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WM8976 Folha de dados(PDF) 55 Page - Wolfson Microelectronics plc |
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WM8976 Folha de dados(HTML) 55 Page - Wolfson Microelectronics plc |
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55 / 83 page ![]() Preliminary Technical Data WM8976 w PTD Rev 2.0 February 2005 55 A dedicated buffer is available for tying off unused analogue I/O pins as shown in Figure 27. This buffer can be enabled using the BUFIOEN register bit. If the SPKBOOST, OUT3BOOST or OUT4BOOST bits are set then the relevant outputs will be tied to the output of the DC level shift buffer at 1.5xAVDD/2 when disabled. Figure 27 summarises the tie-off options for the speaker and mono output pins. Figure 27 Unused Input/Output Pin Tie-off Buffers L/ROUT2EN/ OUT3/4EN OUT3BOOST/ OUT4BOOST/ SPKBOOST VROI OUTPUT CONFIGURATION 0 0 0 1kΩ tie-off to AVDD/2 0 0 1 30kΩ tie-off to AVDD/2 0 1 0 1kΩ tie-off to 1.5xAVDD/2 0 1 1 30kΩ tie-off to 1.5xAVDD/2 1 0 X Output enabled (DC level=AVDD/2) 1 1 X Output enabled (DC level=1.5xAVDD/2) Table 46 Unused Output Pin Tie-off Options |
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