MSP3410D datasheet(40/83 Pages) MICRONAS

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MSP 34x0D

PRELIMINARY DATA SHEET

Micronas

7.3. DSP Write Registers: Functions and Values

Write registers are 16 bit wide, whereby the MSB is

denoted bit [15]. Transmissions via I2C bus have to

take place in 16-bit words. Some of the defined 16-bit

words are divided into low [7...0] and high [15...8] byte,

or in an other manner, thus holding two different con-

trol entities. All write registers are readable. Unused

parts of the 16-bit registers must be zero. Addresses

not given in this table must not be written at any time!

7.3.1. Volume – Loudspeaker and

Headphone Channel

The highest given positive 12-bit number (7F0hex)

yields in a maximum possible gain of 12 dB. Decreas-

ing the volume register by 2 LSBs decreases the vol-

ume by 0.125 dB. Volume settings lower than the

given minimum mute the output. With large scale input

signals, positive volume settings may lead to signal

clipping.

The MSPD loudspeaker and headphone volume func-

tion is divided up into a digital and an analog section.

With Fast Mute, volume is reduced to mute position by

digital volume only. Analog volume is not changed.

This reduces any audible DC plops. Going back from

Fast Mute should be done to the volume step which

was in existence before Fast Mute was activated.

The Fast Mute facility is activated by the I2C com-

mand. After 75 ms (typically), the signal is completely

ramped down.

If the clipping mode is set to “Reduce Volume”, the fol-

lowing clipping procedure is used: To prevent severe

clipping effects with bass, treble, or equalizer boosts,

the internal volume is automatically limited to a level

where, in combination with either bass, treble, or

equalizer setting, the amplification does not exceed

12 dB.

If the clipping mode is “Reduce Tone Control”, the bass

or treble value is reduced if amplification exceeds

12 dB. If the equalizer is switched on, the gain of those

bands is reduced, where amplification together with

volume exceeds 12 dB.

If the clipping mode is “Compromise Mode”, the bass

or treble value and volume are reduced half and half if

amplification exceeds 12 dB. If the equalizer is

switched on, the gain of those bands is reduced half

and half, where amplification together with volume

exceeds 12 dB.

Volume

Loudspeaker

0000hex

[15...4]

Volume

Headphone

0006hex

[15...4]

+12 dB

0111 1111 00001) 7F0hex

+11.875 dB

0111 1110 1110

7EEhex

+0.125 dB

0111 0011 0010

732hex

0 dB

0111 0011 0000

730hex

−0.125 dB

0111 0010 1110

72Ehex

−113.875 dB

0000 0001 0010

012hex

−114 dB

0000 0001 0000

010hex

Mute

0000 0000 0000

000hex

RESET

Fast Mute

1111 1111 1110

FFEhex

1) Bit[4] must always be set to 0

Clipping Mode

Loudspeaker

0000hex

[3..0]

Clipping Mode

Headphone

0006hex

[3..0]

Reduce Volume

0000

0hex

RESET

Reduce Tone Control

0001

1hex

Compromise Mode

0010

2hex

Example:

Vol.:

+6 dB

Bass:

+9 dB

Treble:

+5 dB

Red. Volume

Red. Tone Con.

Compromise

4.5

7.5

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