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STA381BWS データシート(PDF) 149 Page - STMicroelectronics |
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STA381BWS データシート(HTML) 149 Page - STMicroelectronics |
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149 / 174 page  DocID018937 Rev 7 149/174 STA381BWS Register description: Sound Terminal compatibility 7.18 Extra volume resolution configuration registers (address 0x3F; 0x40) Extra volume resolution allows fine volume tuning by steps of 0.125 dB. The feature is enabled when VRESEN=1, as depicted in Figure 43. The overall channel volume in this case will be CxVol+CxVR (in dB), while the master volume will be MVOL+MVR (in dB). Figure 43. Extra resolution volume scheme If VRESEN = 0 the channel volume will be defined only by the CxVol registers. Fine tuning steps can be set according to the following table for channels 1, 2,3, and master volume. Table 162. Volume fine-tuning steps D7 D6 D5 D4 D3 D2 D1 D0 VRESEN VRESTG C3VR[1] C3VR[0] C2VR[1] C2VR[0] C1VR[1] C1VR[0] 10000000 D7 D6 D5 D4 D3 D2 D1 D0 reserved reserved reserved reserved reserved reserved MVR[1] MVR[0] 00000000 CxVR/MVR Mode 00 0 dB 01 -0.125 dB 10 -0.25 dB 11 -0.375 dB Audio Data Out CxVOL Soft Volume X X Audio Data In VRESEN VRESTG CxVR MVOL or CxVOL’event 1 0 0 1 Audio Data Out CxVOL Soft Volume X X Audio Data In VRESEN VRESTG CxVR MVOL or CxVOL’event 1 0 0 1 Obsolete Product(s) - Obsolete Product(s) |
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