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WM8941 データシート(PDF) 49 Page - Wolfson Microelectronics plc |
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WM8941 データシート(HTML) 49 Page - Wolfson Microelectronics plc |
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49 / 96 page  Pre Production WM8941 w PP, Rev 3.3, December 2007 49 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 7 MONOATTN 0 Attenuation control for bypass path (output of input boost stage) to mono mixer input 1 0 = 0dB 0 1 = -10dB 6 MONOMUTE 0 0=No mute 1=Output muted. During mute the mono output will output VMID which can be used as a DC reference for a headphone out. 2 AUX2MONO 0 Output of Auxillary amplifier to mono mixer input: 0 = not selected 1 = selected 1 BYP2MONO 0 Bypass path (output of input boost stage) to mono mixer input 0 = non selected 1 = selected R56 Mono mixer control 0 DAC2MONO 0 Output of DAC to mono mixer input 0 = not selected 1 = selected Table 37 Mono Mixer Control ENABLING THE OUTPUTS Each analogue output of the WM8941 can be separately enabled or disabled. The analogue mixer associated with each output has a separate enable. All outputs are disabled by default. To save power, unused parts of the WM8941 should remain disabled. Outputs can be enabled at any time, but it is not recommended to do so when BUFIO is disabled (BUFIOEN=0), as this may cause pop noise (see “POP Minimisation” section). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 3 BIASEN 0 Analogue amplifiers bias enable R1 Power management 1 2 BUFIOEN 0 VMID buffer enable 7 MONOEN 0 MONOOUT enable 6 SPKNEN 0 SPKOUTN enable 5 SPKPEN 0 SPKOUTP enable 3 MONOMIXEN 0 Mono mixer enable R3 Power management 3 2 SPKMIXEN 0 Speaker Mixer enable Note: All “Enable” bits are 1 = ON, 0 = OFF Table 38 Output Stages Power Management Control UNUSED ANALOGUE INPUTS/OUTPUTS Whenever an analogue input/output is disabled, it remains connected to AVDD/2 through a resistor. This helps to prevent pop noise when the output is re-enabled. The resistance between the voltage buffer and the output pins can be controlled using the VROI control bit. The default impedance is low, so that any capacitors on the outputs can charge up quickly at start-up. If a high impedance is desired for disabled outputs, VROI can then be set to 1, increasing the resistance to about 30k Ω. |
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