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参数资料
| 型号： | LC7458B-04 |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP52 |
| 封装： | DIP-52 |
| 文件页数： | 10/11页 |
| 文件大小： | 265K |
| 代理商： | LC7458B-04 |
LC7458B-04
No.4978–8/11
Parallel Input Mode Transitions
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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 510
s)
T2 : Command decision time (300 to 500
s)
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.
LC7458B-04
No.4978–9/11
Alarm Function
If the caption data on line 21H is the alarm ON code, then ALARM OUT (pin 6) goes high. This condition is maintained
until either an alarm OFF code is received or a decoder reset occurs.
OSD Display Start Positioning Function
After a reset, the levels on DISP ADJ0 to DISP ADJ5 (pins 36 to 38 and 42 to 44) at the next horizontal sync signal HS
rising edge determine the horizontal display start position out of a possible 64 positions.
The display start posision is given by
Start Position=[DISP ADJ5 to 0]
×2×TLC
where TLC is the LC oscillator period.
Extended Characters
Of the 64 EIA-608 Optional Extended Characters, the following 16 are supported.
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