Why is the VLED+ voltage on the MAX30102ACCEVKIT at 4.4V?

The allowable range of the voltage V_LED changes the LED current supply headroom. This allows the user to customize the design for a current range to best fit their application and to stay within a target power consumption range. The current through the IR and Red LEDs is controlled by the registers listed in Table 8 in page 20 of the MAX30102 datasheet.

Is there Software for the MAX30102ACCEVKIT that runs on Mac OS?

Unfortunately Maxim does not have software for the MAX30102ACCEVKIT which runs on Apple devices. The MAX30102 can be evaluated on its own on an Apple device by using the MAXREFDES117# in conjunction with an Arduino UNO however.

When I use the MAX30102EVKIT software, it crashes due to a pba.dll error. How do I fix this?

Please look at the installation directory of MAX30102EVKIT and see if PBA.dll is stored in the directory. If it missing, please uninstall and reinstall the software package.

Why is the MAX30101_xxxxx.csv missing HR and SpO2 samples when using the eval kit GUI?

Please ignore the MAX30101_xxxxx.csv file as the data in this file is incomplete. There is currently no schedule as to when this will be fixed. Instead, please use the dataset from MAX30101_xxxx_PPG.csv and MAX30101_xxxx_XYZ.csv. SpO2 and heart rate can be calculated by post processing the PPG log in the csv files. This also works with the MAX30102 evaluation kit.

Why is the message "HR/SPO2 only valid for Fs=100Sps" displayed in the MAX30102ACCEVKIT GUI?

Even though the MAX30102 datasheet says that other sampling rates can be selected for the part, the MAX30102ACCEVKIT GUI displays the message "HR/SPO2 only valid for Fs=100Sps" due to the internal algorithms written for the device to calculate heart rate (HR) and peripheral capillary oxygen saturation (SpO2). They require a sampling rate of 100Sps. This does not reflect the capability of the device itself. Also, customers can still log the PPG samples using the evaluation kit.

What is the difference between the MAX30101ACCEVKIT# and MAX30102ACCEVKIT#?

They are evaluation kits for MAX30101 and MAX30102 respectively. MAX30101 is very similar to MAX30102 with pin-to-pin and register compatibility. The main difference is that there are 3 LEDs in the MAX30101: red, green, and IR; while there are only 2 LEDs in the MAX30102: red and IR. Green LED is mainly for heart rate measurement for wrist. The PPG signal using green LED on wrist has higher signal to noise ratio and is more susceptible to motion artifacts.

What Prevents "USB HID Report Timeout" Errors with the MAX30102ACCEVKIT?

See below for a screenshot of the MAX30102ACCEVKIT# software GUI's error prompt with the text "USB HID report timeout; no interrupt? Board power? I2C connection?" This error is typically due to incorrect connection of the flexible cable between the microcontroller board and the sensor. Here are two photographs showing proper orientation: The customer should carefully reconnect the two boards with the flexible ribbon cable, keeping in mind two things: 1) A little more force than originally expected may be required to get the cable into the connectors to where they make good electrical connection. 2) The cabling is small, and thus it is very easy to connect to the boards incorrectly -- such as attaching the cable at an angle, upside down, or not all the way in, etc. These conditions generate the above USB HID errors specifically when the GUI has found the microcontroller but is unable to communicate with the sensor.