By ams 30
The ams AS3665 is a capacitive low noise charge pump with 9 current sources. The charge pump automatically switches between 1:1 and 1:1.5 modes. The connected current sources have a very low voltage compliance to improve the efficiency of the entire system. Three current sources have the possibility to operate either from VBAT or VCP (especially useful for red LEDs).
The internal control is done by command based pattern generators implemented by three sequencers. These commands are optimized for lighting applications (e.g. to ramp up brightness logarithmically). It includes high level commands including conditionals, jumps, and variables.
Any of the three sequencers can be dynamically mapped to any of the nine PWM generators for the LEDs. The AS3665 supports an audio input and sophisticated light patterns can be controlled by internal digital filters.
The AS3665 is controlled by I2C mode. Synchronization over several AS3665 devices is possible via the TRIG pin. The AS3665 is available in a space-saving WL-CSP-25 (2.5 mm x 2.5 mm) 0.5 mm pitch and operates over the -30°C to +85°C temperature range.
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