This is the schematic.
Our customer uses the RLD lead-off detection function of ADS1292R. When the electrodes fall off, It is mistakenly reported as IN2N falling. This phenomenon is not only present on their PCBA, but also in TI’s demonstration kit (ADS1X9XECG FE + Fluke ProSim 8 Vital Signs Patient Monitor Simulator).
Here are their test processes:
- Using ADS1X9XECG FE and ProSim 8, connect 3 electrodes : RA,LA,RL
- Set the relevant registers at “LOFF and RLD” tab.
- Set four configurations at “register map” tab in turn.
- Click “Live ECG” tab, and disconnect the RL electrode from the emulator. Wait about 1-2 minutes to observe the off status indicator.
Configuration1:
Phenomenon 1:
Configuration 2:
Phenomenon 2:
Configuration 3:
Phenomenon 3:
Configuration 4:
Phenomenon 4:
The above 4 kinds of configurations, will report IN2N fall off, in 1-2 minutes after the electrode was disconnected.
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Phenomenon 5:
No abnormalities after disconnecting all electrodes.
