This part of IEC 62282 covers interchangeability of power and data between micro fuel cell power systems and electronic devices to provide the micro fuel cell power system compatibility for a variety of electronic devices while maintaining the safety and performance of micro fuel cell system. For this purpose, the standard covers power interfaces and its connector configuration. The power management circuitry and power sharing methodology are also provided. This standard also covers data communication protocol and its data specification. Operation modes and alerts conditions are also provided for the means to comply with the power control requirements of electronic device. A micro fuel cell power system and micro fuel cell power units block diagram is shown in Figure 1. Micro fuel cell power systems and micro fuel cell power units are defined as those wearable or easily carried by hand, providing d.c. outputs that do not exceed 60 V d.c. and power outputs that do not exceed 240 VA. This standard covers the power and data interfaces between the micro fuel cell power unit and electronic device. Figure 1 Micro fuel cell power system and micro fuel cell power unit block diagram