Samsung SGH-ZV30 Service Manual page 7

2-2. Baseband Circuit description of SGH-ZV30
2-2-1. PM6650
- Power Management
Ten low-dropout regulators designed specifically for GSM applications power the terminal and help ensure
optimal system performance and long battery life. It provides LDOs support for 1.375V, 1.8V, 2.6V,
2.85V,3.3V.IC-level interfaces include the three-line serial bus interface(SBI) used by the MSM6250 device to
control and status the PM6650 IC.
- TCXO Controller and Buffers
The PM6650 IC includes circuits for controlling the TCXO warm-up and buffering its signal for distribution
throughout the handset. Performance specifications are presented below.
2-2-2. Connector
- LCD Connector
LCD is consisted of main LCD(color 262K TFT LCD) and small LCD(OLED color 65K LCD). Chip select
signals in the U302, MAIN_LCD_CSB can enable main LCD and SUB_LCD_CSB can enable small
LCD.Dimming signal enables white LED of main LCD and Dimming Control. C_Main_LCD_RESETB signal
initiates the reset process of the main LCD. C_SUB_LCD_RESETB signal initiates the Reset process of the
small LCD. 16-bit data lines(D2(0)~D(15)) transfers data and commands to LCD. Data and commands use
"C_A2(1)" signal. If this signal is high, Inputs to LCD are commands. If it is low, Inputs to LCD are data.
The signal which informs the input or output state to LCD, is required. But this system is not necessary this
signal. Power signals for LCD are "VBATT and VREG_MSMP". "EAR1OP" and "EAR1ON" are used for audio
speaker. And "MOTOR_EN" from U302 enables the motor.
- Key
This is consisted of key interface pins among U302, KEY_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.
The key LED use the "VBATT" 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, EM1681
- EMI ESD Filter
This system uses the EMI ESD filter, GMF05LC to protect noise from IF CONNECTOR part.
- IF connector
It is 24-pin connector. They are designed to use VBATT, CF, UART1_TX, UART1_RX, UART1_RFR,
UART1_CTS, JIG_ON, RTCK, TCK, TDI, TDO, TMS and GND. They connected to power supply
IC,microprocessor and signal processor IC.
2-2-3. Audio
EAR1OP and EAR1ON from U302 are connected to the main Receiver. MIC1P and MIC1N are connected to
the main MIC. And MIC2P and MIC2N are connected to the Earphone. YMU769 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.
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2-3
Circuit Description