TDA9209 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA9209 Datasheet PDF : 22 Pages
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TDA9209
4.14 Power-on Reset
A power-on reset function is implemented on the
TDA9209 so that the I2C registers have a deter-
mined status after power-on. The Power-on reset
Figure 9. I2C Write Operation
threshold for a rising supply on VCCA (Pin 7) is
3.8 V (typ.) and 3.2V when the VCC decreases.
SCL
SDA
Start
I2C Slave Address
W
A7 A6 A5 A4 A3 A2 A1 A0
D7 D6 D5 D4 D3 D2 D1 D0
ACK
Register Address
ACK
Data Byte
ACK Stop
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-
Figure 10. Video Detection
nected to the OR inputs. Active Video output can
be inhibited by using bit 7 in Register 13 :
R13b7 = 0
R13b7 = 1
AV inhibited
AV validated
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.).
IN1 1
IN2 3
IN3 5
8 AV
120mV
R13b7=0
10/22
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