Hi,
There are a lot of vague hints that VDD_HIGH_IN needs to be powered on before the core voltages of the SoloX (VDD_ARM_IN and VDD_SOC_IN) in data sheets (4.2.1 of the IMXSXCEC.pdf document) and also in the design of the SoloX Sabre Board (using the F6 version of the PMIC). Yet, it isn't specifically called out. Does VDD_HIGH_IN need to be powered before the core voltages (VDD_ARM_IN and VDD_SOC_IN)?
Thanks,
Scott
已解决! 转到解答。
Hi Scott
power-up sequence is decribed in sect.4.2.1 Power-Up Sequence
http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SXCEC.pdf
Also one can use verified on Sabre board sequence with F0200F6 and
VDD_HIGH_IN powered before core voltages. VDD_HIGH powers control logic
of internal ldos, so powering it first allows for more smooth rising of other power
supplies. None programmed version PF0200NP can not be used as it is designed
for further programming for customer needs.
Best regards
igor
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In the Solo/Dual/Quad, sequencing DCDC_Low and DCDC_High didn't make a difference. Notice that in the SDQ, VDDSOC_IN and VDDARM_IN are internally connected in the reference manual. However, see in the PMU block for the SoloX PMU, they have been broken out for separate supplies, but the wording in the paragraphs following looks to be the same as the Solo/Dual/Quad indicating “the number of external supplies is reduced to two.” But, it's actually four according to the SoloX diagrams.
Regardless, the SABRE Board connects VDD_ARM_IN and VDD_SOC_IN together using the PF0200F6 PMIC leaving DCD_DDR and DCDC_High to be powered separately.
The question to NXP is the pre-programmed PF0200F6 PMIC required to correctly get the SoloX up and running verses using the none programmed version - PF0200NP in a design?
Hi Scott
power-up sequence is decribed in sect.4.2.1 Power-Up Sequence
http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SXCEC.pdf
Also one can use verified on Sabre board sequence with F0200F6 and
VDD_HIGH_IN powered before core voltages. VDD_HIGH powers control logic
of internal ldos, so powering it first allows for more smooth rising of other power
supplies. None programmed version PF0200NP can not be used as it is designed
for further programming for customer needs.
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------