LP3913 Datasheet, PDF (46/70 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players

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.
IRQB
IMR
IRQ
int0
int1
int2
int3
Interrupt
sources
CHG_IN power
detected
CHG_IN power
removed
USB Power
detected
USB Power
removed
int4
Battery Low
int5
Thermal alarm
int6
int7
Interrupt
Pending
register
ADC conversion completed
Charger
safety timer
timeout
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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