What does Deep-FS mode means?

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What does Deep-FS mode means?

Contributor I

simplified functional state graph.JPG

While reading a datasheet of FS84;FS85, i found the deep-fs mode in the simplified functional state graph. But the data sheet only mentions about how to get in the Deep-FS mode, not the meaning of it. What does Deep-FS mode means in detail, and what's the difference with Normal-FS mode? Why does we need Deep-FS mode?

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NXP TechSupport
NXP TechSupport

Hi Suyeon,

Deep failsafe is when, from normal mode Normal-FS, the device has a critical failure (for example several consecutive bad watchdog, RESETB asserted for longer than 8s, VPRE OV, REG Thermal shutdown, …), and the device needs to go into deep failsafe deep-FS mode, in order to shutdown everything for safety purposes, and try again to power up later on.

Normal-FS is when device operates normally and all is good, deep-FS is when everything is shutdown because of critical failure.

Best regards,



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