Hello,
i am working on a design using i.MX7D using the PF3000 (without LICELL), and i am trying to figure out how to handle the power-down sequencing. I would appreciate your help regarding the following questions:
Thank you very much in advance for your help!
Best regards,
Sebastian
Hello
Please look at my comments below.
1.
Please refer to i.MX7 designs :
EVK :
WaRP7 :
Design file for WaRP7 board (Schematics & P... | element14 | Technical Library
2.
Strictly speaking, no need for reset before power down.
3.
According to the Datasheet(s) :
“Any deviation from these sequences may result in the following situations:
• Excessive current during power-up phase
• Prevention of the device from booting
• Irreversible damage to the processor (worst-case scenario)”
4.
Usually capacitors prevent fully unexpected supply voltage removing.
Please refer to Table 7 (Power supply decoupling recommendations)
of the Design Guide.
http://www.nxp.com/assets/documents/data/en/user-guides/IMX7DSHDG.pdf
5.
Basically the ONOFF pin may be used to inform PMIC (via PMIC_ON_REQ) to turn
off the i.MX7; but the i.MX7 ONOFF pin in itself does not protect i.MX7 device.
Have a great day,
Yuri
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