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Circuit Description
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2-3
signal is connected with PCF50601 to enable PCF50601. Fifteen key LEDs
are use the "VBAT" as supply voltage.
"VDD_KEY" signal enables LEDs. "FLIP" informs the status of folder (open or closed) to the OM6359. This uses the
hall effect IC, SH248CSP.
A magnet under main LCD enables SH248CSP.
4. EMI ESD Filter
This system uses the EMI ESD filter, EMIF09 to protect noise from IF CONNECTOR part.
5. IF connetor
It is 18-pin connector. They are designed to use VBAT, V_EXT_CHARGE, TXD0, RXD0, RTS0, CTS0, JIG_REC,
CHARGER_OK, RXD1, TXD1, AUX_MIC, AUX_SPK and GND. They connected to power supply IC, microprocessor
and signal processor IC.
6. Battery Charge Management
A complete constant-current/constant-voltage linear charger is used for single cell lithium-ion batteries.
If TA connected to phone, "V_EXT_CHARGE" enable charger IC and supply current to battery.
When fault condition caused, "CHG_ON" signal level change low to high and charger IC stop charging
process.
7. Audio
EARP_P and EARP_N from OM6359 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.
YMU762C 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, YMU762C 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 YMU762C 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.
YMU762C 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 YMU762C 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 YMU762C directly interprets and plays blocks relevant
to synthesis (playing music and reproducing ADPCM with FM synthesizer) that are included in data distributed in SMAF.
