BD28623MUV Datasheet, PDF (34/53 Pages) Rohm – Class D Speaker Amplifier for Digital Input

BD28623MUV
(6) Clock Stop Protection (MCLK)
This IC has clock stop protection circuit that mutes the speaker output when the MCLK signal of the digital audio input
stops.
Detecting condition - It will detect when MUTEX pin is set High and the MCLK signal stops for about 1µsec or more.
Speaker output turns MUTE immediately when clock stop protection is detected.
Releasing condition - It will release when MUTEX pin is set High and the MCLK signal returns to the normal clock
operation. The speaker output is outputted through a soft-start when released. (Auto recovery)
Clock stop
Clock recover
MCLK
OUT1P
OUT1N
OUT2P
OUT2N
Protection start with
About 1µsec clock stop
High-Z_Low
Speaker
Output
t
t
Soft-start(Auto recovery)
21.5msec(fS=48kHz)
t
ERROR
3.3V
t
Figure 66. Clock Stop Protection (MCLK) Sequence
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20.May.2016 Rev.002