Battery powered wearables and fitness devices are typically very compact in size and have limited battery capacities. These devices must use high efficiency power conversion to maximize user time between charging cycles. Internal load circuit switching and input power port protection are required to connect to battery charging devices.
Buck and Boost Converters
Wearable and fitness devices operate from small, limited capacity, battery cells with a voltage level that varies based on their state of charge.
Most application circuits within a wearable device operate at a voltage level lower than that of the battery
To conserve power and maximize battery operation between charges, small, high efficiency DC-DC voltage step-down converters are recommended to supply the required regulated voltage rails
High efficiency DC-DC switching step-down regulators can provide the solution
Kinetic Technologies’ general-purpose input/output (GPIO) technology is low voltage and offers general purpose expanders designed for microcontrollers when additional I/Os are needed, ensuring additional interconnections are kept to a minimum.
As an input, the expander programs the polarity, latch, pull-up, pull-down and interrupt functions. For a system with noisy input, our GPIO technology also provides a seamless debounce function with programmable debounce time. Working as an output, this technology can program output stage with bank/pin selectable push-pull or open-drain options, and can also program four drive strengths of the output stage to optimize rise/fall times.
GPIO technology is the perfect fit for wearables and fitness technology.
Battery powered portable platforms require switches to protect external input power ports used for operation and battery charging and to control internal load circuits.
Input power port protection is a paramount concern in wearables and fitness design, as reliable power sources may not always be used.
Over-voltage, and surge protected load switches protect battery charge management and operating handset circuits, by breaking the connection between the power source and the internal circuitry, in the event the device is connected to a faulty power source or subjected to an abnormal stress condition.
Programmable and fixed over-voltage protection (OVP) shutdown thresholds.
Wrong adapter up to +40V
Reverse voltage down to -6V
Transient voltage protection up to 200V, compliant to IEC61000-4-2 (Level 4)
ESD protection compliant to ±8kV contact, ±15kV air gap and ±2kV human body model.
Single or dual devices with Uni or Bi-directional blocking
The compact nature of wearables and fitness devices leave very little room for discrete and associated passive components. Integrated load switches provide internal power switching and are controlled by simple GPIO logic.
Eliminate the need for bias and level shift circuits associated with discrete MOSFET switches
Provides slew-rate limited turn-on with reverse current blocking and output discharge mode to de-select functions when not required to extend battery life.