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LM49352 Datasheet(PDF) 46 Page - Texas Instruments |
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LM49352 Datasheet(HTML) 46 Page - Texas Instruments |
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46 / 106 page  LM49352 SNAS467E – MARCH 2009 – REVISED MARCH 2013 www.ti.com Table 24. HP_SENSE (0x1Bh) (continued) Bits Field Description 3 HPSENSE_AUX_D This bit enables the headphone sense circuit. If enabled, the headphone amplifier will automatically turn on/off based on the logic level of the GPIO pin whenever GPIO is selected as a headphone sense input. If the presence of a headphone insertion is detected, the headphone amplifier will automatically turn on and the Class D loudspeaker amplifier along with the Earpiece / Auxout amplifier will turn off. If a headphone removal is detected the headphone amplifier will automatically turn off and the Class D loudspeaker amplifier along with the Earpiece / Auxout amplifier will turn on. This bit overrides bit 0, bit 1, and bit 2 of this register. HPSENSE_AUX_D Headphone Sense Status 0 Off 1 On ADC Control Registers This register is used to control the LM49352's ADC: Table 25. ADC Basic (0x20h) Bits Field Description 0 MONO This sets mono or stereo operation of the ADC. MONO ADC Operation 0 Stereo Audio 1 Mono Voice (Right ADC channel disabled, Left ADC channel active) 1 OSR This sets the oversampling ratio of the ADC. OSR Stereo Audio ADC Mono Voice ADC Oversampling Ratio Oversampling Ratio 0 128 125 1 128 128 2 MUTE_L If set, a digital mute is applied to the Left (or mono) ADC output. 3 MUTE_R If set, a digital mute is applied to the Right ADC output. 6:4 ADC_CLK_SEL This selects the source of the ADC clock domain, ADC_SOURCE_CLK. ADC_CLK_SEL Source 000 MCLK 001 PORT1_RX_CLK 010 PORT2_RX_CLK 011 PLL_OUTPUT1 100 PLL_OUTPUT2 7 ADC_DSP_ONLY If set, the ADC's analog circuitry is disabled to reduce power consumption, however, ADC DSP functionality is maintained. This can be used to perform asynchronous resampling between audio rates of a common family. Setting this bit is also useful whenever applying Automatic Level Control (ALC) to an analog only audio path. 46 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM49352 |
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