ADE7753 WAVEFORM reading high with 0V input

[firmwaregirl]

Using the ADE7753 Eval board:

I am reading the WAVEFORM reg on the WSMP interrupt.

I have CH1N/CH1P and CH2N/CH2P tied to AGND, verified with a voltmeter to both be 0V inputs into the ADC.

On interrupt, with the CH1 setting I read ~0xff2928 (-55000) and with CH2 setting I read a more reasonable ~0xffff9c (-100).

Both of these readings are too big to offset with the CH1OS/CH2OS of +/-31, and the CH1 reading seems completely out of whack.

Any ideas?

 

[bobcat1]

Hi

Check whether the Clock is OK (3.58MHz)

Check whether the REF voltage is set to internal and it is stable

All the best

BObi

The microcontroller specialist