LP3913 datasheet(46/70 Pages) TI1

46 / 70 page

CHG_IN power

detected

USB Power

detected

USB Power

removed

Battery Low

Thermal alarm

ADC conversion completed

IMR

IRQ

IRQB

Interrupt

sources

Charger

safety timer

timeout

Interrupt

Pending

int1

int2

int3

int4

int5

int6

int7

int0

CHG_IN power

removed

LP3913

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

www.ti.com

As new interrupts can occur while the I2C read cycle is clearing the IRQ register, a buffer register called Interrupt

Pending Register (IPR), not accessible through the I2C compatible interface holds the next interrupts. De-

asserting the IRQB output is immediately followed by a new transition of IRQB to logic low when an interrupt is

pending.

The Interrupts are not hardware prioritized. It is up to the firmware to determine the priority in case more than

one Interrupt Request is set.

Interrupts and Standby Mode

Interrupts are captured in standby mode and can be serviced when the system processor is enabled when the

LP3913 is in an active state.

Interrupt Sources

CHG_IN Power Detected and CHG_IN Disconnect (INT0 and INT1) An interrupt (INT0) is generated when

CHG_IN power is connected to the LP3913. Another interrupt (INT1) will be generated upon CHG_IN power

removal.

USB Power Detected and USB Disconnect (INT2 and INT3) An interrupt (INT2) is generated when USB power

is connected to the LP3913. Another interrupt (INT3) will be generated upon disconnecting the USB power.

Battery Low (INT4) When the battery voltage drops below the battery low threshold IRQ, an interrupt will be

generated. This allows the processor to perform some housekeeping tasks prior to going to standby mode.

Thermal Alarm (INT5)If the Junction Temperature of the LP3913 exceeds 115°C, then an interrupt will be

generated

ADC Conversion Done (INT6)The ADC generates an interrupt request upon the completion of a data

conversion.

Charger Timer Interrupt (INT7) A charger timeout will occur 10 hours after it started (see Li-Ion Linear Charger)

and will subsequently request an interrupt.

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