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LM4931 Datasheet(PDF) 17 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 Loudsperker and Stereo Headphone Amplifiers
PDF  48 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4931 Datasheet(HTML) 17 Page - National Semiconductor (TI)

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Headphone Gain Registers
This register is used to control the gain of the headphone amplifier.
DEFAULT CHART FOR HP_GAIN (03h)
DATA BIT
7654321
0
DEFAULT
0
000000
0
HP_GAIN (03h) (SET = LOGIC 1, CLEAR = LOGIC 0)
Address
Register
Description
4:0
HP_GAIN
Programs the gain of the headphone amplifier. Gain is set as follows:
4:0
Headphone Gain
4:0
Headphone Gain
00000
–46.5dB
10000
–22.5dB
00001
–45dB
10001
–21dB
00010
–43.5dB
10010
–19.5dB
00011
–42dB
10011
–18dB
00100
–40.5dB
10100
–16.5dB
00101
–39dB
10101
–15dB
00110
–37.5dB
10110
–13.5dB
00111
–36dB
10111
–12dB
01000
–34.5dB
11000
–10.5dB
01001
–33dB
11001
–9dB
01010
–31.5dB
11010
–7.5dB
01011
–30dB
11011
–6dB
01100
–28.5dB
11100
–4.5dB
01101
–27dB
11101
–3dB
01110
–25.5dB
11110
–1.5dB
01111
–23dB
11111
0dB
5
HP_MUTE
If set the headphone amplifier is muted.
6
HP_SENSE_TYPE
Defines if a high or low voltage at the HP_SENSE pin should indicate that a
headphone is plugged in.
HP_SENSE_TYPE
HP_SENSE_IN
0
High = HP Plugged In
1
Low = HP Plugged In
The HP_SENSE_OUTPUT signal can be configured to appear on the GPIO pin.
7
HP_SENSE_OUTPUT If set, the polarity of the HP_CONNECTED output from the GPIO pin is reversed, so if
the headphone is connecteda0is reported on the GPIO rather than a 1. This does not
alter the operation of the loudspeaker auto-muting function (as defined in Loudspeaker
Gain Register)
www.national.com
17



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