CubeCell capsule, Vext and power?

#1

Hi

I looked for the schematics, but for the Capsule at least I didn’t find it.

If you measure the sleep current for the LowPower_WakeUpByGPIO example,
its in the order of 60uA, great! (using a simple DMM, so take the numbers with a grain of salt).

HOWEVER, if you add/enable Vext for the example (I need Vext to power the MPU9250 sensor) the sleep current is now around 800uA, and that is less than stellar.

With the MPU9250 set to WakeOnMove, the current is around 1.5mA, and that is definitely not good for low power applications.

Note: I have removed the capsule from the dev board when measuring, or you add another 1 mA or so.

So: is there a way to keep the sleep current down AND enable Vext ?

#2

The mpu will draw its power when you let vext on during sleep. That is not the sleep current of the capsule it is the current the mpu draws

#3

Yes, I suspected as much, so I removed the mpu9250 (and just enabled Vext) so there must be something else thats drawing power.