How do I set the sample rate for SpO2 measurements in multi-LED mode for the MAX30101?
You do this in the same way as the other modes. This is because in multi-LED mode, a sample consists of three slots, one for each LED. To set the sample rate, the user has to write to the bits [4:2] of the SpO2 Configuration register with address 0x0Ah. Table 6 in the datasheet lists the available samples-per-second configurations.