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PDF LG83053S Data sheet ( Hoja de datos )
| Número de pieza | LG83053S | |
| Descripción | Keyboard Encoder | |
| Fabricantes | LIZE | |
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Shenzhen LIZE Electronic Technology Co., Ltd
SPECIFICATION
LG83053S
Keyboard Encoder
Version 1.1
reserves the right to change this documentation without prior
1 page  
Tel:86-755-8835 3502/03/04
Website:http://www.lizhiic.com
6. BLOCK DIAGRAM
VDD
Fax:86-755-8835 3509
LG83053S
PS/2 Keyboard
OSCI
OSC
Clock
Generato
Timing
Generato
Power
On Reset
Keyboard
Scan &
I/O control
Command
Processor
& Encoder
PS2 interface
PA0~PA
PB0~PB
PC0~PC
PD0~PD7
PE0~PE5
CLK
DATA
GND
7. FUNCTION DESCRIPTIONS
The LG83053S ‘s main function is to detect key press and release activity and to transmit the
corresponding scan code, as well as make and break codes to the system. The device also
accepts commands from the system. The communication between the keyboard and the system is
realized via a serial port consists of CLOCK and DATA pins.
7.1 Power-On-Reset And Self-Test
The power-on-reset (POR) occurs first when power is applied to the keyboard. The duration of
POR is 150ms ~ 2s. After POR, the self-test BAT (Basic Assurance Test) happens, it takes 300ms
~ 500ms.
The following activities take place in BAT:
1) Turns on LED indicators at the beginning.
2) Test.
3) Turns off LED indicators at the end.
4) Send the result to the system.
A completion code AA is sent to the system if BAT is successful. An error code is sent if BAT fails.
BAT takes 300ms~500ms. The completion codes are sent 450ms~2.5s after POR, and
Shenzhen LIZE Electronic Technology Co., Ltd
Version: 1.1
Date: 16. Jan. 2008
Page: 5 of 26
5 Page 
Tel:86-755-8835 3502/03/04
Website:http://www.lizhiic.com
7.4.3 Data Communication via Serial Port
Fax:86-755-8835 3509
LG83053S
PS/2 Keyboard
Data output
The keyboard first checks the CLK and DATA lines. If both of them are high, that means data
transmission from keyboard to the system is permitted, then keyboard starts to clock data out. Data will
be valid before the trailing edge and after the leading edge. The keyboard checks the clock line at least
every 60us. If the clock line is lowered before the leading edge of the 10th clock, the keyboard should
stop sending, and set both data line and clock line to high.
Data input
The system checks the CLK line first. If the keyboard is not sending data or it is sending data but
has not reached the 10th clock, the system can force the clock line low for more than 60us and prepares
to send data.
The keyboard checks clock line status at intervals of no more than 5ms. If a
system-request-to-send (RTS) is detected, the keyboard clocks 11 bits in. After the 10th bit, the
keyboard checks the data line. If the data line is high, the keyboard 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, a frame error occurs. When a frame error occurs, the keyboard
should continue to count until data line goes high, then pulls it low and sends a RESEND command to
the system.
7.5 Keyboard Scan Code Table
The keyboard supports 3 scan code sets. When a key is pressed down, its 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.
Scan code set 1
Key Make Code Break Code Key Make Code Break Code
`(~) 29 A9 X 2D AD
1 02 82 C 2E AE
2 03 83 V 2F AF
3 04 84 B 30 B0
4 05 85 N 31 B1
Shenzhen LIZE Electronic Technology Co., Ltd
Version: 1.1
Date: 16. Jan. 2008
Page: 11 of 26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LG83053S.PDF ] | |
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