operating voltage restriction between LDO_SOC and LDO_PU in i.MX6DL

[kanoumamoru]

Hi !, community.

I found operating voltage restriction between LDO_SOC and LDO_PU in iMX6SDL datasheet IMX6SDLAEC (Rev. 5, 06/2015)

----- Page 26, Note4

In LDO enabled mode, the internal LDO output set points must be configured such that the:
• VDD_ARM LDO output set point does not exceed the VDD_SOC LDO output set point by more than 100 mV.
• VDD_SOC LDO output set point is equal to the VDD_PU LDO output set point.
The VDD_ARM LDO output set point can be lower than the VDD_SOC LDO output set point, however, the minimum output set points shown in this table must be maintained.

-----

But, our customer set each LDO voltage with LDO enable mode as follow:

(They use custom linux OS.)

- LDO_SOC_CAP = 1.200V (PMU_REG_CORE [REG2_TARG] is set to 10100)

- LDO_PU_CAP = 1.150V (PMU_REG_CORE [REG1_TARG] is set to 10010)

That is LDO_SOC_CAP and LDO_PU_CAP are not same voltage setting.

What will be a problem in this case ?

BR,

kanou

[Yuri · Accepted solution]

Hello,

  The restriction, that  VDD_SOC LDO  should be equal to the VDD_PU LDO,

should be provided to avoid internal leakages on i.MX6. Please pay attention on imperative

of the restriction.    

The recent i.MX6 S / DL Datasheet(s) [Rev. 7, 10/2016] may be found

on the Web.

 Summary Page :

< http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process... >

Have a great day,

Yuri

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