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Circuit Description
2. Baseband Circuit description of SGH-Z110V
1. PM6050
1.1. 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 seven LDO support for 2.6V, 2.8V while a self-resetting,
electronically fused switch supplies power to external accessories. Ancillary support functions, such as RTC module
and RTC charger, Clock Buffer, aid in reducing both board area and system complexity.
SBI BUS serial interface provides access to control and configuration registers. This interface gives full control of
the MSM6200 and enables system designers to maximize both standby and talk times.
Supervisory functions. including a reset generator, an input voltage monitor, and a ADC support reliable system
design. These functions work together to ensure proper system behavior during start-up or in the event of a fault
condition(low microprocessor voltage, insufficient battery energy, or excessive die temperature).
1.2 TCXO Controller and Buffers
The PM6050 IC includes circuits for controlling the TCXO warm-up and buffering its signal for distribution throughout
the handset. Performance specifications are presented below.
2. Connector
2-1. LCD Connector
LCD is consisted of main LCD(color 262K TFT LCD) and small LCD(color 65K TFT LCD). Chip select signals in the
MA55141(U501), SLCD_CS can enable small LCD and DEN for main LCD. I2C buses in MSM6200 (U301) control
white-LED of LCDs.
"SLCD_RESET, MLCD_RESET" signals initiate the Reset process of LCDs.
8-bit data lines(RGB[10:17]) transfers data and commands to Small LCD through bypass capacitor. Data and
commands use "SCLD_RS" signal. If this signal is high, Inputs to Small LCD are commands. If it is low, Inputs to
Small LCD are data. The signal which informs the input or output state to Small LCD, is required.
Main LCD interface is 18bit data lines(RGB[0:17]) CPU Interface.
"RGB_VSYNC","RGB_HSYNC","RGB_DE",and,"RGB_CLK" are the signal for transferring data.
Power signals for LCD are "2.8VDV" and "VBATT". "SPKR_P","SPKL_P", "SPKR_N" and "SPKL_N" from U602 are
used for dual audio speaker.
2-2. Key
This is consisted of key interface pins among U301, KEY_0~3 and SCAN_0~6. These signals compose the matrix.
Result of the matrix informs the key status to key interface in U301. Power on/off key is seperated from the matrix.
So power on/off signal is connected with U301 to enable U400. Eighteen key LED use the "VCC_BK" supply voltage
from U304. "HALL_SW" informs the status of folder (open or closed) to modem. This uses the hall effect IC,EM1681.
A magnet under main LCD enables EM1681. It has additional two hall-effect ICs, that are needed for camera
sensing.
One senses the rotation of Z110V camera, and the other senses the Push-pull of the camera.
2- 3
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