LG KF690, Руководство по обслуживанию

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3. TECHNICAL BRIEF
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3.7 Power Block
3.7.1 General
ESM6270, included RF, is fully covered by PM6635(Qualcomm PMIC). PM6635 cover the power of
ESM6270, memory, RF block, Bluetooth, USIM and TCXO.
Major power components are :
PM6635 : Phone power supply
MV9319 : LCD Backlight/Flash charge pump
3.7.2 PM6635
As shown in [Fig. 3.9], the PM6635 device integrates all wireless handset power management. The
power management portion accepts power from all the most common sources - battery, external
charger, adapter, coin cell back-up - and generates all the regulated voltages needed to power the
appropriate handset electronics. It monitors and controls the power sources, detecting which sources
are applied, verifying that they are within acceptable operational limits, and coordinates battery and
coin cell recharging while maintaining the handset electronics supply voltages. Eight programmable
output voltages are generated using low dropout voltage regulators, all derived from a common
trimmed voltage reference.
A dedicated controller manages the TCXO warm-up and signal buffering, and key parameters
(undervoltage lockout and crystal oscillator signal presence) are monitored to protect against
detrimental conditions. ESM6270 device controls and statuses the PM6635 IC using Single Serial Bus
Interface (SSBI)supplemented by an Interrupt Manager for time-critical information. Another dedicated
IC Interface circuit monitors multiple trigger events and controls the power-on sequence.
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