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TDA9209 데이터시트(PDF) 10 Page - STMicroelectronics

부품명 TDA9209
상세설명  150 MHz PIXEL VIDEO CONTROLLER FOR MONITORS INCLUDING CUT-OFF INPUTS AND VIDEO DETECTION
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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TDA9209
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4.14 Power-on Reset
A power-on reset function is implemented on the
TDA9209 so that the I
2C registers have a deter-
mined status after power-on. The Power-on reset
threshold for a rising supply on VCCA (Pin 7) is
3.8 V (typ.) and 3.2V when the VCC decreases.
Figure 9. I2C Write Operation
4.15 Video detection (see Figure 10)
The video detection consists of three fast compa-
rators and a OR function.
The positive input of each comparator is connect-
ed to the input video pin (R, G, or B).
The negative inputs are connected together to a
reference voltage. This voltage is the threshold of
the comparators. The typical threshold voltage is
120 mV. The three comparator outputs are con-
nected to the OR inputs. Active Video output can
be inhibited by using bit 7 in Register 13 :
When AV output is validated, the AV output reach-
es 5V when at least one of the 3 video inputs gets
higher than 3.8V (typ.), and decreases to 0V if the
3 input voltages get lower than 3.2V (typ.).
Figure 10. Video Detection
SCL
W
A7
A6
A5
A4
A3
A2
A1
A0
SDA
Register Address
ACK
ACK
I2C Slave Address
Start
D7
D6
D5
D4
D3
D2
D1
D0
Data Byte
ACK
Stop
R13b7 = 0
AV inhibited
R13b7 = 1
AV validated
120mV
R13b7=0
AV
IN1
IN2
IN3
8
1
3
5


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