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STA321MPL1 数据表(PDF) 37 Page - STMicroelectronics |
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STA321MPL1 数据表(HTML) 37 Page - STMicroelectronics |
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37 / 80 page  DocID029389 Rev 1 37/80 STA321MPL1 Registers 80 The volume structure of the STA321MPL1 consists of individual volume registers for each channel and a master volume register that provides an offset to each channel’s volume setting. There is also an additional offset for each channel called channel volume trim. The individual channel volumes are adjustable in 0.5 dB steps from 48 dB to -78 dB. As an example, if C5V = 0xXX or +XXX dB and MV = 0xXX or -XX dB, then the total gain for channel 5 = XX dB. The channel volume trim is adjustable independently on each channel from -10 dB to 10 dB in 1 dB steps. A fine volume configuration register could be used to offset each channel at 0.25 dB step. The master mute when set to 1 mutes all channels at once, whereas the individual channel mutes (CnM) mutes only that channel. Both the master mute and the channel mutes provide a "soft mute" with the volume ramping down to mute in 8192 samples from the maximum volume setting at the internal processing rate (~192 kHz). A "hard mute" can be obtained by commanding a value of 0xFF (255) to any channel volume register or the master volume register. When volume offsets are provided via the master volume register any channel whose total volume is less than -91 dB is muted. All changes in volume take place at zero- crossings when ZCE = 1 (configuration register H) on a per-channel basis as this creates the smoothest possible volume transitions. When ZCE = 0, volume updates occur immediately. Each channel also contains an individual channel volume bypass. If a particular channel has volume bypassed via the CnVBP = 1 register, then only the channel volume setting for that particular channel affects the volume setting, the master volume setting does not affect that channel. Each channel also contains a channel mute. If CnM = 1, a soft mute is performed on that channel. MV[7:0] Volume offset from channel value 0x00 0 dB 0x01 -0.5 dB 0x02 -1 dB …… 0x4C -38 dB …… 0xFE -127 dB 0xFF Hardware channel mute CnV[7:0] Volume 0x00 48 dB 0x01 47.5 dB 0x02 47 dB …… 0x5F 0.5 dB 0x60 0 dB 0x61 -0.5 dB …… 0xFE -79.5 dB 0xFF Hardware channel mute |
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