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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" 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.
YMU765 has a built-in amplifier, and thus, is an ideal device for outputting sounds that are used by mobile
phones in addition to game sounds and ringing melodies that are replayed by a synthesizer.
The synthesizer section adopts "stereophonic hybrid synthesizer system" that are given advantages of both FM
synthesizers and Wave Table synthesizers to allow simultaneous generation of up to 32 FM voices and 32 Wave
Table voices. Furthermore, YMU765 has a built-in hardware sequencer that helps to realize complex play without
heavily loading the host CPU. And this device also has a built-in circuit for controlling vibrators and LEDs
synchronizing with play of music. The consumed electric current can be stopped to the minimum by power down
mode when not operating.
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.
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.
