code sets in hexadecimal values. All the
keys are typematics except for the pause key. When a key is pressed down, the make scan code is sent to the
system. When the key is released, its break code is sent. If two or more keys are held down, only the last key
pressed repeats at the typematic rate. Typematic operation stops when the last pressed key is released, even if
other keys are being released or some other keys are still held down.
The following table shows three scan code sets used in the keyboard.
Scan code set 1
Key
`(~)
1
2
3
4
5
6
7
8
9
0
-(-)
=(+)
BACK SPACE
TAB
Q
W
E
R
T
Y
Make code
29
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
Break code
A9
82
83
84
85
86
87
88
89
8A
8B
8C
8D
8E
8F
90
91
92
93
94
95
Key
X
C
V
B
N
M
,(<)
.(>)
/(?)
SHIFT_R
CTRL_L
ALT_L
SPACE
ALT_R
CTRL_R
NUM
(7)
(4)
(1)
(8)
(5)
Make code
2D
2E
2F
30
31
32
33
34
35
36
1D
38
39
E0 38
E0 1D
45
47
4B
4F
48
4C
Break code
AD
AE
AF
B0
B1
B2
B3
B4
B5
B6
9D
B8
B9
E0 B8
E0 9D
C5
C7
CB
CF
C8
CC
(To be continued)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2001.11.8.
11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet SC83053.PDF ] | |
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