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WM8985GEFL/R データシート(PDF) 88 Page - Wolfson Microelectronics plc |
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WM8985GEFL/R データシート(HTML) 88 Page - Wolfson Microelectronics plc |
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88 / 118 page  WM8985 Pre-Production w PP, Rev 3.4, October 2006 88 VMID The analogue circuitry will not operate unless VMID is enabled. The impedance of the VMID resistor string, together with the decoupling capacitor on the VMID pin will determine the start-up time of the VMID circuit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 (01h) Power management 1 1:0 VMIDSEL 00 Reference string impedance to VMID pin (Determines startup time): 00 = off (250kΩ VMID to AGND1) 01 = 100kΩ 10 = 500kΩ 11 = 10kΩ (for fast startup) Table 51 VMID Impedance Control BIASEN The analogue amplifiers will not operate unless BIASEN is enabled. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 (01h) Power management 1 3 BIASEN 0 Analogue amplifier bias control 0 = disabled 1 = enabled Table 52 Analogue Bias Control |
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