Portable information terminal with radio communication device in it
A technology of wireless communication device and information terminal, which is applied in the directions of wireless communication, telephone communication, circuit device, etc., can solve the problems of shortening the operation time of information device a and the like
Inactive Publication Date: 2003-12-17
PANASONIC CORP
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Problems solved by technology
However, this method also poses a problem in that the operating time of the information device a is shortened
Method used
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Embodiment Construction
[0022] The first embodiment of the present invention is directed to a portable information terminal with a built-in wireless communication device having the following functions: when the wireless communication unit is in the sending state, the information processing unit and the interface are deactivated; when the wireless communication unit When in the non-transmitting state, start the information processing unit and the interface; and, when the wireless communication unit is in the voice communication state and no information is input to the information processing unit within a given time period, make the information processing unit and the interface unit quit working.
[0023] figure 1 It is a portable information terminal a' (hereinafter simply referred to as "terminal a") having a built-in wireless communication device according to the first embodiment of the present invention. The terminal a' includes a wireless communication unit a2, an interface a3, an information pro...
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There is provided a portable information terminal having a built-in radio communications device which minimizes a drop in the voltage of a battery and diminishes the operation threshold voltage of the portable information terminal, thereby lengthening the operatable time of the terminal. In the portable information terminal, when a radio communications section is in a transmission state, a microprocessor of an interface and a microprocessor of an information processing section are brought into a hold state, thereby deactivating the interface and the information processing section. As a result, the operating current required during transmission can be minimized. When the radio communications section is not in a transmission state, the information processing section and the interface are activated. Even when the radio communications section is in a voice communication state and when information is not input to the information processing section for a given period of time, the information processing section and the interface are deactivated. A voltage drop due to internal resistance of the battery is diminished by distributing or reducing the electric current dissipated by operation, in accordance with operating conditions. Consequently, the portable information device can be operated even when the voltage of the battery drops, thus lengthening the operatable time.
Description
technical field [0001] The present invention relates to a portable information terminal having a built-in wireless communication device, particularly a portable information terminal having a built-in wireless communication device such as a portable cellular phone. Background technique [0002] image 3 The structure of a general portable information terminal having a built-in wireless communication device is shown. The ordinary portable information device a with built-in wireless communication device (hereinafter referred to as "information device a") includes: a wireless communication unit a2, an interface unit a3, an information processing unit a4, and a storage battery a8. The wireless communication unit a2 has a TDMA (time division multiple access, time division multiple access) type wireless communication device for transmitting and receiving data using time division technology. The wireless communication unit a2 transmits and receives data via the antenna a1, and the ...
Claims
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IPC IPC(8): H02J7/00H04B1/16H04B7/26H04M1/00H04M1/21H04M1/73H04W52/02
CPCH04W52/0274H04B1/1615Y02B60/50Y02D30/70
Inventor 村松文浩杉原隆史
Owner PANASONIC CORP