LC7458B-04 查看數據表（PDF） - SANYO -> Panasonic
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LC7458B-04 Datasheet PDF : 11 Pages
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LC7458B-04
Parallel Input Mode Transitions
Input
DEC ON/OFF
CAPTION/TEXT
FIELD1/FIELD2
CHANNEL1/CHANNEL2
1. ×=don’t care
TV mode
(captin OFF)1
High
×
×
×
Mode
Caption
CH1
Low
Caption
CH2
Low
Text
CH1
Low
Text
CH2
Low
High
High
Low
Low
FIELD1=High and FIELD2=Low for each mode
High
Low
High
Low
Decoding commences when DEC ON/OFF is ON. While DISP ON/OFF is not ON, the caption is not displayed on the
screen. Also if DISP ON/OFF goes from ON to OFF while decoding, then decoding continues and the screen display is
removed.
TV mode is restored after a reset.
Pulse Width Signal (PWM) Control
PWM Timing
2≤n≤10
T1 : Command time (490 to 510µs)
T2 : Command decision time (300 to 500µs)
T3 : Input prohibit time (33ms)
PWM Command Summary
2T : Display stop
3T : Display re-start
4T : Caption channel 1
5T : Text channel 1
6T : Caption channel 2
7T : Text channel 2
8T : TV mode
9T : Field 1
10T : Field 2
LED Display Functions
The LC7458B-04 has 5 built-in LED driver circuits which
are used to indicate the different modes of operation.
LED OUT1 (pin 1)
Caption mode when ON. Text mode or decoder when OFF.
LED OUT2 (pin 2)
Text mode when ON. Caption mode or decoder when OFF.
LED OUT3 (pin 3)
Channel 1 selected when ON. Channel 2 selected or de-
coder when OFF.
LED OUT4 (pin 4)
Channel 2 selected when ON. Channel 1 selected or de-
coder when OFF.
LED OUT5 (pin 5)
Field 2 selected when ON. Field 1 selected or decoder when
OFF.
Automatic Display ON/OFF
The LC7458B-04 uses the presence of valid data on line
21H to automatically switch display ON/OFF to prevent
the inadvertent display of erroneous captions. If 45 con-
tinuous instances of invalid data (parity error) are detected,
the display is automatically removed. Then if 15 continu-
ous instances of valid data is received, the display is re-
started.
No.4978–8/11
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