Hi all,
I wonder how to carry out the function Digital AC Lead-Off Detect with ADS1293. In this mode, how to config LOD_EN register ? The example in the datasheet makes me confused. First there seems no something about CH3, then it need to config CH3. The following is the original text of the example.
Thanks a lot !
Consider an example where the first AFE is configured through
the flexible routing switch to measure the voltage between IN1 and IN2, and the second AFE is configured
through the flexible routing switch to measure the voltage between IN2 and IN3.
In this configuration, if digital AC LOD test currents are applied to the inputs of both AFEs, the test current that is
applied to the negative input of the first AFE and the test current that is applied to the positive input of the
second AFE are both flowing through IN2. Depending on the sign of the test current in the second AFE, these
currents can add up or cancel each other. If the currents add up, the system will correctly measure the
differential input impedance on both AFE channels. If the currents on IN2 cancel, the test current will only flow
through IN1 and IN3, and the impedance of the electrode connected to IN2 cannot be measured. To apply the
digital AC LOD to CH3 and CH2, set EN_LOD[2] = 1 and EN_LOD[1] = 1. Then, by programming EN_LOD[5] = 0
and EN_LOD[4] = 1, CH3 and CH2 will receive excitation currents in-phase and anti-phase, respectively.