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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7492 датащи(PDF) 23 Page - STMicroelectronics |
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TDA7492 датащи(HTML) 23 Page - STMicroelectronics |
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23 / 32 page  TDA7492 Applications information Doc ID 14926 Rev 5 23/32 6 Applications information 6.1 Mode selection The three operating modes of the TDA7492 are set by the two inputs, STBY (pin 20) and MUTE (pin 21). ● Standby mode: all circuits are turned off, very low current consumption. ● Mute mode: inputs are connected to ground and the positive and negative PWM outputs are at 50% duty cycle. ● Play mode: the amplifiers are active. The protection functions of the TDA7492 are enabled by pulling down the voltages of the STBY and MUTE inputs shown in Figure 29. The input current of the corresponding pins must be limited to 200 µA. Figure 29. Standby and mute circuits Figure 30. Turn on/off sequence for minimizing speaker “pop” Table 6. Mode settings Mode STBY MUTE Standby L (1) 1. Drive levels defined in Table 5: Electrical specifications on page 9 X (don’t care) Mute H (1) L Play H H TDA7492 STBY MUTE 0 V 3.3 V C7 2.2 µF R2 30 k Ω Standby 0 V 3.3 V C15 2.2 µF R4 30 k Ω Mute |
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