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LP3950 LED Driver

Leonhard Eberts
Prodigy 90 points
Other Parts Discussed in Thread: LP3950, LP5523

I have found  LP3950  LED Driver. This can be done by 1pin-Connect function in Default Mode with Audio Synchronization. But It is not clear, which are default values ​​used in the default mode. In Table 9, it is not apparent.
Is it possible at the LP3950 permanently save commands even after power off und power On?
What values ​​AGC gain, SPEED, MODE_CTRL be used in audio sync default mode?
 Are there any other audio sync IC with 1 adjustable PIN Default Mode available from TI ?
Can  LP3950  be operated without BOST modules like? With +5 V or +12 V
Where can I find FotPrint Library for EAGLE 6.0 or ORCAD of LP3950?

Is there an easy cheap controller where of a button can send I2C commands to the LP3950.
Is there any way as 8 different colors with the LP3950 to shew, and with fading effect simultaneously. I mean that when you turn off and On the led slowly 10 - to 50 sec  go from 0% to 100% light intensity.

Thank you (Sorry for Google translate)

  • 0
    TI__Intellectual 2510 points

    Leonhard,

    Sorry for the slow response to this.

    In the Table 9, there are default bits shown below each bit name. So for example EN_AGC = 1 by default and EN_SYNC = 0 by default.

    When using the default mode the EN_SYNC bit is forced to '1'. GAIN_SEL  = 101, MODE_CTRL = 01, SPEED_CTRL=01. The default mode is controlled with the AMODE pin.

    It is not possible to permanently save commands. The registers will be set to default value after power off - power on cycle.

    Setting DME pin to '1' starts up the boost and therefore I would recommend you to use this with the boost components.

    For the controller side I cannot give any recommendations.

    If you are looking for more complex fading/LED control programmability you might want to take a look on the LP5523.

    Hope these answers at least some of your questions.

    Regards,

    Sami