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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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WM8766 Arkusz danych(PDF) 24 Page - Wolfson Microelectronics plc |
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WM8766 Arkusz danych(HTML) 24 Page - Wolfson Microelectronics plc |
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24 / 36 page  WM8766 Production Data w PD Rev 4.1 July 2005 24 DMUTE AND MUTEALL Most simply, the WM8766 can be directly muted using the DMUTE register bit to control which channels are muted. The mute happens as soon as the serial write is performed. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0001001 DAC Mute 5:3 DMUTE [2:0] 000 DAC Soft Mute Select Table 10 DAC Mute Control An overall MUTE to all channels can be applied by using the MUTEALL register. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0000010 DAC Mute 0 MUTEALL 0 Soft Mute Select: 0 : Normal operation 1: Soft mute all channels MUTE PIN AS INPUT The WM8766 can be muted externally by driving the MUTE pin high. When the MUTE pin is driven low the device will never automute, although direct mutes can still be applied via the DMUTE or MUTEALL registers. The DZFM bits are used to decode the operation of a MUTE pin (decides which channels will be affected by the logic level present on the MUTE pin). MPD (Mute Pin Decode) is used to enable the DZFM operation. If MPD is set, the selection made by the DZFM bits will be ignored and all channels will be muted when the pin is driven high. Table 11 below describes which channels will be softmuted when the MUTE pin is driven high depending on the MPD and DZFM bits. MPD DZFM [1:0] CHANNELS MUTED WHEN MUTE PIN HIGH 0 00 All Channels 0 01 CH1 0 10 CH2 0 11 CH3 1 00 All Channels 1 01 All Channels 1 10 All Channels 1 11 All Channels Table 11 Mute Pin Decode when Mute Pin as Input DMUTE [2:0] DAC CHANNEL 1 DAC CHANNEL 2 DAC CHANNEL 3 000 Not MUTE Not MUTE Not MUTE 001 MUTE Not MUTE Not MUTE 010 Not MUTE MUTE Not MUTE 011 MUTE MUTE Not MUTE 100 Not MUTE Not MUTE MUTE 101 MUTE Not MUTE MUTE 110 Not MUTE MUTE MUTE 111 MUTE MUTE MUTE |
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