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MSC1208 Datasheet(PDF) 4 Page - OKI electronic componets

Part No. MSC1208
Description  23-bit x 2 Duplex Controller/Driver with Digital Dimming and Keyscan Function
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Maker  OKI [OKI electronic componets]
Homepage  http://www.oki.com
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MSC1208 Datasheet(HTML) 4 Page - OKI electronic componets

 
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MSC1208
¡ Semiconductor
PIN DESCRIPTIONS
Pin
Symbol
Type
42
VDD
Power Sypply Voltage. A 12V power supply is connected.
Description
20
GND
19
Ground. 0V is applied.
Serial data input-output.
Enters the input mode when a "H" level signal is input to DATA ENABLE; enters the
output mode when a "L" level signal is input to DATA ENABLE.
DATA
DATA
ENABLE
I/O
18
I
Serial clock input.
During the "H" level of clock pulse, the input data of the DATA I/O pin (display data or
dimming data) is read, and during the "L" level of clock pulse, the output data (key
swich data) is output to the DATA I/O pin.
Input for the key matrix.
These pins are "L" active. When these keys are in the inactive state, these pins are at
"H" level through the internal pull-up resistors. COL1 to COL3 are for the rotary switch
and COL4 to COL7 are for the push-button switch.
11 to 17
COL1 to 7
I
7 to 10
ROW1 to 4
O
Signal outputs for scanning key matrix.
Normally, ROW1 to ROW4 output a "I" level. Key scanning is executed only once when
a transfer of the rotary switch contact or pressing down or release of the push-button
switch is detected. Key scanning is continued if the rotary switch contact is in the open
state after this one-time scanning. Then, scanning stops when the rotary switch contact
makes connection with any of the selective contacts. After key scanning is stopped,
ROW1 to ROW4 return to a "L" level.
21
OSC
I/O
RC oscillator connection. A capacitor is connected between GND and this pin.
25 to 41,
1 to 6
SEG1 to 23
O
Segment signal output.
Inverted GRID signal output. This signal is connected to an external grid driver
(e.g., PNP transistor) input.
Input for test. Since this pin has as internal a pull-up resistor, leave this pin open or
pull it up for use. When a "L" level signal is input, all segment outputs go on and off
at intervals of 1 second.
23 , 24
GRID1,2
O
22
TEST
I


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