The smart current sink LED backlight from Semtech features on-chip digital lighting effects for high-end handheld displays. This platform incorporates the smart Automatic Dropout Prevention technology to enable a new-generation of current sink drivers that can replace boost converters and charge pumps in high-end handhelds while providing display backlighting. On-chip digital lighting effects provide flexibility to incorporate fade, breathe and blink effects without changing the firmware. The SC667 and SC668 are current sinks to incorporate ADP technology and integrate a number of functions to enable an ambient light sensing or control circuit that sets backlight brightness based on surrounding lighting conditions. A PWM dimming interface that incorporates a digital low-pass filter is also included, providing the capability to perform content-adaptive brightness control. The SC668 provides eight current sinks, while the SC667 features seven, plus an interrupt request indicator signal to tell the host processor when an ambient light threshold has been crossed. Both devices have an on-chip digital lighting-effects engine to control LED fade-in/fade-out, breathe, blink, auto-dim full, and auto-dim partial; an I2C interface to program and control the LEDs; and four programmable, 200mA low-noise LDO regulators for multiple embedded peripherals.
0 komentar:
Posting Komentar