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General Category => Discussion - EVE => Topic started by: durian on May 03, 2023, 05:46:07 PM

Title: 1.2V regulator quiescent current draw
Post by: durian on May 03, 2023, 05:46:07 PM

On the BT818Q, I notice that the internal regulator still produces 1.2V on VOUT1V2 when the system is in POWERDOWN state. I'm trying to determine how much current the chip draws when in POWERDOWN and need to factor in the quiescent current draw from the regulator. I can't find this value in the datasheet. Is it included in the Icc1 figure shown in table 6-3? If not, can you provide it?

Also, table 6-3 show the maximum voltage for VCCIO2 is 2.75V. This conflicts with other parts of the datasheet that explicitly state that 3.3V can be applied to VCCIO2. I believe it is table 6-3 that is incorrect.

Thank you,
mike

Title: Re: 1.2V regulator quiescent current draw
Post by: Rudolph on May 04, 2023, 10:36:53 PM

I believe that table is not incorrect, but a bit misleading.
I believe this desribes ranges around 1.8V, 2.5V and 3.3V for all VCCIOn voltages.
I do wonder why this is structured as it is, why isn't the voltage range just from 1.62V to 3.6V?

Title: Re: 1.2V regulator quiescent current draw
Post by: durian on May 08, 2023, 07:40:24 PM

Hi Rudolph,
Yes, now that I look at it closer, I see that each of the three ranges applies to each supply: VCCIO1, VCCIO2 and VCCIO3. It is only an accident of formatting that each VCCIO is on a separate line. I should have noticed this.

And yes, it is weird that there are voltage gaps in the acceptable ranges. Is 2.1V or 2.9V really not allowed?

I'm still hoping someone can answer my primary question regarding Iq for the 1.2V regulator.

mike

Title: Re: 1.2V regulator quiescent current draw
Post by: BRT Community on May 09, 2023, 04:37:12 PM

Hello,

Thank you for your question, i will double check this with the hardware team.

Best Regards,
BRT Community

Title: Re: 1.2V regulator quiescent current draw
Post by: BRT Community on May 10, 2023, 03:54:50 PM

Hello,

The hardware team have confirmed that the listed Icc1 current in powerdown mode includes the 1.2V regulator current.

Best Regards,
BRT Community

Title: Re: 1.2V regulator quiescent current draw
Post by: durian on May 10, 2023, 04:03:53 PM

Thank you for checking. The datasheet only provides a typical value for Icc1 during power-down. Can you ask them what the maximum is?

mike

Title: Re: 1.2V regulator quiescent current draw
Post by: BRT Community on May 12, 2023, 03:11:13 PM

Hello,

According to the hardware team mac Icc1 is 2mA across PVT testing.

Best Regards,
BRT Community

Title: Re: 1.2V regulator quiescent current draw
Post by: durian on May 15, 2023, 05:53:01 PM

Thank you. That is important to know. The 10x difference between a typical current draw of 0.2mA and a max current draw of 2mA during power down is significant. Especially when powered by batteries.

mike