The description of MAX86150 register 0x0F is different between the datasheet and the MAX86150EVSYS GUI :
a) in datasheet just bit0 - bit3 are available; b) in register map bit7 is available FOR FUNCTION "ALC-FDM disable"; c) in application note 6843 from the website, bit4 is available.
This is tricky. Basically, this is guiding the users to go into a special mode to enable the ECG to function as it is described in the datasheet (100M ohm input impedance with lead bias). The individual registers are not describable and should be treated as a group. We simply ask that users follow our guidance and set this upon device power up to ensure best ECG quality. This is purposely omitted in the datasheet. When users set registers accordingly during “configuration” of the device, POR will reset the registers and require the users to re-write these overpower cycle.