THINGY 53 : remove the DCDC between Li-ion cell and the system ?

[sarahHtn]

Dear, 

I would like to remove the DCDC converter in between the li-ion cell which is supplying the system and the system. 

The idea is to use our micro battery as the supply and the voltage is about 2.7V. I will use a boost converter to provide a 3.3V but I am wondering if I can remove the U15 IC and provide a 3.3V to VREG. 

Should I also connect the VLi-ion to VREG because the SW needs the BATTERY signal (measuring the voltage of the battery) ? 

About the U15 power switch, what is the purpose of this switch ? 

About the sensors, I would like to switch them off by SW, how to you recommend me to proceed ? I am not familiar with SW design so do you think this is feasible ? 

Thank you for your time, 

Sarah 

[JONATHAN LL]

Hi Sarah,

I am not sure what exactly you are referring to when you say regulator and U15. The Thingy53 does only have one regulator if we don't consider the power management chip nPM1100 (U3) . And that would be U6, its the 3.3V regulator.


Why would you like to use a different battery?

About the sensors, I would like to switch them off by SW, how to you recommend me to proceed ? I am not familiar with SW design so do you think this is feasible ?

You can pull down the SENS_PWR_CTRL, this will power off the sensors.







Regards,
Jonathan

[sarahHtn]

Hello Jonathan, 

My apologies, I meant THINGY 52 not the 53... 

I saw on the documentation the voltage regulator U14 XCL210C33 used from the li-ion battery. 

And the U15 used as a switch. 

About the sensors, ok but is there a way to keep part of them like accelerometer, temperature and humidity ? 

On a previous board, I did removed some sensors from the board but I have a consumption of 7mA all the time and the device does not emit so I supposed that I cannot remove them just like that and maybe the SW is waiting from some signals to move to low-power mode and emitting mode. 

Thank you for yout time. 

Sarah 

[JONATHAN LL]

Thanks for the clarification Sarah,

Where are you measuring the power usage?

Have you cut SB2 ?

What code are you using?

sarahHtn said:

About the sensors, ok but is there a way to keep part of them like accelerometer, temperature and humidity ? 

If you are comfortable soldering\de-soldering then you can always just remove them physically, but then you loose some of the sensors.

What do you want to achieve?
Are you using the Thingy52 for a specific task and don't need all the sensors + need a different type of battery for longer operational time?


Regards,
Jonathan