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WM8945ECS/R 数据表(PDF) 107 Page - Wolfson Microelectronics plc |
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WM8945ECS/R 数据表(HTML) 107 Page - Wolfson Microelectronics plc |
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107 / 169 page  Production Data WM8945 w PD, May 2011, Rev 4.1 107 Power Down: ACTION 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 LINEL_DISCH = 1 R42 (2Ah) [7] R42 (2Ah) [6] R42 (2Ah) [4] Mute outputs LINEL_MUTE = 1 SPKR_OP_MUTE = 1 SPKL_OP_MUTE = 1 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 SPKR_OP_ENA = 1 SPKL_OP_ENA = 1 R3 (03h) [7] R3 (03h) [6] Reset SW_RESET R0 (00h) [15:0] Turn off external power supply voltages SOFTWARE RESET AND DEVICE ID The WM8945 can be reset by writing to Register R0. This is a read-only register, and the contents of R0 will not be affected by writing to this Register. The Device ID can be read back from Register R0. The Chip Revision ID can be read back from Register 1, as described in Table 71. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R0 (00h) Software Reset/Chip ID 1 15:0 SW_RESET [15:0] 6229h Writing to this register resets all registers to their default state. Reading from this register will indicate device family ID 6229h. R1 (01h) Revision Number 3:0 CHIP_REV [3:0] Reading from this register will indicate the Revision ID. Table 71 Chip Reset and ID |
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