Powering Seeed Studio XIAO nRF52840 Sense with another microcontroller?

Products & Technology Arduino & Seeeduino
#1

Hi,

I’m working on a project where I need two microcontrollers.

  1. Seeed Studio XIAO nRF52840 Sense
    and 2. A Teensy 4.1

The Teensy needs to communicate over the USB connection, but the Seeed does not.

I’m trying to find a way to power the Seeed board from the Teensy. The teensy has a 3.3v output at 250 mA max and it looks like the Seeed operates at 3.3v at 200mA.

Things look good! But-- I’m having trouble figuring out how to connect said power to the Seeed board. There’s no VIN pin as far as I can tell, only the battery pins on the bottom of the board.

Any thoughts about how I could make this work?

Thanks!

#2

Please see the link below, there may still be a schematic for XIAO_BLE.

“Seeed Studio XIAO nRF52840 Sense — スイッチサイエンス ”

#3

I’ll take a look. All I’ve found thus far hasn’t helped unfortunately.

#4

My opinion would be VIN but " because you’re not using the USB port on XIAO" then the 3.3v pin and GND is all you need to connect. What’s the issue? no LDO or regulation but the teensy is doing it. I see on the schematic he linked you, VIN would be ideal but 3.3v pin looks like it would work.

3.3v
3.3v1337×628 51.3 KB

HTH
GL :slight_smile:

#5

NICE. Thank you!! I’ll try that out.