Author Topic: Frecuency response  (Read 269 times)


  • Newbie
  • *
  • Posts: 1
Frecuency response
« on: November 22, 2018, 09:13:45 PM »
Hi...I have an ultra low power node where in sleep mode the current is ~150nA. At certain time, the mcu awakes and the current raise to ~65uA@50uS then a radio transmition occurs ~25ma@130uS then the system goues back to sleep. Is the current ranger able to register all this events (based on the short time every state last)?. Thanks in advance for the support


  • Administrator
  • Hero Member
  • *****
  • Posts: 6281
  • Country: us
    • LowPowerLab
Re: Frecuency response
« Reply #1 on: November 23, 2018, 11:26:01 AM »
What exactly do you mean by "registers"?

It depends how fast the states are changing, but is your node transmission time only 130us?
100uS events are basically too quick for the autoranging if that's what you're after.

The default firmware is "middle of the road" in terms of how fast it responds. It takes a few ms to sample and react to an overload.
If you were to use interrupts and only focus on speeds, then the response could be less than 1ms.

The analog output will respond very fast. If you manually range and watch the output on a scope you will see 100uS events (eg your transmission) without a problem.
« Last Edit: November 23, 2018, 11:27:40 AM by Felix »