Choosing 6 different schematic for Nrf52840

[Ekmekci]

Hello, 

I am trying to designe my own iot sensor board with nrf52840

For my sensor board i will just add lipo charger IC and MPU6050 (accelerometer) 

When i look at designe reference there are 6 different schematic.

I dont know which one i need to use, which one fit for me.

I just get accelerometer datas and power supply is 3.7V(1S) LiPo battery. I will use ultra lowpower mode.

I am waiting your valuable suggestions.

Best regards

[Simonr]

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

[Ekmekci]

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,

[Simonr]

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