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WM8946ECS/R Datasheet(PDF) 107 Page - Wolfson Microelectronics plc |
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WM8946ECS/R Datasheet(HTML) 107 Page - Wolfson Microelectronics plc |
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107 / 175 page  Production Data WM8946 w PD, July 2012, Rev 4.3 107 DESCRIPTION LABEL REGISTER [BITS] LDO_BIAS_SRC = 0 R53 (35h) [5] Set VMID for normal operation VMID_FAST_START = 0 STARTUP_BIAS_ENA = 0 R7 (07h) [11] R7 (07h) [8] Set VMID divider for normal operation VMID_SEL = 01 R2 (02h) [1:0] Table 69 Recommended Power-Up Sequence DESCRIPTION LABEL REGISTER[BITS] Mute speaker PGA and DAC SPKR_PGA_ENA = 1 SPKL_PGA_ENA = 1 SPKR_VOL = 00h SPKL_VOL = 00h DACR_MUTE = 1 DACL_MUTE = 1 DACR_VOL = 0 DACL_VOL = 0 R3 (03h) [13] R3 (03h) [12] R47 (2Fh) [5:0] R48 (30h) [5:0] R24 (18h) [8] R23 (17h) [8] R24 (18h) [7:0] R23 (17h) [7:0] Select LDO for fast start-up LDO_REF_SEL_FAST = 1 LDO_BIAS_SRC = 1 R53 (35h) [14] R53 (35h) [5] Select VMID for fast start-up VMID_SEL = 11 VMID_FAST_START =1 BIAS_SRC = 1 VMID_RAMP = 01 R2 (02h) [1:0] R7 (07h) [11] R7 (07h) [7] R7 (07h) [6:5] Disabled VMID Delay 500ms for VMID to discharge VMID_ENA = 0 R7 (07h) [4] Discharge outputs Delay 50ms for outputs to discharge SPKR_DISCH = 1 SPKL_DISCH = 1 LINER_DISCH = 1 LINEL_DISCH = 1 R42 (2Ah) [7] R42 (2Ah) [6] R42 (2Ah) [5] R42 (2Ah) [4] Mute outputs LINER_MUTE = 1 LINEL_MUTE = 1 SPKR_OP_MUTE = 1 SPKL_OP_MUTE = 1 R42 (2Ah) [9] R42 (2Ah) [8] R03 (03h) [9] R03 (03h) [8] Disable power to speaker driver (must be done before disabling the speaker outputs) SPKR_SPKVDD_ENA = 1 SPKL_SPKVDD_ENA = 1 R3 (03h) [11] R3 (03h) [10] Disable speaker outputs SPKN_OP_ENA = 1 SPKP_OP_ENA = 1 R3 (03h) [7] R3 (03h) [6] Reset SW_RESET R0 (00h) [15:0] Turn off external power supply voltages Table 70 Recommended Power-Down Sequence |
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