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SAA7824 Datasheet(PDF) 35 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 35 Page - NXP Semiconductors |
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35 / 89 page  2003 Oct 01 35 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 7.16.9.4 Automatic sequencers and timer interrupts Two automatic sequencers are implemented (and must be initialized after Power-on): • Auto-start sequencer: controls the start-up of focus, radial and motor • Auto-stop sequencer: brakes the disc and shuts down the servos. When the automatic sequencers are not used it is possible to generate timer interrupts, defined by the time_parameter coefficient. 7.16.9.5 High-level status The read high-level status command can be used to obtain the interrupt, decoder, autosequencer status registers and the motor start time. Use of the read high-level status command clears the interrupt status register, and re-enables the subcode read via a servo command. 7.16.10 DRIVER INTERFACE The control signals (pins RA, FO and SL) for the mechanism actuators are pulse density modulated. The modulating frequency can be set to either 1.0584 or 2.1168 MHz; controlled via the xtra_preset parameter. An analog representation of the output signals can be achieved by connecting a 1st-order low-pass filter to the outputs. During reset (i.e. RESET pin is held LOW) the RA, FO and SL pins are high-impedance. At all other times, when the laser is switched off, the RA and FO pins output a 2 MHz 50% duty factor signal. 7.16.11 LASER INTERFACE The laser diode pre-amplifier function is built into the SAA7824 and is illustrated in Fig.24. The current can be regulated, up to 120 mA in four steps ranging from 58% up to full power. New shadow register A (bank 2) and new shadow register 3 (bank 3) are used to select the step values. The voltage derived from the monitor diode is maintained at a steady state by the laser drive circuitry, regulating the current through the laser diode. The type of monitor diode being used (150 mV or 180 mV) must be selected by new shadow register 7 (bank 2) (reset state = 150 mV). The laser can be switched on or off by the xtra_preset parameter; it is automatically driven if the focus control loop is active. |
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