SNVSBY7 March 2021 TPS92390
During normal boost operation, boost voltage is raised if any of the used LED outputs falls below the LED_DRV_HEADROOM threshold level. Open LED fault is detected if boost output voltage has reached the maximum and at least one LED output is still below the threshold. The open string is then disconnected from the boost adaptive control loop and its output is disabled. Any LED fault sets the status bit LED_STATUS and an interrupt is generated unless LED interrupt is disabled. The detail of open LED faults can be read from bits OPEN_LED and LEDx_FAULT (x = 1...4). These bits maintain their value until device power-down. But the LED_STATUS bit could be cleared by the interrupt clearing procedure. If a new LED fault is detected, LED_STATUS is set and an interrupt generated again.