LP5018: use iic init LP5018success，but LP5018 output pin not pwm signal output

wq liu

Prodigy 20 points

Part Number: LP5018

hi：

i use single lp5018，and set device address 0x28，i use iic to initial the lp5018，config regist as follow：

DEVICE_CONFIG0 reg = 0x40，
DEVICE_CONFIG1 reg = 0x3f，

LED_CONFIG0 = 0，

and i set LED0 brightness = 0xff,

lLED0 OUT0_COLOR = 0xaa,

lLED0 OUT1_COLOR = 0xff,

lLED0 OUT2_COLOR = 0xcc,

i am sure i write all data success to lp5018,but i can ont capture pwn signal from out0color pin 、out1color pin and out2color pin

how can i solve this problem。

I capture iic signal as follow：

over 3 years ago

0 Monet Xu over 3 years ago

TI__Expert 6675 points

Hi, wq,

There is a small mistake in your code. You should't set the DEVICE_CONFIG1 reg to 3Fh. The DEVICE CONFIG1 register field descriptions is shown in figure 22 and table 7 of its datasheet. The lowest bit(set to 1) of this register shut down all LEDs.

Best Regards.

Monet Xu

0 wq liu over 3 years ago in reply to Monet Xu

Prodigy 20 points

hi，Monet Xu：

Thank you for your answer.

sorry,i describ eerror，i set DEVICE_CONFIG1 reg to 0x3c,i capture my initialization data as follow：

but i still cant not capture any pwm in out0_color pin.

Best Regards.

0 Monet Xu over 3 years ago in reply to wq liu

TI__Expert 6675 points

Hi, wq,

I have some questions:

1.Could you tell me where did you get the waveform?

2.why there is a peak between the slave address and register address?

thanks!

Best Regards.

Monet Xu

0 Monet Xu over 3 years ago in reply to wq liu

TI__Expert 6675 points

Hi, wq,

If you still have problem, please feel free to let me know.

Best Regards.

Monet Xu

Power management

Power management forum

LP5018: use iic init LP5018success，but LP5018 output pin not pwm signal output