sprintf increases by 2-3uA per parameter as the parameters increase. huge current.

[Alex]

I encountered sprintf with the increase of parameters, the power consumption will increase by 2-3uA for each parameter. When I use the sprintf function, the power consumption is related to the number of parameters. My data  sampling frequence is 100Hz.

Who can help me?

[Turbo J]

Are those parameters of float type? There is an exception for float values in variable argument functions (like all printf variants): Floats are automatically converted to doube type. This conversion (and the corresponding calculations inside sprintf) are a little more expensive than to simply copy a value onto the stack.

[Alex]

My variable argument is interger.The current is also 2-3uA.

Is there other situation?

[Turbo J]

No, but the NRF core consumes about 5-10mA during execution.

Your 2-3µA increased average (my guess here) might actually be the additional CPU time required to generate and/or handle the string result.