IS MY IMX6 THE uart1_rx PIN WAS BURNED?

[zhanghan]

hello，I use the uart1_rx and uart1_tx pin of  imx6q  to be TTL debug ,now i don't know why when i connect this debug interface by  TTL -USB  line to pc secure CRT,I can not send anyting to my board but i can receive the message from my board  ,then i measure the level of my UART1_RX PIN is 0V,and the uart1_tx pin is still 3.3v,so is my imx6 was burned?why cause this thing happen? is somebody connect wrong the three lines when he or she debugs?can somebody smart answer me timely,very thanks!

[igorpadykov]

Hi zhang

please check voltage on "TTL -USB  line to pc" when it is not connected to UART1_RX .

It should not exceed power for CSI0_DAT11, that is NVCC_CSI. Otherwise additional

level (voltage) shifter is needed.

Best regards
igor
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[zhanghan]

I. Have check it when not connected. The voltage on tx and rx pin on USB to ttl line all is 3.3V .is my imx6 was. Burned ？should I change it with another new chip ？

[igorpadykov]

what is NVCC_CSI value ?

Had you connected " USB to ttl" to unpowered i.MX6Q, this may destroy processor.

~igor

[zhanghan]

MY NVCC_CSI IS 3.3V, my colleague ever connect a 5V output USB TO ttl line to my board ，does it may destory processor？