DL7942 Datasheet PDF - QiXin

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DL7942
QiXin

Part Number DL7942
Description single chip keyboard encoder
Page 22 Pages


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DL7942
键盘 IC
GENERAL DESCRIPTION
The DL7942 a single chip keyboard encoder developed for IBM PC AT, IBM PS2 and compatible machine keyboard.
The device detects the key press and release activity, sends the scan code to system, and accepts the command from system.
A high performance, low cost keyboard can be achieved by using the DL7942 with the minimal external components.
FEATURES
Support scan code set 1, 2 and 3.
Support PC AT and PS/2 keyboard.
104/107 keys with with multi media or other special application keyboard encoder.
Support WINDOWS95, 98, 2000 keys.
IBM PC AT or compatible machine keyboard
IBM PS/2 model 30, 50, 60, 80 or compatible machine keyboard.
Phantom key detects.
Built-in RC oscillator with external resistor.
Internal pull-up resistor for inputs.
Tri-state outputs.
Low power CMOS device technology.
APPLICATION
PIN DESCRIPTION
PIN NO
Pin Name
1 GND
2 OSCO
3 DATA
4 CLK
245611~1522232119
19181716202526
C0~C17
27~34
R0~R7
78910
NC
35 SCRL
36 NUM
37 CAPS
38 NC
39 VDD
40 OSCI
Direction
POWER
O
I/O
I/O
Function description
Negative power supply pin
Clock output
Data line of serial port
Clock line of serial port,
O Keyboard matrix scanning output pins
I
-
O
O
O
TEST
POWER
I
Keyboard matrix scanning input pins
No connection
Scroll Lock indicator
Num Lock indicator
CAPS lock indicator
--
Positive power supply pin
External oscillator resistor connection pin
FUNCTION DESCRIPTIONS
The DL7942‘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.
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