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CXA2513M Fiches technique(PDF) 16 Page - Sony Corporation |
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CXA2513M Fiches technique(HTML) 16 Page - Sony Corporation |
16 / 20 page – 16 – CXA2513M 3. Mute Pulse Generation The CXA2513M has one voltage comparator built-in. The built-in voltage comparator is used to produce mute pulse during the depress of the preset mode switches. During depress the switch, there is a voltage pulse of about 1V depending appearing at the cathode of the LEDs. The mute detector comparator is used to detect this voltage changes at the cathode of LEDs and produce mute pulse at Pin 12. The polarity of the mute pulse can be set. When the M_DET+ pin (Pin 18) is higher than the M_DET– pin (Pin 17), the MUTE pin (Pin 12) will be high. When the M_DET+ pin (Pin 18) is lower than the M_DET– pin (Pin 17), the MUTE pin (Pin 12) becomes low. A capacitor is used to store the initial voltage before the depression of the mode switch. Once the switch is depressed, the capacitor starts discharge. The values of the resistors and capacitor set the duration of the mute pulse. Notes on Operation 1) Value of Timing Capacitor The timing and the duration of the MUTE pin and the LEDs light-up depends on the value of the timing capacitor as the timing capacitor is discharging to (VCC – 5∗VBE). The charging time constant is 250K ∗(timing capacitor) and the discharging time constant is 150K∗(timing capacitor). The two threshold values: a) Latch Output Enable (LATCH_OE_ctl) b) Latch enable/Mute disable (LATCH_ctl) The threshold values of the Latch Output Enable (LATCH_OE_ctl) is set to (VCC – 3∗VBE) and the threshold values of the Latch enable/Mute disable (LATCH_ctl) is set to (VCC – 4∗VBE). So, the duration for all the LEDs light-up is 2∗VBE = (5VBE) exp (–t1/RC) where R = 150K and the sound appears after t2 seconds if the mute pulse output pin is used. This t2 is given by VBE = (5VBE) exp (–t2/RC) where R = 150K Therefore, depending on the requirements of the time on the mute sound and the duration of all LEDs light-up, choose the value of the timing capacitors. |
Numéro de pièce similaire - CXA2513M |
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Description similaire - CXA2513M |
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