The charge pump provides backlight current in conjunction with four matched current sinks. It also can supply continuous or bursted current to a flash LED using the dedicated flash driver current sink. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. An optional fading feature that gradually adjusts the backlight current is provided to simplify control software. A flash-timeout feature disables the flash if active for longer than 1 second. The SC621 also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits. The SC621 uses the proprietary SemWireTM single wire interface. The interface controls all functions of the device, including backlight and flash currents as well as two LDO voltage outputs. The single wire implementation minimizes microcontroller and interface pin counts. The flash/spotlight output is triggered via either the SemWire interface or a dedicated pin.