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Chapter 3.
Circuit Description
3-1. Controller ( LOGIC PART )
1. Oper ation scheme
After applying the Battery power (+3.5-4.2V), push the END KEY (POWER KEY), As the high stage
is applied to the PWRKEY PIN of AN32201A (IC404), It makes the internal power supply turns on,
the power which is generated by the internal Power supply turns on, apply to the MSM6100 CORE
(1.867V), MSM6100 PAD and Memory (SDRAM, NAND FLASH). After 170 ~ 200ms, It is the time
when the each of the power source was stable, the RESET signal release from Low to High and
the operation is started. In the first step, the PS_HOLD signal on HIGH state driven the MSM6100
is inputted to the AN32201A and AN32200A. So, the AN32201A and AN32200A can keep stable
power level regardless of the PWR_KEY_SENSE signal. The AN32201A supply with the MSM6100,
SDRAM, NAND Flash and YMU765. The AN32200A supply the RF part needed air interface such
as VTX, VRX, VPLL and VTCXO. A separated LDO supply the KEYPAD backlight LED and CALL
LED.
One LDO is used to operate the main LCD on flip board. Two LDOs supply power to VGA camera
and One LDO keeps power to operate oscillator, which needs to operate the camera. In addition,
One DC-DC converter supply backlight power of the main and sub LCD.
2 . MOBILE STATI ON MODEM IC
The MSM6100 device contains an embedded ARM926EJ-S Microprocessor, which can operate
at 146MHz as the maximum frequency and integrates java hardware acceleration for faster Java-
based games and other applets. And it adopts a wideband audio CODEC and Bluetooth
baseband processor. Camera interface block allows MSM6100 to connect to the external camera
without any external logic. Also, the MSM6100 integrates Vocoder, which supports EVRC,
ACELP13K and Tri-Mode (CDMA cellular, CDMA PCS, AMPS cellular) operations. The MSM6100
solution adopts two low-power, high performance QDSP4000 digital signal processor cores. By
using of the ARM926EJ-S CPU and QDSP4000 DSP, it can eliminate the needs of the multimedia
companion processor(s), which is normally required for video-based applications, playing MP3
music files and MIDI synthesizer/CMS function. The MSM6100 chipset supports the interface for
next-generation memories architectures, such as ; NAND FLASH, PSRAM, Page and Burst mode
NOR FLASH and low power SDRAM. Others interfaces to peripherals is described in the chapter
6
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