LG -T370 Service Manual page 30

3.2.9 Undervoltage Shutdown
In active mode the PMU periodically measures the battery voltage using the ADC from the charger unit. If the
battery is measured to be below the programmable shut-down level (called SYSOFF), the system changes to b i d b b l
OFF mode. This is done via the SHUTDOWN state of the PMU state machine. (see chapter switch OFF)
3.2.10 Software Reset
A software reset does not affect any PMU register. The PMU register are reset with the reset_pmufsm_n_o A f d
signal. That means all PMU register are reset in OFF state. For details about the SW reset see chapter External
Reset Handling
LGE Internal Use Only
rf_sysclk_en_pmu
VPMU
vcxo_enable
VDDCORE
Figure 3.4.2 How sysclock Enable is Routed in the PMU Figure 3 4 2 How sysclock Enable is Routed in the PMU
h bl
ff PMU i Th PMU
L
S
Isolation to 1
& LS
L
S
to the RF macro via the
core domain in reset
h d l l ( ll d SYSOFF) h
i
- 30 - Copyright © 01 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
h
i h h f
Only for training and service purposes