Power detection circuit, portable device and method for preventing data loss
A portable device, power detection technology, applied in power testing, electrical components, electronic switches and other directions, can solve problems such as inconvenience
Inactive Publication Date: 2010-12-22
GENERALPLUS TECH INC
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Problems solved by technology
cause inconvenience
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[0050] figure 2 is a system circuit block diagram of the portable device according to the first embodiment of the present invention. Please refer to figure 2 , the portable device includes a power input terminal 201, a functional block 202, an SRAM 203, a microprocessor 204, and a power detection circuit 205 according to an embodiment of the present invention. The power detection circuit 205 includes a data lock circuit 2051 , a discharge unit 2052 and a switch circuit 2053 . In order to allow those skilled in the art to implement the embodiments of the present invention according to the spirit of the present invention, hereby figure 2 In addition, the capacitor C201, the power detection signal SRC_DET, the power low signal SRC_LOSS, the battery voltage VSRC, the internal power voltage VKEEP and the common voltage VSS are additionally shown. The above-mentioned functional blocks 202 , SRAM 203 and microprocessor 204 are powered by the internal power supply voltage VKEEP....
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The invention provides a power detection circuit, a portable device and a method for preventing data loss. The power detection circuit comprises a data locking circuit, a discharging unit and a switching circuit, wherein the data locking circuit is used for receiving the voltage input by a power input end; the discharging unit is coupled between the power input end and the common receiving voltage to determine whether the first end and the second end thereof are short-circuited or not according to whether power detection signals are enabled or not; and the switching circuit is coupled betweenthe power input end and the internal circuit of the portable device. During a testing period, when power detection signals are enabled, the first end and the second end of the switching circuit are open-circuited. In the testing period, if power low signals which are received by the switching circuit and are output by the data locking circuit are converted from a first state into a second state, the open-circuited state of the first end and the second end of the switching circuit is kept. In the invention, a combinational logic circuit is used for detecting the external power voltage input bybatteries, and a capacitor can be used for keeping data stored in a register or / and a random access memory for a long time.
Description
technical field [0001] The present invention relates to a battery power detection circuit of a portable device. More specifically, the present invention relates to a power detection circuit, a portable device and a method for preventing data loss. Background technique [0002] With the advancement of science and technology, electronic technology has progressed from the earliest vacuum tubes and transistors to integrated circuit chips. Its uses are very extensive, and therefore, electronic products have gradually become an indispensable daily necessities in modern life. Many items have gradually been digitized. The purpose of electronization is nothing more than to make it convenient for people to use. Whether the power supply exists or not determines whether the entire system can work normally. Especially portable devices that utilize batteries as a power source. [0003] In the past portable devices, the low voltage detection is often used to determine whether the power...
Claims
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IPC IPC(8): G01R31/40H03K17/72
Inventor 蔡明宏李新洲
Owner GENERALPLUS TECH INC