AK4627 Datasheet, PDF (23/46 Pages) Asahi Kasei Microsystems – High Performance Multi-channel Audio CODEC

[AK4627]
■ Zero Detection
The AK4627 has two pins for zero detect flag outputs. The output pin (DZF1 and DZF2 pins) for zero detection results of
each lineout channels can be selected by DZFM3-0 bits when the PS pin and DZFE pin = “L” (Table 11). Zero detection
mode is set to mode 0 when the DZFE pin= “H” regardless of the PS pin. The DZF1 pin outputs AND result of all six
channels and the DZF2 pin is disabled (“L”) at mode 0.
When the input data of all lineout channels of DZF1 (DZF2) pin are continuously zeros for 8192 LRCK cycles, the DZF1
(DZF2) pin becomes “H”. The DZF1 (DZF2) pin immediately returns to “L” if input data of any channel of DZF1 (DZF2)
pin is not zero.
Mode
DZFM
3210
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001
10 1 0 1 0
11 1 0 1 1
12 1 1 0 0
13 1 1 0 1
14 1 1 1 0
15 1 1 1 1
L1
DZF1
DZF1
DZF1
DZF1
DZF1
DZF1
DZF2
DZF1
DZF1
AOUT
R1
L2
R2
L3
DZF1 DZF1 DZF1 DZF1
DZF1 DZF1 DZF1 DZF1
DZF1 DZF1 DZF1 DZF2
DZF1 DZF1 DZF2 DZF2
DZF1 DZF2 DZF2 DZF2
DZF2 DZF2 DZF2 DZF2
DZF2 DZF2 DZF2 DZF2
disable (DZF1=DZF2 = “L”)
DZF1 DZF1 DZF1 DZF1
DZF1 DZF1 DZF1 DZF1
disable (DZF1=DZF2 = “L”)
R3
DZF1
DZF2
DZF2
DZF2
DZF2
DZF2
DZF2
DZF1
DZF1
(default)
Table 11. Zero detect control
MS1278-E-02
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2012/03