AnsweredAssumed Answered

LEDx output signal for PCA9955

Question asked by T Y on Mar 11, 2020
Latest reply on Mar 13, 2020 by T Y

Hi All,

 

I control LED driver (PCA9955B) using i.MX RT1064. After I set each register and LED1 pin is output. However waveform from LED1 pin is negative voltage(-0.24V). The power supply of PCA9955B is 3.3V. What are the possible causes of this phenomenon? It is unknown whether software or hardware.

 

<PCA9955B data sheet>

https://www.nxp.com/docs/en/data-sheet/PCA9955B.pdf 

Attachments

Outcomes