Requirement of operating range with i.MX6SL

[ko-hey]

Hi all

My customer will start a development for first prototype and want to confirm about requirement of operating range with i.MX6SL.

Does user must to satisfy a following requirement ?

(The requirement is described in IMX6SLCEC)

「VDD_ARM_IN and VDD_SOC_IN must be at least 125 mV higher than the LDO Output Set Point for correct voltage regulation.」

They measured CPU's core voltage levels with SABRE-EVK. But EVK doesn't satisfy the requirement.

Please see a following table.

Why EVK doesn't satisfy the requirement ?

NXP suppose that EVK is only for emulation use, so EVK deosen't satisfy the requirement.

Is it correct ?

As a result, user must set following register value to satisfy the requirement by themselves.

Is it correct ?

REG2_TARG

REG1_TARG

REG0_TARG

Ko-hey

[art]

Actually, seems that the measurements have been done in LDO bypassed mode, so, all the voltage values are within their operating ranges. Generally, planning the design, the customer always should follow the requirements of the latest revision of the Data Sheet document, please find it attached.

Have a great day,
Artur

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[ko-hey]

Hi Artur

I agree with you that they have measured in LDO bypassed mode.

How about following requirement ?

Do we must follow it whether using LDO bypass or not ?

If we must follow it, please let me know how to do.

VDD_ARM_IN and VDD_SOC_IN must be at least 125 mV higher than the LDO Output Set Point for correct voltage regulation.

Ko-hey

[art · Accepted solution]

This requirement is valid only for LDO On mode, not for LDO Bypass mode. So, you have not to follow it for LDO Bypass mode.

Artur

[ko-hey]

Hi Artur

I understand that the requirement is for LDO enable mode.

How can I satisfy the requirement when I use LDO enable mode ?

We need to set following registers. Is it correct ?

REG2_TARG

REG1_TARG

REG0_TARG

Ko-hey

[art]

First, you have to set the REG0_TARG, REG1_TARG and REG2_TARG fields to define the target supply voltages for the ARM, SoC and VPU/GPU power domains, correspondingly. Then, for LDO Enabled mode, you have to configure external supply voltages (VDD_ARM_IN, VDD_SOC_IN and VDD_PU_IN, correspondingly) to be at least 125mV higher than these target voltages for normal operation.

Artur

[ko-hey]

Hi Artur

Thank you for your support.

I understand.

Ko-hey