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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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LM49352 Scheda tecnica(PDF) 45 Page - Texas Instruments |
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LM49352 Scheda tecnica(HTML) 45 Page - Texas Instruments |
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45 / 106 page  HPR HPL RPU 500 k: RPD 50 k: I/OVDD GPIO RPD 50 k: Headphone Jack with a Normally Closed (NC) Mechanical Switch LM49352 LM49352 www.ti.com SNAS467E – MARCH 2009 – REVISED MARCH 2013 to RPU. The GPIO pin detects a logic low level due to the voltage division between RPU and RPD. When the GPIO pin is set to HPSENSE mode, a logic low voltage reading causes the HDC to disable the headphone amplifier. When a headphone plug is inserted, the mechanical connection between RPU and RPD is broken, resulting in a logic high level detected by the GPIO pin. A logic high voltage reading causes the HDC to enable the headphone amplifier. The HDC has four modes of operation that automatically enable/disable different combinations of the audio output amplifiers contained within the LM49352. Having the choice of four different HDC settings maximizes power management flexibility to suit a particular application. Please refer to the HP_SENSE (reg 0x1Bh) register table for a detailed discussion on the different HDC modes of operation. Figure 60. Application Circuit for Headphone Detection Table 24. HP_SENSE (0x1Bh) Bits Field Description 0 HP SENSE 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. If a headphone removal is detected the headphone amplifier will automatically turn off. HPSENSE Headphone Sense Status 0 Off 1 On 1 HPSENSE_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 will turn off. If a headphone removal is detected the headphone amplifier will automatically turn off and the Class D loudspeaker amplifier will turn on. This bit overrides bit 0 of this register. HPSENSE_D Headphone Sense Status 0 Off 1 On 2 HPSENSE_AUX 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 Earpiece / Auxout amplifier will turn off. If a headphone removal is detected the headphone amplifier will automatically turn off and the Earpiece / Auxout amplifier will turn on. This bit overrides bit 0 and bit 1 of this register. HPSENSE_AUX Headphone Sense Status 0 Off 1 On Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 45 Product Folder Links: LM49352 |
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