LP5521: RGB LED dimming application by an ambitious nerd

Thomas BCG

Part Number: LP5521
Other Parts Discussed in Thread: LP5810, LP5562

Tool/software:

Hello everyone,
Thank you for your time.

I'm the co-founder of a startup where we create LoRa communication boxes for SAR missing person services.

I've recently started designing a small board based on what already exists (for example the RAK 14001 board, which uses an I2C line to drive RGB LEDs).
However, after several hours of research and reading the technical documentation for the LP5521TMX/NOPB I'm using, I'm not sure about my I2C SDA/SCL schematic.

If any of you would be so kind as to check out what I've done, I'd be grateful.
Once again, I'm not an EE but a big fan of electronic and I'll do my best! :D

My microcontroller's power supply is a RAK 4631 in 3.3V.

Thanks , Thomas

11 months ago

0 Jared Zhou 11 months ago

TI__Mastermind 20515 points

Hi Thomas,

Our expert is OoO and he will reply to you once he is back to office, thanks for your patience.

BR, Jared

0 Jared Zhou 11 months ago in reply to Jared Zhou

TI__Mastermind 20515 points

Hi Thomas,

Sorry for the late response due to the China National Day.

Can you please show me your whole schematic? Please send me email (jared-zhou@ti.com) if you don't want to attach it on public forum. Based on your attached figure, can you please tell me what's use of this structure?

Btw, I'd like to recommend our new device LP5811, the next generation for LP5521.

BR, Jared

0 Thomas BCG 11 months ago in reply to Jared Zhou

Prodigy 20 points

Hi Jared,

Thanks for your answer.

I use two 2N7002K because my output voltage from my microcontroller ( RAK 4631 ) is 3.3V.
I supply the LP 5521 with 5V, and it seems to me that it was not recommended to “mix” these two voltages... maybe I'm going the wrong way, don't hesitate to correct me.

In the meantime, I've replaced the 5521 with a 5562, which is easier to understand and apply.

Thomas

0 Jared Zhou 11 months ago in reply to Thomas BCG

TI__Mastermind 20515 points

Hi Thomas,

Actually, we also have a new device LP5810, next-gen of LP5562.

Do you still have any problems new using LP5562?

BR, Jared

0 Thomas BCG 11 months ago in reply to Jared Zhou

Prodigy 20 points

Thanks Jared !

I don't have a problem because I haven't made the circuit yet, I was just asking for an opinion :)

+1 Jared Zhou 11 months ago in reply to Thomas BCG

TI__Mastermind 20515 points

Hi Thomas,

Hope you are doing well!

Please free to contact me via email (jared-zhou@ti.com) if you have any questions.

BR, Jared

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LP5521: RGB LED dimming application by an ambitious nerd