5.2. VGA Output Module (Local Preview Image Output Module)
VGA main chip module
：
LVC07A, 6303; LVC07A PIN 2 output single(VS)
and 1 K resistance (RL50) connect 5V voltage, PIN 4 output signal (HS) and
1 K (RL51) resistance connect 5V voltage
BAV99: control VGA output amplification, if BAV99 (Q9) 3 feet low level
(voltage 0 V), it means the system to detect VGA display; If you meet VGA
display, system and output signal and system menu VGA; If behind the VGA
display, the system only output VGA signal; If the high level (close to 3.3 V),
it means the system does not detect the display
VGA signal output basic schemes:
①
: PIN 10 output “R” signal ;
②
: PIN 11 output “B” signal ;
③
: PIN 12 output “G” signal ;
④
: PIN 4 output “HS” signal ;
⑤
: PIN 2 output “VS” signal ;
VGA master chip : 74LV07 and 6303
Description:
6303
74LV07
75
Ω
(RG6)
75
Ω(RG
5)
75
Ω(RG
4)
BAV99(Q3)
BAV99(Q8)
BAV99(Q7)
②
①
③
④
⑤
