VDD_SNVS_IN availability prior to other supplies w/o coin cell

[atillametetured]

Hello,

On our custom board, VDD_SNVS_IN of i.MX6 is supplied by pin 43 of the PF0100. There is a coin cell holder and 0.1uF capacitor connected at LICELL pin 42. 

VSNVS_VOLT[2:0] are OTP programmed to 110 MODE: VIN LDO 3.0V.

My question is, without installing the coin cell, is it still guaranteed that the VSNVS voltage will be made available before any other voltage rail? 

Datasheet says that if LICELL is valid before VIN, which in our case is not because we will not install the coin cell, VSNVS will start from 1.0V. What voltage does the VSNVS start from in our case, 3.0V?

And also remembering that the BOOT_MODE[1:0] pins are pulled to VSNVS rail, how does this affect their state. Say the LICELL was available and VSNVS started from 1.0V, doesn't this affect the boot mode pins being high/low?

Regards,

Mete

[art · Accepted solution]

If no coin cell is installed, the VSNVS voltage is available once the VIN voltage is applied. VSNVS starts from its programmed value (e.g. 3.0V).

Even when applying the coin cell for the very first time and VSNVS starts from 1.0V, it immediately goes to its programmed value (e.g. 3.0V) once VIN is applied. So, the boot mode selection is not affected in this case.

Have a great day,
Artur

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[atillametetured]

Anyone on this?

Mete