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WM9093ECS/R データシート(PDF) 27 Page - Wolfson Microelectronics plc |
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WM9093ECS/R データシート(HTML) 27 Page - Wolfson Microelectronics plc |
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27 / 84 page  Production Data WM9093 w PD, March 2012, Rev 4.2 27 HEADPHONE OUTPUT VOLUME CONTROL The headphone output PGA controls are shown in Table 10. The HPOUT1_VU bits control the loading of the headphone PGA volume data. When HPOUT1_VU is set to 0, the volume control data will be loaded into the respective control register, but will not actually change the gain setting. The headphone PGA volume settings are both updated when a 1 is written to either HPOUT1_VU bit. This makes it possible to update the gain of the left and right output paths simultaneously. A zero-cross function is provided on the headphone output PGAs. Note that the timeout clock TOCLK must be enabled when using the zero-cross function. See “Clocking Control” for more information on the TOCLK control fields. When the zero-cross function is enabled (using HPOUT1L_ZC or HPOUT1R_ZC), it will only become effective after the respective PGA gain (or mute) has been changed in two or more subsequent register writes. To guarantee zero cross functionality, it is recommended to enable zero cross and toggle the respective mute (HPOUT1L_MUTE or HPOUT1R_MUTE) before enabling the headphone output. Alternatively, the zero-cross function can be ensured by updating the PGA gain register (HPOUT1L_VOL or HPOUT1R_VOL) in two successive register writes - decrementing then incrementing the setting by 1 gain step – after the zero-cross enable bits have been set. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R28 (1Ch) Left Output Volume 8 HPOUT1_VU N/A Headphone Output PGA Volume Update Writing a 1 to this bit will update HPOUT1LVOL and HPOUT1RVOL volumes simultaneously. 7 HPOUT1L_ZC 0 Left Headphone Output PGA Zero Cross Control 0 = Change gain immediately 1 = Change gain on zero cross only 6 HPOUT1L_MUTE 0 Left Headphone Output PGA Mute 0 = Un-mute 1 = Mute 5:0 HPOUT1L_VOL [5:0] 2Dh (-12dB) Left Headphone Output PGA Volume -57dB to +6dB in 1dB steps (See Table 11 for output PGA volume control range) R29 (1Dh) Right Output Volume 8 HPOUT1_VU N/A Headphone Output PGA Volume Update Writing a 1 to this bit will update HPOUT1LVOL and HPOUT1RVOL volumes simultaneously. 7 HPOUT1R_ZC 0 Right Headphone Output PGA Zero Cross Control 0 = Change gain immediately 1 = Change gain on zero cross only 6 HPOUT1R_MUTE 0 Right Headphone Output PGA Mute 0 = Un-mute 1 = Mute 5:0 HPOUT1R_VOL [5:0] 2Dh (-12dB) Right Headphone Output PGA Volume -57dB to +6dB in 1dB steps (See Table 11 for output PGA volume control range) Table 10 Headphone Output PGA Control |
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