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ADS1298 RLD lead-off detection
Part Number: ADS1298
I am able to get the Lead off status of all the Leads except RLD. For other leads I am using pull up / pull down method. And it works great so far
I am reading the data at 512 samples / sec in RDATAC (read data continuous) mode.
As per I understand from the datasheet and by going through other threads that to get RLD status we need to power down the RLD amplifier and get the status by reading the CONFIG4 register. But in order to do that I must send SDATAC command first to stop the conversion and do the above mentioned things. Am I right ?
If that is the case I really would not like to do that.
I had another idea please tell me if this works.
In the below schematic RLD_LPF / RLD_OUT (marked in Red)is connected to hardware low pass filter in turn it connects to patient. I observed that if RL lead gets loose the voltage on that pin goes to -2.5v almost immediately. So Can I monitor this pin by my host processor STM32F4 using a hosts 12 bit ADC ? and decide the lead off status independently ? Or do you see any problem with this approach ?
Applications Engineer | Precision ADCs
Are you working on a bio-potential application? Check out these helpful resources:
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