VS1103B Datasheet, PDF (43/61 Pages) List of Unclassifed Manufacturers – MIDI/ADPCM AUDIO CODEC

VLSI
Solution ^y
VS1103b
VS1103B
7. OPERATION
7.8.1 Sine Test
Sine test is initialized with the 8-byte sequence 0x53 0xEF 0x6E n 0 0 0 0, where n defines the sine test
to use. n is defined as follows:
Name
F _sIdx
S
n bits
Bits Description
7:5 Sample rate index
4:0 Sine skip speed
F _sIdx
0
1
2
3
4
5
6
7
F_s
44100 Hz
48000 Hz
32000 Hz
22050 Hz
24000 Hz
16000 Hz
11025 Hz
12000 Hz
The
frequency
of the
sine
to
be output
can
now be
calculated
from
F
=
F_s
×
S
128
.
Example: Sine test is activated with value 126, which is 0b01111110. Breaking n to its components,
F _sIdx = 0b011 = 3 and thus F _s = 22050Hz. S = 0b11110 = 30, and thus the final sine frequency
F
=
22050H z
×
30
128
≈
5168H z .
To exit the sine test, send the sequence 0x45 0x78 0x69 0x74 0 0 0 0.
Note: Sine test signals go through the digital volume control, so it is possible to test channels separately.
7.8.2 Pin Test
Pin test is activated with the 8-byte sequence 0x50 0xED 0x6E 0x54 0 0 0 0. This test is meant for chip
production testing only.
Version 1.01, 2007-09-03
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