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TDA9209 데이터시트(PDF) 10 Page - STMicroelectronics |
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10 / 22 page TDA9209 10/22 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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