ADS1298R右腿导联脱落检测问题

兄弟姐妹们，给点意见啊。

Hi Andy,

The RLD leadoff will not work in continuous time with the ADS129x family. The problem lies in that, when the RLD lead is disconnected, the pull down resistor/current source is not able to pull the pin low since the RLD amplifier is driving the node to a fixed voltage. The RLD amplifier would need to be powered down to allow the pull down current source to bring the line low to trigger the comparator. We state in the data sheet that the RLD lead off detection cannot be used during normal operation for this reason.

In order to be able to pull the line low, the RLD amplifier needs to be powered down. Once the RLD amplifier is powered down, RLD_LOFFSENS bit needs to connect the line to the comparator. Last thing to check is the status of the RLD_SENSP and RLD_SENSN bits which are used to route the inputs from any of the channels back through the RLDAMP. If any of those are set to 1, then you are routing an input back through the unpowered RLD amplifier so it will just route back through the RLDINV pin and out across any feedback resistor. Again, you will have a problem pulling the line low if there is a voltage driving the line. Make sure the RLD_SENSP and RLD_SENSN bits are all set to 0.