I have made a schematic using ADE7753. Attached is the ckt.
ADE7753 is powered from 5V & micocontroller is 3.3V one.
1. In the ckt I found that neutral of system has to be shorted with microocntoller ground & ADE7753 ground. Is it ok? Is this how it is done?
2. Is there any way I get to know that line & neutral are interchanged in the system. Because I have seen generally in house meters there is led indication showing if line is connected to neutral & neutral is connected to line.
3. I have to connect it to 3.3V micocontroller. In datasheet of ADE7753 VIH is 2.4V or I think all ouput lines on SPI can be connected to MCU directly while for MISO I connected a 1K resistor in between. Is it ok?
4. Max adc inputs for ADE7753 are 0.5V max. So calaculations for voltage are:
R4: 1M (will connect two 500k in series)
R5:1K
At 275Vacrms, 50Hz, Vp= 389Vp
So voltage at input = (R5/(R4+R5) * Vp = 0.39
So I think its ok
5. Max cuurrent to be measured = 50Aacrms
So Ip= 70.71V
With CT of 1800:1; I = Ip/1800 = 0.039V
With burden resistor of 10ohm V = 0.392V
6. Are above calaculations ok?
7. Is ckt ok?
8. Is there any example code. I found some of net:
https://searchcode.com/codesearch/view/17414705/Will took reference from this code & see if it works.