LP3910 datasheet(39/72 Pages) TI1

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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

LP3910

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SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015

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.

Figure 61. Interrupt Request Setting

8.3.6.1 Interrupts and Standby Mode

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

LP3910 is in an active state.

8.3.6.2 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 LP3910. Another interrupt (INT1) is 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 LP3910. Another interrupt (INT3) is generated upon disconnecting the USB power.

•

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

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

•

Thermal Alarm (INT5): If the junction temperature of the LP3910 exceeds 115°C, an interrupt is 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 occurs 10 hours after it started (see Li-Ion Linear Charger)

and subsequently requests an interrupt.

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