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BOOST-LP5569EVM: Register Configuration for turn on / off White LED & RGB LED by using other MCU

Rina Chen
Prodigy 20 points
Part Number: BOOST-LP5569EVM
Other Parts Discussed in Thread: LP5569

Hi,
Now I'm using the I2C of other MCU to connect this board,

I'm trying to do these register configuration below:

data > register

0x40 > 0x00 (CONFIG)

0x58 > 0x2F 

0xFF > 0x16

But the led on LP5569EVM didn't light up.

Could you provide me the correct register configuration? thanks you.

Best Regard,

Rina

  • +1
    TI__Expert 4160 points

    Hi Rina, 

    You could try the following register configuration: 

        Reg [0x00] = 0x40 // CONFIG

        Reg [0x22] = 0xAF // LED0 Current Default @ 17.5mA

        Reg [0x2F] = 0x59 // Internal 32kHz enabled

        Reg [0x33] = 0x02 // Headroom Default @ 250mV

        Reg [0x3C] = 0x80

        Reg [0x3D] = 0x02

        Reg [0x80] = 0x04 // PWM CONFIG

        Reg [0x16] = 0xFF // LED0 100% duty cycle

    We still recommend to evaluate LP5569 with the MSP432 connected on the official GUI platform, because you can easily program desired lighting patterns, upload them to LP5569, and debug codes based on generated register log.

    Best Regards, 

    Aaron Bing

  • 0 in reply to Aaron Bing
    Prodigy 20 points

    Hi Aaron,
    It's still not working... I'm sure that register configuration had been set successfully.
    The figure showed below is how I connect to LP5569EVM. 
    Is there anything wrong?

    Best Regards,

    Rina


  • 0 in reply to Rina Chen
    TI__Expert 4160 points

    Hi Rina, 

    The four wires connection in the figure are correct. Please verify the other connections based on the MCU you chose

    Best Regards, 

    Aaron Bing

  • 0 in reply to Aaron Bing
    Prodigy 20 points

    Hi Aaron,
    I tried to connect EN_PWM to 3.3V, CLK to 3.3V and INT is floating. But it's still not work...
    Do I have to give LP5569 CLK and INT?
    I would like to turn on LED without any lightening effect(breathing or any other effect).

    Thanks for your replying!

    Best Regards,

    Rina

  • 0 in reply to Rina Chen
    TI__Expert 4160 points

    Hi Rina, 

    No, you don't need to. I duplicate your hardware setup on MSP432P401R and everything work fine. At this point, I suggest to check software problems. The "other MCU" you used and its corresponding compiler can also be the causes of this type of problems. 

    Best Regards, 

    Aaron Bing

  • 0 in reply to Aaron Bing
    Prodigy 20 points

    Hi Aaron,

    I just reset the LP5569

    Reg [0x3F] = 0xFF // RESET

    and do the register configuration you provided me above,

    It works!!

    Thanks you very much! Slight smile

    Best Regards,

    Rina

     

  • 0 in reply to Rina Chen
    TI__Expert 4160 points

    Hi Rina, 

    No problem. I am glad it works :D

    Best Regards, 

    Aaron Bing