For example, when we assume, that the lithium ion battery which is loaded onto PSP is 6.5Wh 8 hour drives are actualized, average electric power consumption of the whole system must be held down to 800mW. Assuming, that the battery was designated as 10Wh, as for electric power consumption of 8 hour drives 1.25W. When of weight is thought, perhaps this is the limit. In case of PSP, because electric power is eaten even with liquid crystal display and optical disk "UMD" drive, as for electric power consumption of the tip/chip it is necessary to hold down to very limit.
Though, the economical electrical technology itself which has been adopted with PSP that much is not special ones. First, with the PSP tip/chip, by the fact that clock supply is controlled in clock gating, electric power is held down. Logic on the tip/chip, several parts (the island) you divide, stopping the clock to the island which has not been utilized, wasteful electricity consumption that try it does not occur.
In addition, with PSP, the electric power supply which is separated into 3 large units of 3D graphic unit, H.264 decoder unit and AVE unit, respectively is done. In every unit, by the fact that electric power supply is shut down completely, wastefulness is excluded.
Those where it is fortunate for PSP multi uses from the quality, multimedia device, are that cannot be a case where private unit is used entirely simultaneously almost. For example, it does not do H.264 video playback on the midst when you have played the 3D game. Conversely, while seeing video, it is possible to make the game engine stop.
In addition, also scalability of voltage of the PSP tip/chip made clear. As for the PSP tip/chip the CPU core is operational 333MHz and other blocks with 166MHz. These frequencies with peak, can drop to 0.5 - 1MHz scalable. In that case, you say that also core voltage can lower to lowest 0.8V.
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