Datasheet

Data Sheet ADP8866
Rev. A | Page 19 of 52
INTERRUPTS
There are four interrupt sources available on the ADP8866.
 Independent sink off: when all independent sinks that are
assigned with the DxOFFINT bits high in Register 0x04
and Register 0x05 have faded to off, this interrupt
(ISCOFF_INT, Register 0x02) is set.
 Backlight off: at the end of each automated backlight fade-
out, this interrupt (BLOFF_INT, Register 0x02) is set.
 Overvoltage protection: OVP_INT (see Register 0x02) is
generated when the output voltage exceeds 5.7 V (typical).
 Thermal shutdown circuit: an interrupt (TSD_INT,
Register 0x02) is generated when entering
overtemperature protection.
 Short-circuit detection: SHORT_INT (see Register 0x02) is
generated when the device enters short-circuit protection
mode.
The interrupt (if any) that appears on the nINT pin is
determined by the bits mapped in Register INT_EN, 0x03. To
clear an interrupt, write a 1 to the interrupt in the INT_STAT
register, 0x02, or reset the part.
BACKLIGHT OFF INTERRUPT
The backlight off interrupt (BLOFF_INT) is set when the
backlight completes a fade-out. This feature is useful to
synchronize the backlight turn off with the LCD display driver.
BL_EN = 1 BL_EN = 0
BLOFF_INT SET
BACKLIGHT CURRENT
MAX
FADE-IN
OFF-TO-MAX
FADE-OUT
MAX-TO-OFF
09478-038
Figure 37. Backlight Off Interrupt Timing Diagram
INDEPENDENT SINK OFF INTERRUPT
The independent sink off interrupt (ISCOFF_INT) is generated
when all the independent sinks assigned in Register 0x04 and
Register 0x05 have faded to off. This can happen during a
blinking profile (where SCxOFF does not equal disabled) or
when an ISC is disabled. Note that even with fade-out set to 0,
an ISCOFF_INT is still set.
SCx_EN = 1
SCxOFF
ISCOFF_INT SETISCOFF_INT SET
ISC CURRENT
FADE-IN FADE-OUT
SCON
09478-039
Figure 38. Independent Sink Off Interrupt Timing Diagram