ADS1294R missing DRDY signals

Arun Kumar27

Intellectual 590 points

Other Parts Discussed in Thread: MSP430BT5190, ADS1294R, ADS1299

Hi,

I am working on MSP430BT5190 and ADS1294R.

ADS1294R is configured for continuous mode(RDATAC), 250SPS.

I am able to collect the ECG data on channel 3. From the waveform it looks like i am missing some of the samples.

So i connected the DRDY and p4.7 (flag to make sure i am reading the data) to CRO. Following is the snapshot of the CRO.

After every 3 or 4 cycles, one or two DRDYs are missing and i am still reading the data, which is wrong.

yellow-->DRDY

blue-->DataRead(P4.7)

What might be going wrong?

Thanks & regards

Arun

over 10 years ago

0 Andreas Brunner over 10 years ago

Intellectual 360 points

Hi Arun,

have you already checked your START and CS signals?

0 Arun Kumar27 over 10 years ago in reply to Andreas Brunner

Intellectual 590 points

Hi Andreas,

Thanks for the reply.
Yes I have checked the START and CS signals.
Nature of CS is same as the DataRead flag (blue) in the above graph but the difference is it is active low.(Remains high always, low when DataRead is high).
Before i send RDATAC command i am making START high, so it remains high throught.

Regards
Arun