Is the pin HIGH-Z status while IMX6D power off?

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Is the pin HIGH-Z status while IMX6D power off?

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Contributor IV

HI,

My board has IMX6D and st-MCU,sometimes to reduce power consumption of board,the MCU can power off the IMX6D,but,when power off IMX6D,the current of board is 12V@0.05A,I found that while I depopulate R1214, it change to 12V@0.01A,why? In my opinion,while power off the IMX6D,the pin of IMX6D is hi-Z states,why the TXD pin  still consume current?  and what about other IOs,for example,IIC,GPIO,UART,CAN  and so on.

R1214 connect to CPU UART    PIN=E24,UART2_TXD(EIM_D26).

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NXP TechSupport
NXP TechSupport

> Please show me the IMX6 datasheet,I like to read chapter of Power Supplies Usage section.
> If I change the R1214 from 0R to 1K,it turn to 0.01A 12V.So,is it a good way to solve this problem?

pastedImage_1.png

Changing R1214 decrease leakage, but strictly speaking, a switch instead of R1214 should be applied.

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NXP TechSupport
NXP TechSupport

> Please show me the IMX6 datasheet,I like to read chapter of Power Supplies Usage section.
> If I change the R1214 from 0R to 1K,it turn to 0.01A 12V.So,is it a good way to solve this problem?

pastedImage_1.png

Changing R1214 decrease leakage, but strictly speaking, a switch instead of R1214 should be applied.

View solution in original post

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Contributor IV

thanks.

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NXP TechSupport
NXP TechSupport

Hello,

 

  The i.MX6 Datasheets - in Power Supplies Usage section - provide the following requirment:

"All I/O pins must not be externally driven while the I/O power supply for the pin (NVCC_xxx) is OFF.

This can cause internal latch-up and malfunctions due to reverse current flows".

  This means, that i.MX6 cannot be considered as HIGH-Z, when the device is powered off.

 

Have a great day,

Yuri

 

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