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AS3668 Datasheet(PDF) 1 Page - ams AG |
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AS3668 Datasheet(HTML) 1 Page - ams AG |
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1 / 59 page  AS3668 4 Channel Breathlight Controller www.ams.com/AS3668 Revision 1.13 1 - 59 Data Sheet 1 General Description The AS3668 is a 4-channel LED driver designed to produce lighting effects for portable devices. A highly efficient charge pump enables LED driving over full Li-Ion battery voltage range. The device is equipped with an internal program memory, which allows control of LED patterns even without processor control. This helps the whole system to save power and extend for example battery life time in every mobile application. The AS3668 maintains excellent efficiency over a wide operating range by automatically selecting the best charge pump gain based on the LED forward voltage requirements and the device input voltage. Furthermore the chip supports an automatic power-save mode which gets active when LED outputs are not active. The special power- save mode has a extremely low current consumption below 10μA (typ.).the AS3668 has an I2C-compatible control interface which supports two slave address without having a dedicated address selection pin. For fancy lighting effects synchronized with an audio signal the device supports special digital filter modes in order to make music literally visible on the 4 independent configurable current sources. The AS3668 is available in a very tiny 12-pin WL-CSP (1.255x1.680mm) 0.4mm pitch package. Figure 1. AS3668 Block Diagram 2 Key Features High efficiency capacitive 60mA charge pump with 1:1 and 1:2 mode Automatic mode switching for charge pump Automatic Pattern Mode without digital control Highly accurate 4 Channel High Side 25.5mA current sources Audio Controlled Lighting with internal digital filters Charge Pump with soft start and overcurrent/short circuit pro- tection Integrated “easy to use” pattern generator for breathlight LED function with logarithmic 12bit dimming Small application circuit Minimum number of external components Available in 12-pin WL-CSP (1.255x1.680mm) with 0.4mm pitch 3 Applications The product is perfect for Mobilephones, MP3 Player, Portable Navigation Devices, Digital Cameras, USB Dongles/Modems, Game Controllers and can be used for fun and indicator lights, backlighting and as programmable current sources. |
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