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TDA8366 Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA8366 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 48 page  January 1995 11 Philips Semiconductors Objective specification I2C-bus controlled PAL/NTSC TV processor TDA8366 RGB output circuit and black-current stabilization The colour-difference signals are matrixed with the luminance signal to obtain the RGB-signals. For the RGB-inputs linear amplifiers have been chosen so that the circuit is suited for signals coming from the SCART connector. The contrast and brightness control operate on internal and external signals. The output signal has an amplitude of approximately 2 V black-to-white at nominal input signals and nominal settings of the controls. The black current stabilization is realized by means of a feedback from the video output amplifiers to the RGB control circuit. The ‘black current’ of the 3 guns of the picture tube is internally measured and stabilized. The black level control is active during 4 lines at the end of the vertical blanking. During the first line the leakage current is measured and the following 3 lines the 3 guns are adjusted to the required level. The maximum acceptable leakage current is ±100 µA. The nominal value of the ‘black current’ is 10 µA. The ratio of the currents for the various guns automatically tracks with the white point adjustment so that the back-ground colour is the same as the adjusted white point. The input impedance of the ‘black-current’ measuring pin is 15 k Ω. Therefore the beam current during scan will cause the input voltage to exceed the supply voltage. The internal protection will start conducting so that the excessive current is bypassed. When the TV receiver is switched-on the black current stabilization circuit is not active, the RGB outputs are blanked and beam current limiting input pin is short-circuited. Only during the measuring lines will the outputs supply a voltage of 5 V to the video output stage so that it can be detected if the picture tube is warming up. These pulses are switched-on after a waiting time of approximately 0.5 s. This ensures that the vertical deflection is activated so that the measuring pulses are not visible on the screen. As soon as the current supplied to the measuring input exceeds a value of 190 µA the stabilization circuit is activated. After a waiting time of approximately 0.8 s the blanking and the beam current limiting input pin are released. The remaining switch-on behaviour of the picture is determined by the external time constant of the beam current limiting network. I2C-BUS SPECIFICATION Valid subaddresses: 00 to 13; subaddress FE is reserved for test purposes. Auto-increment mode is available for subaddresses. Start-up procedure Read the status bytes until POR = 0 and send all subaddress bytes. The horizontal output signal is switched-on when the oscillator is calibrated. It is possible to have the horizontal output signal available before calibration. Then the SFM bit must be set to logic 0. Each time before the data in the IC is refreshed, the status bytes must be read. If POR = 1, the procedure mentioned above must be carried out to restart the IC. When this procedure is not followed the horizontal frequency may be incorrect after power-up or after a power dip. handbook, halfpage MLA743 A6 A5 A4 A3 A2 A1 A0 1 0 0 0 101 1/0 R/W Fig.4 Slave address (8A). X = don’t care. |
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