LG -T370 Service Manual page 23

The ADC and the oscillator for the ADC needs the VDD_ADC supply voltage from the LADC LDO. LADC uses
The ADC and the oscillator for the ADC needs the VDD_ADC supply voltage from the LADC LDO. LADC uses
either the charger voltage VDD_CHARGE or VDDRTC as input voltage. The input voltage is selected
either the charger voltage VDD_CHARGE or VDDRTC as input voltage. The input voltage is selected
automatically by a bulk switch circuit. LADC, the ADC and the oscillator are enabled on request for every battery automatically by a bulk switch circuit. LADC, the ADC and the oscillator are enabled on request for every battery
measurement if the charger unit is not running. This is handled by an ADC control block in one of the state-
measurement if the charger unit is not running. This is handled by an ADC control block in one of the state-
machines. If the charger unit is running the ADC is controlled by the charger state-machine
machines. If the charger unit is running the ADC is controlled by the charger state-machine
SYSTEM_OFF
VBAT < SYSOFF
Figure.3.2.1 First Part of the State Machine, Running in Different Power Domains than the Second Part
Figure.3.3.2 First Part of the State Machine, Running in Di erent Power Domains than the Second Part
Figure.3.2.2 First Part of the State Machine, Running in Dierent Power Domains than the Second Part
LGE Internal Use Only
BAT low
all LDO's o
PMU lpmu_pd=0
VBAT < 2.5V-e
LPBG on
BAT OK
LRTC on
oscillator on
LPMU-ULPM path on
50kHz OSC setting
wait for oscillator o.k.
PMU SM1 ON
start PMU SM1
release reset of PMU SM1
PMU SM1 SYSOFF
3. TECHNICAL BRIEF
VBAT > 2.5V
VBAT > 2.5V
VPMU o.k.
VBAT > 2.5V
LPMU o.k.
Oscillator o.k.
VBAT > 2.5V
LPMU o.k.
Oscillator o.k.
ON key event
RTC alarm
charger delect
rst_connect
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3. TECHNICAL BRIEF
Only for training and service purposes