BU94501AMUV Datasheet, PDF (66/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
●Notes for use
(1)Power on Reset
Please keep the terminal RESETX at the Low level when the power supply starts. Please make the terminal RESETX High
level after 100us after 3.3V system power supply and the oscillation of the system clock is steady. Moreover, please make
the terminal RESETX Low level during 100us or more when resetting it while operating.
(2) About compatibility in USB memory device and SD memory card
According to the file structure and communication speed of an USB memory, SD memory card, this LSI might not play back
correctly.
(3) About turning on the power supply
Current rush might flow momentarily by the order of turning on the power supply and the delay in IC with two or more power
supplies, and note the capacity of the power supply coupling, the power supply, and width and drawing the GND pattern
wiring.
(4) About absolute maximum rating
When the absolute maximum rating such as the applied voltage and the ranges of the operating temperature
is exceeded, LSI might be destroyed. Please apply neither voltage nor the temperature that exceeds the
absolute maximum rating. Please execute physical measures for safety such as fuse when it is thought to
exceed the absolute maximum rating, and examine it so that the condition to exceed the absolute maximum
rating is not applied to LSI.
(5) About GND Voltage
In any state of operation must be the lowest voltage about the voltage of the terminal GND. Please actually confirm the
voltage of each terminal is not a voltage that is lower than the terminal GND including excessive phenomenon.
(6) About design of overheating malfunction preventive circuit
Please design overheating malfunction preventive circuit with an enough margin in consideration of a permissible loss in the
state of using actually.
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions.
VQFN040V6060 package（BU94501AMUV / BU94502AMUV）exposes its frame of the backside of package. Note that this
part is assumed to use after providing heat dissipation treatment to improve heat dissipation efficiency. Try to occupy as
wide as possible with heat dissipation pattern not only on the board surface but also the backside.
(7) About the short between terminals and the mounting by mistake
Please note the direction and the gap of position of LSI enough about LSI when you mount on the substrate.
LSI might be destroyed when mounting by mistake and energizing. Moreover, LSI might be destroyed when short-circuited
by entering of the foreign substances between the terminal and GND, between terminals, between the terminal and the
power supply of LSI.
(8) About operation in strong electromagnetic field
Use in strong electromagnetic field has the possibility of malfunctioning and evaluate it enough, please.
(9) Browsing operation
With a memory with slow access speed, Browsing operation during music playing may generate skipping.
(10) Playing time of MP3 file
The playing time when it can be acquired at the time of playing the MP3 file, may shift when fast forward playing, rewinding
playing, and VBR playing.
(11) About WMA
Windows Media Audio is the music compression technology which Microsoft Corp. developed.
Windows Media is the registered trademark of U.S. Microsoft Corporation in the U.S., and other countries.
(12) About I²C format I/F
Although this LSI has adopted the I²C format, the level shifter circuit is not built in.
For this reason, level shifter is needed for connection with the device besides the range of operating power supply voltage
of this LSI.
(13) About " Made for iPod / iPhone / iPad License "
For using of BU94502AMUV / BU94502AKS2, It is necessary to become a licensee of Apple Inc. regarding "Made for
iPod/iPhone/iPad License"
Status of this document
The Japanese version of this document is the formal specification. A customer may use this translation version only for a
reference.
to help reading the formal version. If there are any differences in translation version of this document, formal version takes
priority.
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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0V2V0E600070-1-2
2012.12.10 Rev.003