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| OPPHO Electronics Co., Ltd Add:Building G1, Dongke Industrial Par, Nanpu Village, Changping Town, Dongguan City, Guangdong Province Tel:86-769-83393855/83397855 Fax:86-769-83398055 Contact:Mr.Zhou/13925568556 E-mail:sales@oppho.com Website:www.oppho.com |
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TACT switch off automatically after a mains failure, once again will not automatically turned on when a call (press the control buttons needed to get through), you can avoid long-term power while consuming electrical energy or cause an accident. Boot it works: When the system is turned off, the light touch switch is pressed, PMOS transistor Q1 gate voltage by a 9V battery voltage by R1, R3 partial pressure changes from the original 9V 4.5V, and Q1's source voltage is 9V input, Vgs = Vg-Vs = 4.5-9 =-4.5V, Q1 thus turned on so that approximate equal to the input supply voltage Vin, Vin and then through the back of the LDO or DC-DC power supply chip transformed into the system required power supply voltage VDD, the product behind the system begins to operate. TACT Switch Switcher system has a simple circuit, low cost, easy to operate, less software code, shutdown and low power consumption, can be easily integrated into the PSoC portable electronic products to achieve low system power consumption purposes. |
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