STC3115AIJT maximum current measuring capacity ?

[ASing.15]

Hello,

I am working with STC3115 and I would like to know, the maximum charging current that I can measure with it?

[Peter BENSCH]

Well, that is a question of design: the battery current is not measured directly, but via a shunt, which is why there is theoretically no upper limit.

However, the internal Sigma-Delta ADC is limited to 14bit and has a typical LSB value of 5.88µV. So the larger you make the current, the lower the resistance of the shunt and the coarser the measurement will be.

Regards

/Peter

[Winfred LU · Accepted solution]

Given the calculation:

Vin_gg = Rcg * IMax

with maximum input voltage (Vin_gg) at 40 mV and minimum current sense resistor (Rcg) at 5 mohm,

the maximum application charging current (IMax) will be 8A.

[ASing.15]

Thanks, Peter for your prompt reply.

[ASing.15]

Thanks, Winfred for your prompt explanation.