i.MX8Mplus NVCC sequencing

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i.MX8Mplus NVCC sequencing

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max123
Contributor I

I am a little confused about NVCC-power-sequencing and using 3.3V and 1.8V for IO.

According to IMX8MPIEC 3.2.1 (Power-up sequence) is NVCC_xxx 1.8V -> NVCC_DRAM -> NVCC_xxx 3.3V.

On a PCA9450CHN, Buck 4 (3.3V) and Buck 5 (1.8V) could therefore be used, since Buck 4 is started after NVCC_DRAM, Buck 5 before.

Why should the sequence for the same voltage change just because 1.8V is used instead of 3.3V? Therefore I think I may be missing something important.

Therefore my question:

Can Buck 4 be used to power some NVCC_xxx voltages with 3.3V, like NVCC_I2C_UART or NVCC_JTAG? Are there any drawbacks of doing so, and is it possible to use both 1.8V and 3.3V? The EVM only uses 1.8V for some reason, which is inconvenient for me in some cases.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Maximilian

 

>Can Buck 4 be used to power some NVCC_xxx voltages with 3.3V, like NVCC_I2C_UART

>or NVCC_JTAG?

 

yes as Buck 4 (3.3V) is started after NVCC_DRAM as you mentioned

 


>Are there any drawbacks of doing so, and is it possible to use both 1.8V and 3.3V?

 

no drawbacks as this complies with i.MX8M Plus power-up sequence, NVCC_xxx (1.8 V) -->

NVCC_DRAM-->NVCC_xxx (2.5 and 3.3 V).

 

> is it possible to use both 1.8V and 3.3V?

 

yes if it complies with i.MX8M Plus power-up sequence described in Figure 5. The power-up sequence

i.MX 8M Plus Applications Processor Datasheet for Consumer Products

 

Best regards
igor

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482 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Maximilian

 

>Can Buck 4 be used to power some NVCC_xxx voltages with 3.3V, like NVCC_I2C_UART

>or NVCC_JTAG?

 

yes as Buck 4 (3.3V) is started after NVCC_DRAM as you mentioned

 


>Are there any drawbacks of doing so, and is it possible to use both 1.8V and 3.3V?

 

no drawbacks as this complies with i.MX8M Plus power-up sequence, NVCC_xxx (1.8 V) -->

NVCC_DRAM-->NVCC_xxx (2.5 and 3.3 V).

 

> is it possible to use both 1.8V and 3.3V?

 

yes if it complies with i.MX8M Plus power-up sequence described in Figure 5. The power-up sequence

i.MX 8M Plus Applications Processor Datasheet for Consumer Products

 

Best regards
igor