AK7846 Datasheet, PDF (8/16 Pages) Asahi Kasei Microsystems – Stereo Audio Class-D Amp with Power Booster for Piezo Speakers

AKEMDAKEMD CONFIDENTIAL
[AK7846]
Power-Down Control
Power supply (VBAT, DVDDI) sequences must be either (4) or (5) as follows.
(4) VBAT and DVDDI are simultaneously turned-off.
(5) First DVDDI is turned-off, Next, VBAT is turned-on.
* Simultaneous turn-off of PDN pin and DVDDI pin is prohibited. At least 1 us delay is needed before the
transision (“L”→”H”) of DVDDI pin.
z In case PDN pin is “High” and VBAT/DVDDI supply is suddenly cut off due to unexpected event, pop
noise may be detected, however, LSI will not be harmed even under such a case.
VBAT “OFF”
0V
DVDDI “OFF”
> 1us
0V
PDN pin
0V
Power-Down Sequence (4)
///_{VBAT “OFF”}
>0
0V
DVDDI “OFF”
> 1us
0V
PDN pin
0V
Power –Down Sequence (5)
CAUTION: The performance of the device will not be guaranteed after the sequence below.
(5) First VBAT is turned-off, Next, DVDDI is turned-off.
Rev.04.9
–8–
2008/03