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Circuit Description
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2-3
2-2. SGH-Z150 Baseband Circuit description
2-2-1. PM6650-2
- 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 1.375V, 1.8V, 2.6V, 2.85V, 3.0V, 3.3V
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
MSM6250A and enables system designers to maximize both standby and talk times.
Supervisory functions. including a reset generator, an input voltage monitor, and a ADC Conertte 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).
- TCXO Controller and Buffers
The PM6650-2 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 has 1.9", 176x220 resolution (color 260K TFT LCD). Chip select signals in MSM6250A, MAIN_LCD_CS can
enable main LCD and MAIN_LCD_BACKLIGHT enables white LED of main LCD. nRESET_LCD signal initiates the
reset process of the main LCD.
-Key
This is consisted of key interface pins among MSM6250A IC, KYPD_N(9,11,13,15,17) and KEYSENSE(0:3). These
signals compose the matrix. Result of matrix informs the key status to key interface in the MSM6250A. Power on/off
key(PHONE_ON) is separated from the matrix. The key LED use the "VREG_KEY_LED" supply voltage.
- ESD Filter
This system uses the ESD filter(GMF05LC) and ESD-EMI filter(ICVE21184E070R101FR) to protect noise from
CONNECTORs and part.
- IF connetor and EAR-JACK
It is 20-pin connector and is compatibly used for IF connector or EAR-JACK. They are designed to use VBATT,
USB_VBUS, VEXT_5V, JTAG_SEL, TDO_TX, TDI_RX, JIG_ON, USB_D+, USB_D-, EAR_MICP, EAR_MIC_N,
TRST_EARR, TMS_EAR, TCK_EARSW, RTCK_JACKINT, ADC_BOOTSW. They are connected to power supply IC,
microprocessor and signal processor IC.
