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IN
I
2
C command
t
wait
≥2ms
HWEN
Fig 46 Power-Up Sequence with HWEN Driven by GPIO
FLASH MODE
In Flash Mode, the LED current sources (LED1/2) provide 128 target current levels from 11.35mA to 1.5A.
The total allowed LED current during operation is 1.5A (I
LED1
+I
LED2
≤1.5A). The Flash currents are
adjusted via the LED1 and LED2 Flash Brightness Registers. Flash mode is activated by the Enable
Register(setting M1, M0 to '11'), or by pulling the STROBE pin HIGH when the pin is enabled (Enable
Register). Once the Flash sequence is activated the current source (LED1/2) ramps up to the programmed
Flash current by stepping through all current steps until the programmed current is reached.
When the device is enabled in Flash Mode through the Enable Register, all mode bits in the Enable Register
are cleared after a flash timeout event.
TORCH MODE
In Torch mode, the LED current sources (LED1/2) provide 128 target current levels from 2.55mA to 372mA.
The Torch currents are adjusted via the LED1 and LED2 Torch Brightness Registers. Torch mode is activated
by the Enable Register (setting M1, M0 to '10'), or by pulling the TORCH/TEMP pin HIGH when the pin is
enabled (Enable Register) and set to Torch Mode. Once the TORCH sequence is activated the active current
sources (LED1/2) ramps up to the programmed Torch current by stepping through all current steps until the
programmed current is reached. The rate at which the current ramps is determined by the value chosen in the
Timing Register.
Torch Mode is not affected by Flash Timeout or by a TX Interrupt event.
IR MODE
In IR Mode, the target LED current is equal to the value stored in the LED1/2 Flash Brightness Registers.
When IR mode is enabled (setting M1, M0 to '01'), the boost converter turns on and set the output equal to the
input (pass-mode). At this point, toggling the STROBE pin enables and disables the LED1/2 current sources
(if enabled). The strobe pin can only be set to be Level sensitive, meaning all timing of the IR pulse is
externally controlled. In IR Mode, the current sources do not ramp the LED outputs to the target. The current
transitions immediately from off to on and then on to off.
