Analog Devices MAXREFDES106#

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MAXREFDES106# Health Sensor Platform 4.0
Available Options
Table 5. PPG Settings Configuration Options
Sub-Section
Option
Description
Frame Rate Settings
Frame Rate Clock
Displays the MAX86178 internal oscillator to use as the
clock source for the PPG frame rate.
Desired Frame Rate
Sets the desired frame rate of the PPG AFE. Enter a
target value and then hit ‘Enter’ to have the GUI
calculate and set the correct clock divisor for this target
value. Any value up to 2048 can be set here. (Due to
BLE bandwidth limitations, not all frame rates are
supported.)
Actual Frame Rate
Actual frame rate of the PPG AFE. Due to rounding from
the clock divisor, ‘Desired Frame Rate’ and ‘Actual
Frame Rate’ may differ slightly.
Clock Divisor
Displays the calculated clock divisor for the ‘Desired
Frame Rate’.
System Control
PPG1 Power Down
PPG2 Power Down
Checking this box powers down the corresponding PPG
channel to save power. At least one channel should
remain enabled during measurements.
Photodiode Bias
PD1/PD2/PD3/PD4
Sets the photodiode bias for each photodiode. There are
three available biasing options to support a larger range
of PD capacitances, allowing different PDs to be used.
For the MAXREFDES106# photodiodes, the 0pF to
125pF range should be used, as the PDs used have a
capacitance of 47nF typical. See the ‘Photodiode
Biasing’ section of the MAX86180 datasheet for more
details.
Accelerometer
Configuration
Accelerometer
Enables or disables the onboard accelerometer.
Note: When enabling the ‘Algo Hub’ mode, the
accelerometer is automatically enabled.
Full-Scale Range
Sets the output scale of the accelerometer data.
PPG Measurement Settings
This tab offers in-depth manual control of the PPG AFE. Individual measurement blocks can be enabled,
configured, and sequenced here. The layout of the LEDs and PDs on the MAXREFDES106# is provided
for reference in Figure 55.