AK7846 Datasheet, PDF (7/16 Pages) Asahi Kasei Microsystems – Stereo Audio Class-D Amp with Power Booster for Piezo Speakers

AKEMDAKEMD CONFIDENTIAL
[AK7846]
„ Power Control
OPERATION OVERVIEW
The AK7848 enters SHUT-DOWN MODE by setting PDN pin to Logic “Low” level.
Power-Up Control
Power supply (VBAT pin, DVDDI pin) sequence must be either (1) or (2) as follows.
(1) VBAT and DVDDI are simultaneously turned on.
(2) First, VBAT pin is turned on. Next, DVDDI is turned on.
z Simultaneous turn-on of DVDDI pin and PDN pin is prohibited. At least 1 us delay is needed before the
transision (“L”→”H”) of PDN pin.
VBAT “ON” _0V
DVDDI “ON” _0V
> 1us
PDN pin
0V
Power-Up Sequence (1)
VBAT “ON” _0V
>0
DVDDI “ON” _00VV
> 1us
PDN pin
0V
Power –Up Sequence (2)
CAUTION: The performance of the device will not be guaranteed after the sequence below.
(3) First, DVDDI pin = ”H”, Next VBAT = ”H”
Rev.04.9
–7–
2008/03