BU94603KV Functional Specifications
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Target Spec 0.12
V.6 SEL_APLAY
Auto play selection signal at power ON/device recognition
Signal name I/O
Function
Remarks
SEL_APLAY
I
Auto play selection signal at
device recognition
H: Stop after recognizing device, H: Play after
recognizing device
SEL_APLAY selects whether the audio data in the memory is to be automatically played when a memory
device (USB memory or SD card) is inserted at power ON or when the system recognizes the memory
device inserted.
SEL_APLAY can be selected only in MODE1. Since selection of SEL_APLAY is ignored in MODE2/3,
select it from Pull-up. When MODE2/3 is selected, audio data is halted after the system recognizes a
device.
V.7 SEL_UTPKT
USB test packet
Signal name I/O
Function
Remarks
SEL_UTPKT
I USB test packet send
H: Disabled, L: USB test packet send
A test packet signal is output from USB_DP terminal or USB_DM terminal when L is set to SEL_UTPKT at
power ON.
Once enabled, SEL_UTPK keeps that state regardless of operation modes and sends out a test packet.
A test packet signal is continuously output until power turns OFF. Use SEL_UTPKT when evaluating the
USB terminal. In other cases, use it from Pull-up.
V.8 Audio output
Audio output
Signal name I/O
Function
Remarks
LDACO
O Lch audio line output
-
RDACO
O Rch audio line output
-
These signals are decoded MP3 music audio data line outputs.
They turn ON when the line output is selected by SEL_DOUT terminal.
V.9 MUTE control output
Audio MUTE
Signal name I/O
Function
Remarks
AMUTE
O Audio mute control terminal
H: At audio output, L: At mute
This is a control terminal to mute audio output at power ON or FF/FB (silence).
This terminal outputs H at audio output and L at mute.
Figure
Ⅴ
.9 shows the operation waveform.
Figure V.9 Waveform at Audio Mute
LDACO, RDACO
AMUTE
When starting playing
When stopping playing
23 ms at 0dB
23 ms at 0dB
