BSP3505D datasheet(13/40 Pages) MICRONAS

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BSP 3505D

PRELIMINARY DATA SHEET

Micronas

4.4. DSP Write Registers: Functions and Values

Write registers are 16 bit wide, whereby the MSB is de-

noted 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 control 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!

4.4.1. Volume Loudspeaker Channel

Volume

Loudspeaker

0000hex

[15..4]

+12 dB

0111 1111 0000

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

The highest given positive 8-bit number (7Fhex) yields in

a maximum possible gain of 12 dB. Decreasing the vol-

ume register by 1 LSB decreases the volume by 1 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 BSP 3505D loudspeaker volume function is divided

up in 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 before Fast

Mute was activated.

Clipping Mode

Loudspeaker

0000hex

[3..0]

Reduce Volume

0000

0hex

RESET

Reduce Tone Control

0001

1hex

Compromise Mode

0010

2hex

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

lowing clipping procedure is used: To prevent severe

clipping effects with bass or treble boosts, the internal

volume is automatically limited to a level where, in com-

bination with either bass or treble setting, the amplifica-

tion 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 clipping mode is “Compromise Mode”, the bass or

treble value and volume are reduced half and half if am-

plification exceeds 12 dB.

Example:

Vol.:

+6 dB

Bass:

+9 dB

Treble:

+5 dB

Red. Volume

Red. Tone Con.

Compromise

4.5

7.5

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