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TDF8599TD Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDF8599TD Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 52 page  TDF8599_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 13 November 2008 7 of 52 NXP Semiconductors TDF8599 Class-D power amplifier with load diagnostics The TDF8599 includes integrated common circuits for all channels such as the oscillator, all reference sources, mode functionality and a digital timing manager. In addition, the built-in protection includes thermal foldback, temperature, overcurrent and overvoltage (load dump). The TDF8599 operates in either I2C-bus mode or non-I2C-bus mode. In I2C-bus mode, DC load detection, frequency hopping and extended configurability are provided together with enhanced diagnostic information. 8.2 Mode selection The mode pins EN and SEL_MUTE enable mute state, I2C-bus mode and Operating mode switching. Pin SEL_MUTE is used to mute and demute the device and must be connected to an external capacitor. This capacitor generates a time constant which is used to ensure smooth fade-in and fade-out of the input signal. When pin EN is LOW, the TDF8599 is off and the supply current is at its lowest value (typically 2 µA). When off, the TDF8599 is completely deactivated and will not react to I2C-bus commands. The TDF8599 is enabled when pin EN is HIGH. A resistor connected between pin ADS and ground determines if the TDF8599 is in I2C-bus mode or in non-I2C-bus mode (see Section 9). I2C-bus mode is selected by leaving the connection between pin ADS and pin GND open. In I2C-bus mode with pin EN HIGH, the TDF8599 is in Standby mode and will wait for further commands. Non-I2C-bus mode is selected by connecting pin ADS to pin GND. In non-I2C-bus mode, the default TDF8599 state is Mute mode. The amplifiers switch idle (50 % duty cycle) and the audio signal is suppressed at the output. In addition, the capacitor (CSVRR) is charged to half the supply voltage. To enter Operating mode, pin SEL_MUTE must be released (see Figure 4) and capacitor (CON) charged by an internal pull-up. I2C-bus mode and non-I2C-bus mode control are described in Table 4 and Table 5. Switches S1 and S2 are illustrated in Figure 4. a. non-I2C-bus mode b. I2C-bus mode Fig 4. Mode selection 001aai769 SEL_MUTE EN 3.3 V CON S1 S2 TDF8599 001aai770 SEL_MUTE EN 3.3 V CON S2 TDF8599 |
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