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LP5024: LED not turning ON but I2C slave read/write is successful.

user6023027
Prodigy 80 points
Part Number: LP5024

Hi

I have rig up LP5024 circuit with two LEDs (Green to OUT0 and RED to OUT1). I reffered the reference design from TI.

Device VCC is 3.3V. I am using external I2C master controller (AADVARK tool) to do basic read/write operation. I am successfully able to read all register reset values and also change the register value as per the datasheet.

I just write DEVICE_CONFIG0 register to 40h to enable the chip. But i donot see the LEDs turned ON.

I checked the anode = 3.3V, Cathode= 1.7V (Green) and 2.7V (red).  Iam not sure what is missing. I should be easily control led . Let me know if anything missing.

Thanks

Eshak

  • 0
    TI__Genius 11836 points

    Hi,

       Maybe you should check the value of bit LED_Global_off. Besides, you should configure the registers of LEDx_Brightness and outx_Color for independent control of each channel. If you use bank control, don't forget to configure the registers of Bank_Brightness and Bank_x_Color.

  • 0 in reply to Charles-Chen
    Prodigy 80 points

    Hi Charles

    All the registers are set to reset values, so LED_GLOBAL_OFF bit is 0.

    In reset value , it is configured as independent control and so LEDX_Brightness is set to 100% and outx_color as 100%.

    But I see Viref= 0V, Vcap =1.7V

    Please clarify, whether we need to follow any procedure to turn on LED.

    Thanks

    -Eshak

  • 0 in reply to user6023027
    TI__Genius 11836 points

    Hi,

      Please note that the reset value of outx_Color is 00h, so you need to configure it to turn on the LED. You need to check corresponding registers mentioned in my previous answer carefully.