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ADC executes

conversion request

System CPU

services IRQ

CPU reads data

Start

cid

reg

data

start

stop

cid

reg

data

start

stop

Select adc source

End

CPU

sends next

start conversion

command

cid

reg

Cid/R

start

stop

start

reg

I2C

transfers

CPU sends start

conversion command

to ADC

Conversion done

pulls down IRQB

line

LP3910

SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015

www.ti.com

Figure 60. Data Measurement and Acquisition Sequence

8.3.6 Interrupt Request Output

The LP3910 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)

the interrupt event from asserting the IRQB pin, yet the event is still 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

accesses the IRQ register to determine which source was responsible for the interrupt request. Reading the IRQ

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