Nokia RM-497 Service Manual page 132

RM-497
System Module
The LOVIISA PMU will generate an interrupt signal to the JUNO BB ASIC (D2810) to alert it of a change in the
charger status. The JUNO BB ASIC will then read the PMU interrupt register through the Broadcom Serial Control
(BSC, I2C-compatible) interface to determine the charger status.
R2202 is the current sense resistor for both wall & USB chargers.
Figure 36 Electrical interface between charger and PMU and baseband
Wall Charger
The Wall charger input provides a voltage supply that is higher than 3.9V to the VCHGR input on the LOVIISA
PMU (N2201).
The Wall charger will start in trickle mode with 90 mA charging current when the battery voltage is less than
2.9V. When the battery voltage is equal to or high than 2.9V, it will allow up to 1.0 A of charging current.
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