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LM4931 Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM4931
Description  Audio Subsystem with Mono High Efficiency Loudspeaker and Stereo Headphone Amplifiers
PDF  47 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4931 Datasheet(HTML) 18 Page - National Semiconductor (TI)

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Loudspeaker Gain Register
This register configures the loudspeaker amplifier gain and muting conditions.
DEFAULT CHART FOR LS_GAIN (04h)
DATA BIT
76543
2
1
0
DEFAULT
00000
0
0
0
LS_GAIN (04h) (SET = LOGIC 1, CLEAR = LOGIC 0)
Address
Register
Description
4:0
LS_GAIN
Programs the gain of the loudspeaker amplifier. Gain is set as follows:
4:0
Loudspeaker Gain
4:0
Loudspeaker Gain
00000
–34.5dB
10000
–10.5dB
00001
–33dB
10001
–9dB
00010
–31.5dB
10010
–7.5dB
00011
–30dB
10011
–6dB
00100
–28.5dB
10100
–4.5dB
00101
–27dB
10101
–3dB
00110
–25.5dB
10110
–1.5dB
00111
–24.5dB
10111
0dB
01000
–22.5dB
11000
1.5dB
01001
–21.5dB
11001
3dB
01010
–19.5dB
11010
4.5dB
01011
–18dB
11011
6dB
01100
–16.5dB
11100
7.5dB
01101
–15dB
11101
9dB
01110
–13.5dB
11110
10.5dB
01111
–12dB
11111
12dB
5
LS_MUTE
If set the loudspeaker amplifier is muted.
6
LS_AUTO_MUTE
If set the loudspeaker amplifier is automatically muted when the headphone sense
detects that the headphones have been connected. This uses the conditions set by
HP_SENSE_TYPE to determine if the headphones are connected.
7
LS_PWDN
If set the Class D amplifier is disabled. If an external amplifier is being used, an enable
signal can be accessed on the GPIO.
www.national.com
18



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