LP5523: Is this a normal behavior for I2C on this IC? There is a spike of noise on SDA seemingly on the transition from bit 7 to 8.

Anthony Sandoval

Prodigy 10 points

Part Number: LP5523

over 2 years ago

0 Aaron Bing over 2 years ago

TI__Expert 4120 points

Hi Anthony,

Is the data transmission valid from the LP5523 slave side? Please utilize the logic analyzer for a double-check.

Best Regards,

Aaron

0 Anthony Sandoval over 2 years ago in reply to Aaron Bing

Prodigy 10 points

We have been able to read the register written to both LP5523 slaves and they both match but only the LEDs connected to the first are working as expected, the LEDs connected to the second LP5523 are not.

0 Aaron Bing over 2 years ago in reply to Anthony Sandoval

TI__Expert 4120 points

Hi Anthony,

If the correct data is read from both LP5523 slaves, I assume that the I2C communication works fine. Kindly examine the power supply and enabling sequence of that abnormal LP5523.

Best Regards,

Aaron

Power management

Power management forum

LP5523: Is this a normal behavior for I2C on this IC? There is a spike of noise on SDA seemingly on the transition from bit 7 to 8.