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WM8904ECS/R 数据表(PDF) 45 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 45 Page - Wolfson Microelectronics plc |
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45 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 45 A clock is required for the digital filtering function, and the DC Servo must also be running. This requires: MCLK is present or the FLL is selected as the SYSCLK source in free-running mode CLK_SYS_ENA = 1 DCS_ENA_CHAN_n is enabled (where n = 0, 1, 2 or 3) Any MICBIAS Current Detect event (accessory insertion/removal or hookswitch press/release) which happens while one or more of the clocking criteria is not satisfied (for example during a low power mode where the CPU has disabled MCLK) will still be detected, but only after the clocking conditions are met. An example is illustrated in Figure 25, where the mic is inserted while MCLK is stopped. Figure 25 MICBIAS Detection events without MCLK |
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