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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STA321 Scheda tecnica(PDF) 72 Page - STMicroelectronics |
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STA321 Scheda tecnica(HTML) 72 Page - STMicroelectronics |
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72 / 157 page  Headphone detection STA321 72/157 Doc ID 15351 Rev 3 12 Headphone detection The headphone detector circuit, shown in Figure 51, is made with two schmitt-trigger comparators (with different thresholds) which sense the value of the HPDECT input voltage and modifies the HP_DET1 or the HP_DET2 level as given in Table 30 and Table 31 below. The comparators are enabled or disabled with bits E_HP1 and E_HP2 in register HPDET2 on page 138 The comparator output status is provided via bits 1 and 0 of register HPDET2 on page 138. One of the comparator outputs is then selected with register bit HPDET1.HPD_SEL, and that signal is passed through a digital debouncing filter and supplied to the FFX modulator. The PWM outputs are then modified depending on the settings of register bits HPDST.HP_DET_FILT and HPDET1.HPD_ACT_MODE. Table 30. Headphone 1 detector E_HP1 (register HPDET2) HP-jack status HP_DET voltage HP_DET1 Status register bit HPDST.HP_DET_FILT 1 Unplugged Low 0 - 1 Plugged High 1 - 0X X 1 - Table 31. Headphone 2 detector E_HP2 (register HPDET2) HP-jack status HP_DET voltage HP_DET2 Status register bit HPDST.HP_DET_FILT 1 Unplugged Low 1 - 1 Plugged High 0 - 0X X 1 - |
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