WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 146
WM8959
Manufacturer Part Number
WM8959
Description
Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet
1.WM8959.pdf
(155 pages)
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WM8959
w
R57 (39h)
Anti-Pop (2)
R58 (3Ah)
Microphone
Bias
REGISTER
ADDRESS
3
2
1
0
15:7
6
5:4
3
2
1
0
15:8
7:6
5:3
2
1
BIT
DIS_OUT3
DIS_OUT4
DIS_LOUT
DIS_ROUT
SOFTST
BUFIOEN
BUFDCOPEN
POBCTRL
VMIDTOG
MCDSCTH
[1:0]
MDCTHR
[2:0]
MCD
LABEL
0b
0b
0b
0b
0000_000
0_0b
0b
00b
0b
0b
0b
0b
00h
00b
000b
0b
0b
DEFAULT
Discharges OUT3 output via approx 500Ω resistor
0 = Not active
1 = Actively discharging OUT3
Discharges OUT4 output via approx 500Ω resistor
0 = Not active
1 = Actively discharging OUT4
Discharges LOUT output via approx 500Ω resistor
0 = Not active
1 = Actively discharging LOUT
Discharges ROUT output via approx 500Ω resistor
0 = Not active
1 = Actively discharging ROUT
Reserved - Do Not Change
Enables VMID soft start
0 = Disabled
1 = Enabled
Reserved - Do Not Change
Enables the VGS / R current generator and the analogue input
and output bias
0 = Disabled
1 = Enabled
Enables the VGS / R current generator
0 = Disabled
1 = Enabled
Selects the bias current source for output amplifiers and VMID
buffer
0 = VMID / R bias
1 = VGS / R bias
Connects VMID to ground
0 = Disabled
1 = Enabled
Reserved - Do Not Change
MICBIAS Short Circuit Current Detect Threshold
00 = 600uA
01 = 120uA
10 = 1800uA
11 = 2400uA
These values are for AVDD=3.3V and scale proportionally with
AVDD.
MICBIAS Current Detect Threshold
000 = 200uA
001 = 350uA
010 = 500uA
011 = 650uA
100 = 800uA
101 = 950uA
110 = 1100uA
111 = 1200uA
These values are for AVDD=3.3V and scale proportionally with
AVDD.
MICBIAS Current and Short Circuit Detect Enable
0 = disabled
1 = enabled
Reserved - Do Not Change
DESCRIPTION
PP, May 2008, Rev 3.1
Pre-Production
146
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