ADE7753 WAVEFORM lengths from Ch1 and Ch2

[calviodotde]

I am using a very basic ADE7753 breadboard design with v-divider on Ch2 and 0R001 shunt on Ch1.

SPI-comm works fine, I can write to and read back the MODE register successfully. I set MODE to 0x4021 (WAVEFORM source Ch1) or 0x6021 (WAVEFORM source Ch2)

When I do 3-byte reads on the 24bit signed WAVEFORM, I get reasonable values with source Ch2 selected, like 0xFFF481 @ V=-10V
Reading WAVEFORM with source Ch1 selected, I get values like 0xFC7A00, i.e. LSB always 0x00.

Reading WAVEFORM Ch2 with swapped ADCs (i.e. with same physical source as before) returns a reasonable value of e.g. 0xFFFC7A.

Seems like Ch1 shifts left 8 bit when transferred into WAVEFORM-reg but Ch2 does not - what am I doing/getting wrong?

Thanks for any help or hints!

 

[Oleksa123]

Hi
I have the same problem
The reason is HPF enable/disable bit. When HPF is ON data is normal 3 byte, but without dc component. When HPF is OFF LSB is always 0
I don't know why, i think it's hardware bug, because all datasheets, appnotes and AD experts said that when HPF is off, it's normal and can measure dc current

I'll trying to solve this problem
Regards

 

[lmrzd]

i am working on the same project but can't get the Arduino to commmunicate with the ADE7753 can u help with your ccircuit diagram .(and possibly the codes )