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Circuit Description
2-4
2-2. Key
This is consisted of key interface pins among U302, KEYSENSE_N(0:4). These signals compose the matrix.
Result of matrix informs the key status to key interface in the U302. Power on/off key is seperated from the
matrix. So power on/off signal is connected with U302 to enable U601. twelve key LED use the "VBAT" supply
voltage.
"KEY_LED_ON" signal enables LEDs with current control. "HALL_SW" informs the status of folder
(open or closed) to the. This uses the hall effect IC, A3210ELH. A magnet under main LCD enables A3210ELH.
2-3. EMI ESD Filter
This system uses the EMI ESD filter, SMF05 to protect noise from IF CONNECTOR part.
2-4. IF connetor
It is 24-pin connector. They are designed to use VBATT, CF, M_TXD0, M_RXD0, RTS, CTS, JIG_ON,
HFK_DETECT, M_RXD0, M_TXD0, , HFK_MIC-, , HFK_SPK- and GND. They connected to
power supply IC, microprocessor and signal processor IC.
3. Audio
EAR1OP and EAR1ON from U302 are connected to the main speaker. AUXOP and AUXON are connected to
the Hands free kit. MIC_P and MIC_N are connected to the main MIC. And EAR_MIC1P and EAR_MIC1N are
connected to the Earphone.
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 data bus, 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 sequence 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). For the headphone, it is provided with a stereophonic output terminal.
4. Memory
The signals in the MSM6200 enable two memories. They use only one volt supply voltage, VDD_LP from the
PM6050. This system uses AMD's memory, AM50DL128BG. It is consisted of 128M bits flash NOR memory and
32M bits SRAM memory. It has 16 bit data line, AD[0~15] which is connected to MSM6200. It has 22 bit
address lines, A[1~22]. ROM_CS and RAM_CS signals is chip select.
In the multi-media processor, it has three type memories. One is 256Mbit Nor Flash memory another is 256Mbit
NAND Flash memory and the other is 128Mbit SDRAM memory. Multi-media processor doesn't have a NAND
memory interface. But we make a software algorithm use for NAND memory.
