EV-ADE9153A SHLELDZ
Using that formula gives 11,252,238.3986163132
How do I calculate it, but does 1510.24987 come out?
ADE9153A
Recommended for New Designs
The ADE9153A is a highly accurate, single-phase, energy metering
IC with autocalibration. The mSure® autocalibration feature allows a meter to automatically...
Datasheet
ADE9153A on Analog.com
EV-ADE9153A SHLELDZ
Using that formula gives 11,252,238.3986163132
How do I calculate it, but does 1510.24987 come out?
I've had the same issue today and found the solution. I started by calculating the error factor
I've had the same issue today and found the solution. I started by calculating the error factor
I just look thru to document change list and found this. Will try to get this updated it can take a while. You found the exact thing that was wrong. Sorry for the inconvenience.
Equation incorrect, should be:
TARGET_WCC = TARGET_AICC * TARGET_AVCC * 2^27 * (1+APGAIN/2^27)
Dave
I investigated a bit further and can conclude that the document is just put together very badly. I also didn't like the magic value of 2^27, so I continued until I was able to derive all of this from first principles.
The issue is considering TARGET_AICC and TARGET_AVCC in their Unit/code values. Instead use the correct Full Scale Codes from Table 5. directly:
TARGET_AICC should afterwards be scaled down by 52725703
TARGET_AVCC by 26362852 and
TARGET_WCC by 10356306
Here is a short demonstration in python how I derived it from the beginning:
v_nom = 240 # Volts i_max = 10 # Amperes r_shunt = 0.001 # Ohms r_big = 10e6 # Ohms r_small = 1000 # Ohms pga_gain = 16 # Whatever setting you use ai_headroom = 1 / (pga_gain * r_shunt * i_max * 2**.5) v_headroom = (r_big / r_small + 1) * .5 / (v_nom * 2**.5) aicc = i_max * ai_headroom # max measurable value in Amperes avcc = v_nom * v_headroom # max measurable value in Volts wcc = target_aicc * target_avcc # max measurable value in Watts target_aicc = aicc / 52725703 target_avcc = avcc / 26362852 target_wcc = wcc / 10356306