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PDF ( 数据手册 , 数据表 ) DL7942

零件编号 DL7942
描述 single chip keyboard encoder
制造商 QiXin
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DL7942 数据手册, 描述, 功能
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.
1 页 共 22







DL7942 pdf, 数据表
DL7942
键盘 IC
KEY
INS
Base Case, or shift+Nun
Lock Make/Break
E0 52/E0 D2
DEL
E0 53/E0 D3
LEFT
E0 4B/E0 CB
HOME
E0 47/E0 C7
END
E0 4F/E0 CF
UP E0 48/E0 C8
DOWN
E0 50/E0 D0
PAGE UP
E0 49/E0 C9
PAGE DOWN
E0 51/E0 D1
RIGHT
E0 4D/E0 CD
Shift Case* Make/Break
E0 AA E0 52/
E0 D2 E0 2A
E0 AA E0 53/
E0 D3 E0 2A
E0 AA E0 4B/
E0 CB E0 2A
E0 AA E0 47/
E0 C7 E0 2A
E0 AA E0 4F/
E0 CF E0 2A
E0 AA E0 48/
E0 C8 E0 2A
E0 AA E0 50/
E0 D0 E0 2A
E0 AA E0 49/
E0 C9 E0 2A
E0 AA E0 51/
E0 D1 E0 2A
E0 AA E0 4D/
E0 CD E0 2A
Nun Lock Make/Break
E0 2A E0 52/
E0 D2 E0 AA
E0 2A E0 53/
E0 D3 E0 AA
E0 2A E0 4B/
E0 CB E0 AA
E0 2A E0 47/
E0 C7 E0 AA
E0 2A E0 4F/
E0 CF E0 AA
E0 2A E0 48/
E0 C8 E0 AA
E0 2A E0 50/
E0 D0 E0 AA
E0 2A E0 49/
E0 C9 E0 AA
E0 2A E0 51/
E0 D1 E0 AA
E0 2A E0 4D/
E0 CD E0 AA
Key Scan Code Make/Break
(/) E0 35/E0 B5
Shift Case Make/Break*
E0 AA E0 35/E0 B5 E0 2A
Key
PRINT
Scan Code
Make/Break
E0 2A E0 37
/E0 B7 E0 AA
Ctrl Case, Shift Case
Make/Break
E0 37/E0 B7
A lt Case
Make/Break
54/D4
Key
Make Code
Ctrl Key Pressed
Pause (not Typematic)
EI ID 45 EI 9D C5
E0 46 E0 C6
Note *:If the left Shift key is held down, the AA/2A Shift make and break is sent with the other scan codes. If the right
Shift key is help down, B6/36 is sent. If both Shift keys are down, both sets of codes are sent with the other scan
code.
8 页 共 22







DL7942 equivalent, schematic
DL7942
K147
Calculator
键盘 IC
E021
E0A1
E02B
E0F02B
TURBO FUNCTION
Fn+ F1
F2
F3
F4
F5
2.1hz
4.2hz
7.2hz
16.3hz
21hz
INTERNAL-MULTIKEY FUNCTION:
Multi-Meida Function
Fn+ Pad_2 Volume-
(M/Mode) Pad_3 Play/pause
Pad_4 Pre track
Pad_5 Media
Pad_6 Next Track
Pad_7 Mute
Pad_8 Volume+
Pad_9 Stop
Internal Function
Pad_Enter Web/home
Pad_+
Mail
Pad_+
Favorites
Pad_
Search
Right arrow Forward
Left arrow Back
Down arrow Stop
Up arrow
Refresh
F6 30hz
F7 46hz
F11 Key lock
Pad_0
Pad_1
O.S Function
My computer
Calculator
E Eurkey
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply voltage
Input voltage
Output voltage
Operating temperature
Storage temperature
sym
VDD
VIN
VOUT
TOP
TS
Ratings
-0.5~+6v
-0.3~+6v
-0.3~+6v
0~70
-50~150
DC ELECTRICAL CHARACTERISTICS(VDD=5V,Temperature=27)
Parameter
Operating voltage
Operating supply current
Input leakage
Input high voltage
Input low voltage
Output low voltage
Output low voltage for LEDS
Output low voltage for DATA CLK
Sym. Min.
VDD 4.5
IDD -
IINH -
VIH 2.0
VIL -
VOL1
-
VOL2
-
VOL3
-
16 页 共 22
Typ.
5
-
-
-
-
-
-
-
Max.
5.5
4
±2
-
0.8
0.4
3.2
0.4
Unit
V
mA
uA
V
V
V
V
V
Condition
Fosc=1.8MHz
VIN=VCC
I0I1=3mA
I0I2=10mA
I0I3=5mA










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