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operating voltage restriction between LDO_SOC and LDO_PU in i.MX6DL

Question asked by Mamoru Kanou on Oct 7, 2016
Latest reply on Oct 9, 2016 by Yuri Muhin

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

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