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MAXREFDES106# Health Sensor Platform 4.0
The BioZ channel can perform AC lead-off detection by
comparing the BioZ ADC output to the Threshold defined in
Low Threshold and High Threshold. If the output remains
over the High Threshold or under the Low Threshold for over
128ms, the BIOZ_OVER or BIOZ_UNDER status bit is
asserted.
Internal/External
Parasitic
Cancellation
Enable
Selecting ‘Internal Parasitic Cancellation Enable’ or ‘External
Parasitic Cancellation Enable’ helps mitigate the effects of
parasitic capacitances in the electrode-tissue interfaces to
ensure phase accuracy in the BioZ measurement. When using
External Parasitic Cancellation, internal guard amplifiers
output guard signals at the MAX86178 pins BIOZ_EL2A and
BIOZ_EL3A. Connect guard traces to these pins and surround
the BIP and BIN nets to mitigate the effect of parasitic
capacitances.
Enables the BioZ ADC to measure a buffered copy of the
voltage selected in Connect to BioZ Channel. Refer to the
MAX86178 data sheet BIOZ section for more details.
BioZ Mux Tab
See the available options in Table 13 for more details.
Figure 62. BioZ Mux Tab
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