nRF52840 power configuration

[vivekt]

Dear Sir/Madam


I am currently designing a IOT board using nRF5284 as the main controller IC

The board is battery powered and is charged using USB. Data can also be transferred using USB.

The nRF52840 is also used to transfer data using BLE. NFC is not used


Below are my queries


1.  The board works on 1.85V supply. In this condition I am not sure what supply configuration I should use. Can I use Config 3. as mentioned in page 529 of the datasheet.

Both VDD,VDDH =1.8V.   Can we connect 1.8V to VDDH in Mode 3.


2. Please provide reference Layout file for the Bluetooth Connection

Thanks & Regards

Vivek.T

[Jared]

Hi

What is the voltage range of your battery source?

Cheers 

Jared 

[vivekt]

4.2V to 3.3V

[vivekt]

Also then what will be the IO voltage range(VOH/VIH) for all the GPIO pins.

[Jared]

Hi

I'm not sure I understand your setup correctly. You mention that your source is 1.8 V, why is your battery range 4.2 V to 3.3 V than? 

As stated in the product specification: "In normal voltage mode, only the REG1 regulator stage is used and the REG0 stage is automatically disabled. In high voltage mode, both regulator stages (REG0 and REG1) are used."

The high-voltage mode does therefore use more energy as the system use a two-stage regulator setup.

Jared 

[Jared]

Hi Chris

We had some problems on devzone earlier today but it's fixed now. Please create a new ticket for your question.

Cheers

Jared