STPM01 IC - Offset Values at Zero Voltage

savanth · ‎2025-04-23

I have been working, with STPM01 as a peripheral device with my micro controller to develop a e meter. On development with board, on testing on no voltage and no current or in case of voltage ( 220 - 240 AC ) AC and no load current. During these time the RMS value of current and voltage are non zero values, there is a offset error value of 4, or 5 in decimal. I there any solution to solve this offset.

My other issue is that when there line voltage, but no current is taking but the active register is incrementing by 2 decimal. event though the BIL is high indicating there is no LOAD. Still the counter is counting, is this normal or is there any method to solve this.

Andrew Neil · ‎2025-04-23

Note that STPM01 is Not Recommended for New Designs (NRND):

PS:

Don't forget to give the link from your previous post in the old thread.

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.