How to calculate Required mA= NxCxVx(0.5xF) in i.MX8MM

[andychien]

Dear Sir,

Our customer see schematic of i.MX8MM EVK.

See required mA= NxCxVx(0.5xF) on power table.

Could you tell us how to calculate it?

Thanks,

[igorpadykov]

Hi Andy

please note that this formula is just raw estimation, for example

N=1 pin, C =30pF  (30* 10**(-12) ), U=3V, F= 100MHz (100* (10**8))

I=5mA.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[andychien]

Hi sir,

For your example: 

N=1 pin, C =30pF  (30* 10**(-12) ), U=3V, F= 100MHz (100* (10**8))

Imax=1x30* 10**(-12) x3x(0.5x100* (10**8))=4.5mA (not 5mA right????)

For NVCC_DRAM_1V1

N=68

C=30PF

V=1.1V

F=1.5GHz

Imax=NxCxVx(0.5xF)=68*30p*1.1*(0.5*1.5G)=1.683A

The current seem big, please help check it is right.

Thanks,

[igorpadykov]

Hi Andy

formula is given for rough theoretical estimation.

Real life case numbers one can find in

i.MX 8M Mini Power Consumption Measurement

Best regards
igor