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MAXREFDES106# Health Sensor Platform 4.0
during the measurement. The maximum possible value is
configured with the LED range setting.
Sets the offset for the two-bit offset DAC in µA. This allows
for extending the optical dynamic range by sourcing some of
the exposure current to the offset DAC. This feature is
especially useful under certain conditions that occur when
attempting to limit the exposure ADC counts. For example,
when avoiding saturation while increasing the exposure-
signal perfusion index.
Ambient Light Cancellation Method.
Central comprises three ADC conversions: two ambient and
one exposure conversions. Recommended for most use
cases.
Forward comprises two ADC conversions: one each of
ambient and exposure conversions.
Refer to the MAX86176 data sheet for more details on both
methods.
This option configures the measurement to only collect
ambient light PPG samples with the LED drivers disabled.
Enables the SINC3 decimation filter for the delta-sigma PPG
ADC. This filter provides improved high-frequency roll-off that
improves the high-frequency ambient-light rejection. By
default, the device uses a third order COI3 filter. This filter is
only available with an integration time setting of 117.1µs.
This option configures the order of decimation filter, second
and third order. This second order filter is only available
when the SINC3 filter is disabled, and integration time is
117.0µs. Enabling this feature also results in an actual
integration time of 118.2µs.
ECG Channel Tab
This tab offers a high-level overview of the ECG channel configuration options, and allows for
configuration of the input amplifier gains, fast recovery modes, ADC samples rate, and software filters.
Software ECG Filter is shown on ECG signals in the GUI plots as well as saved in a separate file log
ending in ‘.ecg_filtered.csv’. See the table configuration options in Table 7 for more details.
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