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MAXREFDES106# Health Sensor Platform 4.0
Available Options
Table 13. BioZ Mux Configuration Options
Mux Enable/DRVP
Assign/DRVN
Assign/BIN
Assign/DRVN
Assign
Enable/Disable a Specially Programmed Mux that
Assigns the IC Pins to the IC Internal Paths DRVP, BIP,
BIN, and DRVN to Support Various BioZ Applications.
Disabling the Mux Disconnects All Electrode and
Calibration Pins. Enabling the Mux Connects Electrode
Pins as Selected by the DRVP Assign, BIP Assign, BIN
Assign, and DRVN Assign.
Enable DRVN lead-off detection.
DC Lead-Off
Detection Enable
Enable/Disable the DC Lead-Off Detection.
Current Magnitude/
Polarity
Define the DC source and sink currents.
When performing DC lead-off detection by injecting DC
current and comparing the differential voltage across BIP and
BIN to the voltage thresholds selected in Threshold.
Lead-biasing for the BioZ channel drives the electrodes within
the input common-mode voltage requirements of the BioZ
channel. It is recommended to enable both BIP Resistive
Bias and BIN Resistive Bias.
BioZ Calibration Tab
This tab configures the calibration to ensure accurate impedance measurements. For proper calibration,
gain and phase errors need to be calculated for each stimulus frequency. Refer to the MAX86178 data
sheet ‘Calibration’ section for a full description of the calibration procedure and equations to calculate
gain and phase errors.
The calibration procedure uses either internal programmable resistors or an external calibration resistor
connected at the calibration pins. A default calibration file is loaded when the MAXREFDES106# GUI is
opened.
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