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1 Architecture
A typical health-sensing design includes a host microcontroller communicating with the
MAX32664C through the I 2 C bus. Two GPIO pins are needed to control the reset and the startup
in Application or Bootloader mode through the RSTN and multifunction I/O (MFIO) pins. An MFIO
pin is also used in Application mode to interrupt the host for I 2 C communication. The MAX32664C
interfaces to the MAX86141 optical sensor through the SPI bus.
An accelerometer is mandatory for heart-rate monitoring. A KX122 accelerometer can be
connected directly to the MAX32664C. Alternatively, an external 3-axis host-side accelerometer
can be used. In this case, the host needs to periodically provide accelerometer readings to sensor-
hub using the commands provided in this document. For more information, see the MAX32664
User Guide .
Figure 1. Architecture diagram for health-sensing applications.