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WM8904ECS/R 数据表(PDF) 143 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 143 Page - Wolfson Microelectronics plc |
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143 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 143 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION REFER TO R6 (06h) Mic Bias Control 0 6:4 MICDET_THR [2:0] 000 MICBIAS Current Detect Threshold (AVDD = 1.8V) 000 = 0.070mA 001 = 0.260mA 010 = 0.450mA 011 = 0.640mA 100 = 0.830mA 101 = 1.020mA 110 = 1.210mA 111 = 1.400mA Note that the value scales with AVDD. The value quoted is correct for AVDD=1.8V. Electret Condenser Microphone Interface 3:2 MICSHORT_T HR [1:0] 00 MICBIAS Short Circuit Threshold (AVDD = 1.8V) 00 = 0.520mA 01 = 0.880mA 10 = 1.240mA 11 = 1.600mA Note that the value scales with AVDD. The value quoted is correct for AVDD=1.8V. Electret Condenser Microphone Interface 1 MICDET_ENA 0 MICBIAS Current and Short Circuit Detect Enable 0 = disabled 1 = enabled Electret Condenser Microphone Interface 0 MICBIAS_ENA 0 MICBIAS Enable 0 = disabled 1 = enabled Electret Condenser Microphone Interface Register 06h Mic Bias Control 0 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION REFER TO R7 (07h) Mic Bias Control 1 2:0 MICBIAS_SEL [2:0] 000 Selects MICBIAS voltage 000 = 9/10 x AVDD (1.6V) 001 = 10/9 x AVDD (2.0V) 010 = 7/6 x AVDD (2.1V) 011 = 4/3 x AVDD (2.4V) 100 to 111 = 3/2 x AVDD (2.7V) Note that the voltage scales with AVDD. The value quoted in brackets is correct for AVDD=1.8V. Electret Condenser Microphone Interface Register 07h Mic Bias Control 1 |
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