LG G7100 Service Manual page 27

E. Key interface
Include 5 column and 5 row. The AD6522 detect key press by interrupt.
F. ADP3522 interrupt
There are two interrupts, EOC and CHRDET
EOC: End of Charge. AD6525 makes charging operation stop when high signal is inputted.
CHRDET: This pin is activated when the charger is inserted.
Figure 3-8. SIM Interface of AD6525
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3. TECHNICAL BRIEF