Circuit design in supercapacitor in RAM data protection

Faraday capacitors are also super capacitors. The supercapacitor is a new type of energy storage device between the traditional capacitor and the rechargeable battery, with a capacity of several hundred to thousands of fifts, compared to the traditional capacitor: it has a large capacity, high energy, wider The operating temperature range and the long service life; and compared to the battery: it has a higher specific power, and there is no pollution to the environment, so that the supercapacitor is an efficient, practical, environmentally friendly energy storage device. . The capacity of the flats is much larger than the usual capacitors. Since its capacity is large, the external performance and the battery are also known as "capacitive batteries". The Farace capacitor belongs to a dual layer capacitor. It is one of the world's largest capacity in the world, the basic principle and other types of two-layer capacitors are used to consist of activated carbon porous electrodes and electrolytes. The two-layer layer structure obtains a large capacity. Application of Fara Capacitor in RAM Data Protection When the power is normal, the 5 V power supply VCC powers the RAM (U2: UT6264) by the fast rectifier diode D1, and charging the Farace capacitor (C1: FM0H104Z) via the R1. When the power is powered down, the D1 is closed, the Faraday capacitor C1 is used as a backup power source, powered by R1 to U2, and ensure that the data in the RAM does not disappear. In the power-down process or when the power is fluctuated, in order to enhance the security of the RAM data, a dedicated power monitoring chip (U3: IMP706) is used, and the monitoring function of the system is provided. Power, power-down and grid voltage will output the reset signal while tracking 1.6 S timing signals, providing a Watchdog Timer Protection for software. When the power supply voltage is dropped to about 4.74 V, the U3 outputs the power-down signal (PW_DN) to the CPU (U1: AT89S52), and the CPU performs power-off emergency processing and protection site, and no reading and writing will be performed to the RAM chip. When the power supply voltage is further dropped to 4.4 V, the U3 generates a reset signal, the CPU is reset, and the chip select pin CE2 of the RAM chip U2 is also set low to ensure that the U2 is not read or written. Be Article source network

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