BSP3505D Micronas Intermetall GmbH, BSP3505D Datasheet - Page 13

• Manufacturer Part Number: BSP3505D
• Manufacturer: Micronas Intermetall GmbH

Micronas
PRELIMINARY DATA SHEET
4.4. DSP Write Registers: Functions and Values
Write registers are 16 bit wide, whereby the MSB is de-
noted bit [15]. Transmissions via I
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
The highest given positive 8-bit number (7F
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.
Volume
Loudspeaker
+12 dB
+11.875 dB
+0.125 dB
0 dB
–0.125 dB
–113.875 dB
–114 dB
Mute
Fast Mute
0000
0111 1111 0000
0111 1110 1110
0111 0011 0010 732
0111 0011 0000 730
0111 0010 1110 72E
0000 0001 0010 012
0000 0001 0000 010
0000 0000 0000 000
RESET
1111 1111 1110
hex
2
C bus have to take
[15..4]
hex
7F0
7EE
FFE
) yields in
hex
hex
hex
hex
hex
hex
hex
hex
hex
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.
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.
Clipping Mode
Loudspeaker
Reduce Volume
Reduce Tone Control
Compromise Mode
Example:
Red. Volume
Red. Tone Con.
Compromise
Vol.:
+6 dB
3
6
4.5
0000
0000
RESET
0001
0010
BSP 3505D
Bass:
+9 dB
9
6
7.5
hex
Treble:
+5 dB
5
5
5
[3..0]
0
1
2
hex
hex
hex
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