Samsung SGH-E100 Service Manual page 8

SGH-E100 Circuit Description
when fault condition caused, "CHG_ON" signal level change low to high and charger IC stop
charging process.
8. Audio
EARP_P and EARP_N from OM6357 are connected to the main speaker. AUXSP is connected to
the Hands free kit. MIC_P and MIC_N are connected to the main MIC. And AUX_MIC_P and
AUX_MIC_N are connected to the Hands free kit.
YMU762MA3 is a LSI for portable telephone that is capable of playing high quality music by
utilizing FM synthesizer and ADPCM decoder that are included in this device.
As a synthesis, YMU762MA3 is equipped 32 voices with different tones. Since the device is
capable of simultaneously generating up to synchronous with the play of the FM synthesizer,
various sampled voices can be used as sound effects.
Since the play data of YMU762MA3 are interpreted at anytime through FIFO, the length of the
data(playing period) is not limited, so the device can flexibly support application such as incoming
call melody music distribution service. The hardware sequencer built in this device allows playing
of the complex music without giving excessive load to the CPU of the portable telephones.
Moreover, the registers of the FM synthesizer can be operated directly for real time sound
generation, allowing, for example, utilization of various sound effects when using the game
software installed in the portable telephone.
YMU762 includes a speaker amplifier with high ripple removal rate whose maximum output is
550mW (SPVDD=3.6V). The device is also equipped with conventional function including a
vibrator and a circuit for controlling LEDs synchronous with music. For the headphone, it is
provided with a stereophonic output terminal.
For the purpose of enabling YMU762MA3 to demonstrate its full capabilities, Yamaha purpose to
use "SMAF:Synthetic music Mobile Application Format" as a data distribution format that is
compatible with multimedia.
Since the SMAF takes a structure that sets importance on the synchronization between sound and
images, various contents can be written into it including incoming call melody with words that can
be used for training karaoke, and commercial channel that combines texts, images and sounds, and
others.
The hardware sequencer of YMU762MA3 directly interprets and plays blocks relevant to synthesis
(playing music and reproducing ADPCM with FM synthesizer) that are included in data distributed
in SMAF.
9. Memory
Signals in the OM6357 enable two memories. They use only one volt supply voltage, VDD3 in
the PCF50601. This system uses Samsung's memory, KBB06A300M-T402. It is consisted of
128M bits flash NOR memory and 128M bits flash NAND memory and 32M bits UtRAM. It
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