The personal healthcare device class encompasses devices that help to maintain health and wellness, manage disease, and enable independent living for the elderly.Devices in the class include heart-rate and blood-pressure monitors, glucose meters, pulse oximeters, motion sensors, and pill monitors.

The class doesn’t define protocols for data or messaging. Devices may use data and messaging standards defined in the ISO/IEEE 11073-20601 Base Exchange Protocol. A device may send data that is episodic (at irregular or infrequent intervals) or continuous. A device may collect and store data before transmitting the data to the host, and a device may collect data when detached from the host. For example, a jogger might wear a monitor while out for a run and upload the data on returning home. Devices may support host-to-device communications to receive configuration data and other episodic data from a host.

The preferred location for the class code is in the interface descriptor, but declaring the class in the device descriptor is allowed. The function must have at least one bulk endpoint in each direction. An interrupt IN endpoint and additional endpoints are optional.

Several class-specific descriptors provide class-specific information. A PHDC
Class Function descriptor specifies the device’s data and messaging protocols. If needed, a Function Extension descriptor follows the PHDC Class Function descriptor. Following each endpoint descriptor is a PHDC QoS descriptor with attributes that describe the latency and reliability of the data channel. If needed, a PHDC MetaData descriptor follows the PHDC QoS descriptor to provide application-specific information.

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