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Using PF8121, MC32PF8121EUEP, to supply voltage to i.mx8 mini quad

Question asked by Faiz Ahmed on May 14, 2019
Latest reply on May 14, 2019 by G.w. Sun

Hello,

 

I am planning on using PF8121 for our application, specifically, MC32PF8121EUEP. This is the power tree I have based on the i.mx8m mini quad evk:
BD71847MWVMC32PF8121EUEP
SequencePWR/SignalREGVoltageSequenceREGVoltage
1NVCC_SNVS_1V8LDO11.80vsnvs1.8
2VDD_SNVS_0V8LDO20.81sw10.8
5VDD_SOC_0V8BUCK10.82sw50.8
6VDD_DRAM&PU_0V9BUCK50.92sw20.9
6VDD_PHY_0V9LDO40.92ldo31.8
7VDD_ARM_0V9BUCK20.93sw30.9
7VDDA_1V8LDO31.83ldo41.8
8VDD_1V8/NVCC_1V8BUCK71.85sw41.8
9NVCC_DRAM_1V1BUCK81.16sw61.1
10VDD_3V3/NVCC_3V3BUCK63.37sw73.3
10NVCC_SD2MUXSW3.3/1.87ldo23.3/1.8
11VDD_PHY_1V2LDO61.24ldo13.3
It doesn't seem that voltage map 1:1 so I had a couple of questions:
1) For VDD_SNVS_0V8, I am using a switch (SW1) instead of LDO (LDO2). Do you think this could cause an issue?
2) For VDD_PHY_0V9, I would need an external LDO from 1.8V to 0.9V, correct?
3) For NVCC_SD2, do you see any issue with using ldo2 instead of muxsw?
4) For VDD_PHY_1V2, I would need an external LDO from 3.3V to 1.2V, correct?
5) As you can see in column 5, the power on sequence is different than EVK. Would that cause any issues?
Thank you,
Faiz Ahmed

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