Lg Electronics LGC500W Manual De Usuario

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LGIC

LG Information & Communications, Ltd.

LDO for TX part is enable on IDLE state, and gives the power TX part devices. But PAM is given the power

directly from Batt.

LDO for RX part is enable on SLEEP state, and gives the power RX part devices and PLL block.

LDO for audio part is enable on audio enable state, and gives the power Codec.

When the PWR key is pressed during a few seconds, Q8(DTC144EE) is turned on by ON_SW and then, 'Low' is

outputted on ON_SW_S/. MSM3000 receives this signal and then, recognizes that the POWER key has been

pressed. During this time, MSM3000 outputs PS_HOLD as low and turn off all devices

The Logic part consists of internal CPU of MSM3000, RAM, ROM and EEPROM.

The MSM3000 receives TCXO/4 clock(19.68Mz) and CHIPX8 clock signals from the IFR3000, and then

controls the phone during the CDMA and the FM mode. The major components are as follows:

  CPU : ARM7TDMI core

  MEMORY :

      

•

 FLASH Memory : 16M bits

      

•

 STATIC RAM : 4M bits

      

•

 EEPROM : 265kbits

ARM7TDMI 32-bit microprocessor is used and CPU controls all the circuitry. Some of the features of the

ARM microprocessor include a 3 stage pipelined RISC architecture, both 32-bit ARM and 16bit THUMB

instruction setsm, a 32-bit address bus, and a 32-bit internal data bus.

Flash Memory is used to store the program of the mobile station. Using the down-loading program, the

program can be changed even after the mobile station is fully assembled.

SRAM is used to store the internal flag information, call processing data, and timer data.

For key recognition, key matrix is setup using key sense0-4 signals and GPIO0-4 of output ports of MSM.

Backlight circuitry are included in the keypad for easy operation in the dark.

LCD module contains a controller which will display the information onto the LCD by 8-bit data from the

MSM.

It has a black and white full graphic 112(W) ¥ ¹

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