LP3910SQ-AN Datasheet, PDF (44/60 Pages) National Semiconductor (TI) – Power Management IC for Hard Drive Based Portable Media Players

The Interrupts are not hardware prioritized. It is up to the
firmware to determine the priority in case more than one In-
terrupt 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 LP3910SQ-
AN 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 LP3910SQ-AN. 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 LP3910SQ-AN. 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
LP3910SQ-AN exceeds 115°C, then an interrupt will be gen-
erated
30101224
ADC Conversion Done (INT6)The ADC generates an inter-
rupt 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 Charger section) and will
subsequently request an interrupt.
IMR REGISTER (0C)H INTERRUPT MASK REGISTER
D7–0
Access r/w
Data
1: Enable INTn (n=0…7) to pull IRQB low
0: Mask Interrupt source INTn
Reset 8’h00
IRQ REGISTER (0D)H INTERRUPT REQUEST REGISTER
D7–0
Access Read only
Data
1: Interrupt IRQn (n=0…7) requested
0: No interrupt requested
Reset 8’h00
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