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Question, i.MX233 power supply 2

Question asked by AVNET JAPAN FAE (team share account) on Aug 27, 2014
Latest reply on Aug 3, 2016 by Tobias Diendorfer

Hi team,

 

I have some questions on internal power supply feature of i.MX233.

(1)

In my understanding, the pins for output power are different depending on using internal DCDC or Linear regulator.

In the case of using internal DCDC, the DCDC can pupply voltage to the following pins.

- DCDC_VDDA, DCDC_VDDD, DCDC_VDDIO, VDDM

In the case of using internal regulator, not using DCDC, it can supply the voltage to the following pins.

- VDDIO33_1, VDDIO33_3, VDDD1, VDDD3, VDDA1, VDDIO_EIM1, VDDIO_EIM2, VDDM

Am I correct?

(2)

Can you provide the characteristics on the power-on rising of the power supply pins powered by linear regulator?

(3)

My customer does not use internal DCDC of i.MX233.

And they believe the L, seen in the schematic of EVK, located between DCDC_LN1 and DCDC_LP pins can be removed.

Is it correct?

If so, DCDC_LN1 and DCDC_LP can be left unconnected?

(4)

The customer believes that the capacity of the decoupling capacitors ,used in i.MX233EVK, connected to DCDC_VDDIO, DCDC_VDDA and DCDC_VDDD pins is too large in the case of not using DCDC.

Could you give me your suggestion what the capacity number should be fine for those decoupling capacitor?

 

Thanks,

Miyamoto

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