ADS1298R右腿导联脱落检测问题

ADS1298R 手册里面讲了只有在RLD 放大器被power off 或者disable后，RLD的电压比较器才能工作。换句话说，RLD lead off 检测和 RLD out不能同时用。

如下的几种方法能否解决，请大家给点意见？

1，定时检测 就是周期power off 掉RLD_AMP放大器，这样可能导致一些sample值有噪声。

2，用不同的pin脚将共模电压送回到人体。

 利用RLD重定位的功能，但是需要在RLD_INV和RLD_IN两个pin之间串上个RLD_AMP。这样就导致不能有些导联没法测量。

3，在片外重新搭独立的RLD lead off 检测电路。

请大家给点意见啊！

1298R的EVM如何配置，可以用来验证RLD lead off 检测的功能？

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.

您好 我也在做这个 能不能互相交流下 我邮箱bruellyyang@126.com