LP5562 - Getting a single blink in pwm control

user4171496

Other Parts Discussed in Thread: LP5562, LP5562EVM

Hi,

I'm trying to make the LP5562 light constantly using the example given in the datasheet (section 7.3.2).

The driver is connected properly to a microcontroller and the i2c communication flow look exactly as in section 7.5.2.8 (using scope).

The problem is that i'm getting a single blink from the chosen led and that's it, it's dead after this one blink. The communication is working because I can select the color I want.

When i'm restrating the microcontroller or writing the command sequence to the driver again im getting the same blink.

What am I missing?

Thanks

over 9 years ago

0 Hak-Leong Ng over 9 years ago

TI__Intellectual 1985 points

Hi,

If the hardware is working (sufficient current/voltage etc), I can't think of a good reason why it will only blink once...maybe you can also probe on Vdd and see if it dips when LED lights up.

Another thing you can do is read out the registers from 00H to 0FH and 70H and see if they are correct. I try out the same code on LP5562EVM and it works fine.

Regards

H L

0 user4171496 over 9 years ago in reply to Hak-Leong Ng

Prodigy 90 points

Thanks, I'll try.

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LP5562 - Getting a single blink in pwm control