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WM8944BECS/R 数据表(PDF) 58 Page - Cirrus Logic |
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WM8944BECS/R 数据表(HTML) 58 Page - Cirrus Logic |
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58 / 165 page  WM8944B 58 Rev 4.3 SPEAKER OUTPUT CONTROL Each Speaker output has its own output mixer. This allows the output of the Speaker PGA to be enabled or disabled, and also allows the AUX and IN1 inputs to be routed directly to the Speaker outputs. (AUX can be routed to SPKOUTP; IN1 can be routed to SPKOUTN, as illustrated in Figure 18. The two Speaker outputs can be muted also, using SPKN_OP_MUTE and SPKP_OP_MUTE. As described above, the analogue inputs AUX and IN1 can be routed directly to the Speaker outputs, bypassing the Speaker PGA and mixers. This can be used to provide a fixed-gain signal path that is unaffected by the Speaker PGA setting. This feature is intended for a “PC Beep” or similar applications. Care should be taken when enabling more than one path to the Speaker Output mixers in order to avoid clipping. The gain of each input path is adjustable using a selectable -6dB control in each path to facilitate this. The Speaker Output control registers are described in Table 36. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R3 (03h) Power Management 1 9 SPKN_OP_MUTE 1 SPKOUTN Output Mute 0 = Disable Mute 1 = Enable Mute 8 SPKP_OP_MUTE 1 SPKOUTP Output Mute 0 = Disable Mute 1 = Enable Mute R43 (2Bh) SPK mixer control 1 8 AUX_TO_SPKP 0 AUX to SPKOUTP select 0 = Disabled 1 = Enabled 7 PGA_TO_SPKP 0 Speaker PGA Mixer to SPKOUTP select 0 = Disabled 1 = Enabled R44 (2Ch) SPK mixer control2 9 IN1_TO_SPKN 0 IN1 to SPKOUTN select 0 = Disabled 1 = Enabled 7 PGA_TO_SPKN 0 Speaker PGA Mixer to SPKOUTN select 0 = Disabled 1 = Enabled R45 (2Dh) SPK mixer control3 8 AUX_TO_SPKP_ ATTEN 0 AUX to SPKOUTP attenuation 0 = 0dB 1 = -6dB attenuation 7 PGA_TO_SPKP_ ATTEN 0 Speaker PGA Mixer to SPKOUTP attenuation 0 = 0dB 1 = -6dB attenuation R46 (2Eh) SPK mixer control4 9 IN1_TO_SPKN_ ATTEN 0 IN1 to SPKOUTN attenuation 0 = 0dB 1 = -6dB attenuation 7 PGA_TO_SPKN_ ATTEN 0 Speaker PGA Mixer to SPKOUTN attenuation 0 = 0dB 1 = -6dB attenuation Table 36 Speaker Output Control |
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