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LG-MC2670
2.3.4 Power Supply Part
Turn ON
When the battery voltage (4.2V ~ 3.3V) is fed and the PWR key of keypad is pressed, PMIC is
activated by the ON_SW signal, and then the control signal ON_SW_S/ signal is generated. And then,
the regurator 2.4V_MSMC & 2.8V_MSMP, 2.6V_MSMA, are operated.
Operating
During the phone is on operating state,
LDO(in PMIC) for MSM is always enable and gives the power MSM6000 and memory part
LDO(in PMIC) for +2.6V_TX part is enabled on IDLE/ state, and gives the power TX part devices.
LDO(in PMIC) for +2.6V_RX part is enabled on SLEEP/ state, and gives the power RX part devices.
Turn OFF
When the PWR key is pressed during a few seconds, PMIC is turned on by ON_SW and then, 'Low' is
outputted on ON_SW_S/. MSM6000 receives this signal and then, recognizes that the POWER key
has been pressed. During this time, MSM6000 outputs PS_HOLD as low and turn off all devices
[Figure 1-2] Block Diagram Of Power Management IC
2.3.5 Logic Part
The Logic part consists of internal CPU of MSM6000, PSEUDO RAM & FLASH MEMORY.
The MSM6000 receives TCXO/4 clock(19.20Mz) and CHIPX8 clock signals, and then controls the
phone during the CDMA and the FM mode. The major components are as follows:
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