Choosing 6 different schematic for Nrf52840

RE: Choosing 6 different schematic for Nrf52840

Simonr — Mon, 18 Feb 2019 14:37:34 GMT

Hi Ibrahim

Depending on the operating mode this varies, but under Electrical Specification in the PS you can see a variety of current consumption in various modes, and the DCDC regulator is generally notably more efficient.

Best regards,

Simon

RE: Choosing 6 different schematic for Nrf52840

Ekmekci — Mon, 18 Feb 2019 12:02:09 GMT

Thank you for your help,

The last question, i looked into Ps but i couldnt find.

Is there any current information if i select LDO or DCDC,

For example LDO power consumption = xxx uA

DCDC power consumption = xxx uA

Best regards,

RE: Choosing 6 different schematic for Nrf52840

awneil — Mon, 18 Feb 2019 11:42:29 GMT

Go on:

RE: Choosing 6 different schematic for Nrf52840

Simonr — Mon, 18 Feb 2019 11:40:34 GMT

Hi Ibrahim

Seeing as you want a board able to run in ultra low power mode, I would recommend a board that can use the DCDC regulator (One able to run DCDCEN1), as this regulator is the most efficient in terms of current consumption. That leaves you with configuration 4 and 5. Config 4 being supplied by VDDH (Minimum input voltage of 2.5V), config. 5 supplied by VDD (Minimum input voltage of 1.7V), and having the possibility of NFC. Both will do fine for your application and it is up to you, although I'd recommend config. 5 without the NFC parts (unless you want NFC functionality).

Best regards

Simon

RE: Choosing 6 different schematic for Nrf52840

Ekmekci — Mon, 18 Feb 2019 10:45:37 GMT

If i could find, what does PS tell me, believe me i didnt post it here 🙂

I am just trying to make sure i am doing right thing. Because i will draw pcb and printed it. If i have mistake it will cause cost and time to me

If you have suggestion share with me

RE: Choosing 6 different schematic for Nrf52840

awneil — Mon, 18 Feb 2019 10:40:44 GMT

[quote userid="76860" url="~/f/nordic-q-a/43804/choosing-6-different-schematic-for-nrf52840/171595"]What is the differences between VDDH and VDD[/quote]

What does the Product Specification tell you?

RE: Choosing 6 different schematic for Nrf52840

Ekmekci — Mon, 18 Feb 2019 10:37:04 GMT

Dear Awneil,

Yes i looked into Reference circuitry and table.

Actually first question is, What is the differences between VDDH and VDD, for example when i want to use 1S LiPo which one i need to choose.

Second question is, I dont want use USB and NFC, so i will choose config 6, but i dont know if i will not use DCDC i will cause problem ?

Best regards,

RE: Choosing 6 different schematic for Nrf52840

awneil — Mon, 18 Feb 2019 10:26:58 GMT

Did you look at the general guidance at the start of section 7.3 "Reference circuitry" on page 528 of the Product Specification v1.0 ?

Did you look at the table which summarises the features of each configuration - page 529?