BU7831KN_06 Datasheet, PDF (12/17 Pages) Rohm – Voice/Audio Mixer & Selector

●Recommended operation sequence
VDD ON
NRST＝L start. Rise up VDD first.
After the mode setting, input the audio signal.
VDD
NRST
CPU I/F
Audio Signal
Fig. 30
Mode Set
Analog Signal
VDD OFF
HPRST=0(82h=00h) is taken at the time of use of HPAMP first.
VDD OFF, after the mute on setting（88h=FFh）, NRST=L at using HPAMP.
VDD OFF, after NRST=L at not using HPAMP.
HPRST(82h)
01h
00h
ATT6L,R(88h) XXh
FFh
NRST
VDD
Headphone output
Fig. 31
HPAMP ON
Mute OFF (HPRST 82h bit0), after the mode setting.
CPU I/F
Mode Set
Headphone output（DC）
HPRST (82h bit0)
Thpout
Thsmute
Fig. 32
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