VS1103B datasheet(43/61 Pages) ETC2

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VLSI

Solution

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:

n bits

Name

Bits

Description

F sIdx

7:5

Sample rate index

4:0

Sine skip speed

F sIdx

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 = 22050Hz × 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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