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WM8945ECS/R 数据表(PDF) 57 Page - Wolfson Microelectronics plc |
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WM8945ECS/R 数据表(HTML) 57 Page - Wolfson Microelectronics plc |
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57 / 169 page  Production Data WM8945 w PD, May 2011, Rev 4.1 57 SPEAKER OUTPUT CONTROL Each Speaker output has its own output mixer. This allows the output of the respective Speaker PGA to be enabled or disabled, and also allows the Auxiliary input AUX1 to be routed directly to either Speaker output. The two Speaker outputs can be muted also, using the SPKR_OP_MUTE and SPKL_OP_MUTE. The AUX1 path 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. When the AUX1 pin is used as an audio input, that pin must be configured for audio using the AUX1_AUDIO register bit. This bit is defined in Table 2 (see “Analogue Input Signal Path”). The Speaker Output control registers are described in Table 35. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R3 (03h) Power Management 1 9 SPKR_OP_MUTE 1 SPKOUTR Output Mute 0 = Disable Mute 1 = Enable Mute 8 SPKL_OP_MUTE 1 SPKOUTL Output Mute 0 = Disable Mute 1 = Enable Mute R43 (2Bh) SPK mixer control 1 8 AUX1_TO_SPKL 0 AUX1 Audio Input to Left Speaker Output select 0 = Disabled 1 = Enabled 7 PGAL_TO_SPKL 0 Left Speaker PGA Mixer to Left Speaker Output select 0 = Disabled 1 = Enabled R44 (2Ch) SPK mixer control 2 8 AUX1_TO_SPKR 0 AUX1 Audio Input to Right Speaker Output select 0 = Disabled 1 = Enabled 7 PGAR_TO_SPKR 0 Right Speaker PGA Mixer to Right Speaker Output select 0 = Disabled 1 = Enabled R45 (2Dh) SPK mixer control 3 8 AUX1_TO_SPKL_ ATTEN 0 AUX1 Audio Input to Left Speaker Output attenuation 0 = 0dB 1 = -6dB attenuation 7 PGAL_TO_SPKL _ATTEN 0 Left Speaker PGA Mixer to Left Speaker Output attenuation 0 = 0dB 1 = -6dB attenuation R46 (2Eh) SPK mixer control 4 8 AUX1_TO_SPKR _ATTEN 0 AUX1 Audio Input to Right Speaker Output attenuation 0 = 0dB 1 = -6dB attenuation 7 PGAR_TO_SPKR _ATTEN 0 Right Speaker PGA Mixer to Right Speaker Output attenuation 0 = 0dB 1 = -6dB attenuation Table 35 Speaker Output Control |
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