AT89C51ED2 also contains a programmable timer array and a 1792-byte XRAM, hardware watchdog timer, SPI interface, keyboard interrupt, as well as a more general-purpose serial interface to facilitate multi-processor communication (EUART) and acceleration mechanism (X2 Mode).The AT89C51ED2 the Fully static design reduces system power consumption, it allows the clock frequency down to any value (including DC), and will not result in data loss. AT89C51ED2 two software selectable operating modes 8 clock divider active, it can be reduced further reduce power consumption. In idle mode, the CPU is frozen, peripherals and interrupt system to continue to work. While in power-down mode, RAM contents are saved and all other functions are invalid. The AD590 is a 2-port integrated temperature sensor, it can produce output current proportional to absolute temperature. 1µA / K ratio in the range of 4 ~ 30 V supply voltage, AD590, can be used as a high impedance constant current regulator. AD590 can be used for temperature sensing applications at 150 ° C or less, which is the current conventional working range of the electronic temperature sensor. Generic low-cost laptop battery monolithic integrated circuit, and without external support circuitry makes the AD590 the most attractive options for many temperature measurement occasions. In addition, the linear circuit, a precision voltage amplifier, a thermal resistance measuring circuit, and a cold junction compensation circuit, the AD590 applications no longer need. The AD590 characteristics are as follows: 3 Software Design 3.1 overall process Power On, the first by the main program of the microcontroller and GSM module initialization. The MCU initialization, including the work of set the serial port, baud rate, and initialize the variable parameters and flags. GSM module initialization restart, turn off the echo, the return value is not set in TEXT mode to display detailed information about the head, notebook battery select SMS format to TEXT mode, Dell Inspiron 1525 battery open the serial port interrupt is ready to receive data, and then start the ADC acquisition temperature data, and then the processing of the data, and finally determines whether the alarm. The overall system software flow is shown in Figure 3.
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