VS1103B datasheet(32/61 Pages) ETC2

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VLSI

Solution

VS1103b

VS1103B

6. FUNCTIONAL DESCRIPTION

of the users earphones without causing clipping.

VSBE is activated when SB AMPLITUDE is non-zero. SB AMPLITUDE should be set to the user’s

preferences, and SB FREQLIMIT to roughly 1.5 times the lowest frequency the user’s audio system can

reproduce. For example setting SCI BASS to 0x00a6 will give 15 dB enhancement below 60 Hz.

Note: Because VSBE tries to avoid clipping, it gives the best bass boost with dynamical music material,

or when the playback volume is not set to maximum. It also does not create bass from nothing: the

source material must have some bass to begin with.

Treble Control VSTC is activated when ST AMPLITUDE is non-zero. For example setting SCI BASS

to 0x7a00 will give 10.5 dB treble enhancement above 10 kHz.

Bass Enhancer uses about 3.0 MIPS and Treble Control 1.2 MIPS at 44100 Hz sample rate. Both can be

on simultaneously.

6.6.4 SCI CLOCKF (RW)

SCI CLOCKF is used to control the internal clock of VS1103b.

SCI CLOCKF bits

Name

Bits

Description

SC MULT

15:13

Clock multiplier

SC ZERO

12:11

Set to zero

SC FREQ

10: 0

Clock frequency

SC MULT activates the built-in clock multiplier. This will multiply XTALI to create a higher CLKI.

The values are as follows:

SC MULT

MASK

CLKI

0x0000

XTALI

0x2000

XTALI×1.5

0x4000

XTALI×2.0

0x6000

XTALI×2.5

0x8000

XTALI×3.0

0xa000

XTALI×3.5

0xc000

XTALI×4.0

0xe000

XTALI×4.5

SC FREQ is used to tell if the input clock XTALI is running at something else than 12.288 MHz. XTALI

is set in 4 kHz steps. The formula for calculating the correct value for this register is XT ALI−8000000

4000

(XTALI is in Hz).

Note: As opposed to some other VS10XX chips, a software reset must be performed after SCI CLOCKF

has been set. It is recommended that SCI CLOCKF is set only after each hardware reset / startup.

Note: The default value 0 is assumed to mean XTALI=12.288 MHz.

Version 1.01, 2007-09-03

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