8.4.2 Active Mode

In active mode the backlight is enabled either with setting the ON register bit high (BRTMODE = 0 1, 10, 11) or by activating PWM input (BRTMODE=00). The powers supplying the VDD and EN/VDDIO pins must be present. Brightness is controlled with I²C writes to brightness registers or by changing PWM input duty cycle (operation without I²C control). Configuration registers are not accessible in Active mode to prevent damage to the device by accidental writes. Current consumption from VDD pin this mode is typically 2.2 mA when boost is enabled and LEDs are not drawing any current.