AP2061AEC Datasheet, PDF (14/29 Pages) Asahi Kasei Microsystems – 2.0A High-side LED Driver for Camera Flash with I2C

[AP2061AEC]
5) OFF → Torch → Flash → Torch → OFF (EDGE Control)
Power Supply
LED1,LED2
Setting
Resister
Setting
TORCH pin
or TORCH bit
STROBE pin
or FLASH bit
Internal Timer
LED
Current
(1)
(2)
Setting
(3)
Setting timer
(5)
(8) Reset ₍₅₎
Setting timer
(8) Reset
(6)
(4)
(7)
(6)
(7)
Figure 8. Torching to Flashing Sequence (EDGE Control)
(1) To reset the internal circuits of the AP2601, wait 5ms after power is supplied (VIN ≥ 2.7V) to the
AP2601 and set LED2-1 bits = “01”, “10” or “11”. The AP2061 is powered up by setting LED1 and
LED2 bits.
(2) After LED1 and LED2 bits are set, the VOUT pin voltage changes to VIN*95% within 5ms with inrush
current < 500mA.
(3) Set the TORCH pin= “H” or TORCH bit= “1” after register settings are finished.
Wait 5ms and set the TORCH pin = “H” or TORCH bit = “1” after setting LED2-1 bits.
(4) LED current will reach the setting current within 300s after setting the TORCH pin= “L” to “H” or
TORCH bit= “0” to “1”.
(5) The internal timer will start after setting the STROBE pin= “L” to “H” or FLASH bit= “0” to “1”.
(6) LED current will reach the setting current within 500s after setting the STROBE pin= “L” to “H” or
FLASH bit= “0” to “1”.
(7) LED current will change to 0mA immediately after the timer is finished even if the STROBE pin= “H”
or FLASH bit= “1”.
(8) When the internal timer is finished, it will be reset automatically.
MS1603-E-00
- 14 -
2014/01