LP3913 Datasheet, PDF (45/70 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players

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Start
CPU sends start
conversion command
to ADC
Select adc source
ADC executes
conversion request
LP3913
SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013
I2C
transfers
start cid reg
data stop
Conversion done
pulls down IRQB
line
System CPU
services IRQ
CPU reads data
start cid reg start Cid/R reg stop
CPU
sends next
Y
start conversion
command
?
N
End
start cid reg data stop
Interrupt Request Output
The LP3913 has the ability to interrupt the system processor through the open drain IRQB pin, which transitions
to an active logic low level upon the following 8 events:
• USB Power detected
• USB disconnected
• CHG_IN Power detected
• CHG_IN Disconnected
• Battery low alarm
• Thermal Alarm
• ADC conversion completed
• Charger safety timer time-out
The events form the interrupt sources that correspond to a certain bit location in the Interrupt Request (IRQ)
Register. All interrupt sources can be masked by the Interrupt Mask Register (IMR). Masking the interrupt
prevents the interrupt event from asserting the IRQB pin, yet the event will still be captured in the IRQ register,
which allows the processor to poll the interrupt sources.
After an active low IRQB has been detected by the system processor, the latter services the interrupt and will
access the IRQ register to determine which source was responsible for the interrupt request. Reading the IRQ
register will automatically clear the register to enable the capture of the next interrupt events.
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