Power Supply for nRF52840?

[skydiver]

Hello,

I would like to use the nRF52840 for a wearable. It should be powered by a lipo-battery with 3.7V. Therefore I would solder it to the VDDH and Ground Pin (VSS). Is that right? I am new to electronic engineering. 

Furthermore I would like to make IT rechargeable. I am thinking about using the Adafruit Lipo Charger. Can I simply solder it to the board? Which are the pins for such a component or what do you recommend to create a rechargeable Board?

Kind regards

[skydiver]

Can you tell me to which pins it should be soldered? 

E.g. this charger: www.exp-tech.de/.../lipoly-charger

[Kaja]

Do you have a datasheet? 

Based on the pictures, it seems that if you want to solder it to the pcb, it should be enough to solder the ground crones. 

Best regards,
Kaja

[skydiver]

I thought about soldering it directly to the bluetooth module without an extra pcb. The schematics for it are below:

The datasheet: https://infocenter.nordicsemi.com/pdf/nRF52840_PS_v1.1.pdf

I thought about using the cable which is included. It has a red and a black wire (as seen in the image).

Best regards

[Kaja]

Hi Timo, 

sorry for the delayed response, because of vacation time, we are low on staff, but I will get back to you early this week. 

Best regards,
Kaja

[Kaja]

Hi Timo, 

I was asking for the datasheet for the Adafruit Lipo Charger. 

skydiver said:

I thought about using the cable which is included. It has a red and a black wire (as seen in the image)

 - That seems fine to do.

Best regards,
Kaja

[skydiver]

Should I connect the battery to the BLE module and then the charger also to the BLE module? (A) Or should I connect the battery to the charger and then only the charger to the BLE module? (B) For option B: How would it be connected to the chip?

[Kaja]

Hi Timo, 

the expert on this is on vacation, but do you want to charge the BLE module with the battery when charging or do you want the device to be directly powered via the charger when charging?
The Thingy52 is a very good example with rechargeable battery: Thingy52 - Hardware files 1_0_0.zip

Best regards,

Kaja

[skydiver]

The battery should power the ble module all the time. So it should also power the module when it is charging. Will it also be powered from the remaining battery (even if no charging cable is connected) if it is not directly connected to the ble module?

[Kaja]

Hi Timo,

I though I answered this, but the reply is not here.. but:
Then you connect the battery charger to the battery only, like it's done on the Thingy52.  

skydiver said:

Will it also be powered from the remaining battery (even if no charging cable is connected) if it is not directly connected to the ble module?

 - Yes, I believe so. 

Best regards,
Kaja