WM8944BECSSLASHR datasheet(101/165 Pages) CIRRUS

101 / 165 page

WM8944B

Rev 4.3

101

DESCRIPTION

LABEL

Mute speaker PGA and DAC.

SPK_PGA_MUTE = 1

SPK_VOL = 00h

DAC_MUTE = 1

DAC_VOL = 0

R47 (2Fh) [6]

R47 (2Fh) [5:0]

R23 (17h) [8]

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]

Disable VMID.

Delay 500ms for VMID to discharge.

VMID_ENA = 0

R7 (07h) [4]

Discharge the speaker and line outputs.

Delay 50ms for outputs to discharge.

SPKP_DISCH = 1

SPKN_DISCH = 1

LINE_DISCH = 1

R42 (2Ah) [7]

R42 (2Ah) [6]

R42 (2Ah) [4]

Mute the speaker and line outputs.

LINEOUT_MUTE = 1

SPKN_OP_MUTE = 1

SPKP_OP_MUTE = 1

R42 (2Ah) [8]

R03 (03h) [9]

R03 (03h) [8]

Disable power to speaker drivers

(must be done before disabling the speaker outputs).

SPKN_SPKVDD_ENA = 0

SPKP_SPKVDD_ENA = 0

R3 (03h) [11]

R3 (03h) [10]

Disable speaker outputs.

SPKN_OP_ENA = 0

SPKP_OP_ENA = 0

R3 (03h) [7]

R3 (03h) [6]

Reset registers to default state (software reset).

SW_RESET

R0 (00h) [15:0]

Turn off external power supply voltages.

Table 72 Recommended Power-Down Sequence

WM8944BECS/R 数据表(PDF) 101 Page - Cirrus Logic

WM8944BECS/R 数据表(HTML) 101 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载