The functions that the meter rate system needs to accomplish are as follows:
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Receiving the user purchase information sent by the handheld unit; combining the newly received user purchase information with the own user power consumption information of the rate system to obtain new information; dynamically calculating to obtain the remaining power to remind the user Purchase electricity and cut off the power when the excess electricity reaches a certain value.
The circuit principle of the meter rate system: 
Among them, PHILIPS SEMICONDUCTORS's cost-effective single-chip P87LPC764 is the main device to complete this part of the function. The single-chip microcomputer P87LPC764 comes with an internal 6MHz RC oscillator, internal watchdog circuit and internal reset circuit, which has strong anti-electromagnetic interference capability and small operating current.
The PCF8583 is a clock/calendar chip with 240 x 8-bit RAM from PHILIPS SEMICONDUCUORS. Used to provide time information, the power supply company implements a time-of-use tariff strategy. It can store 4 years of calendar time information, and can also be programmed to set its calendar time information function.
CAT24WC02 is a true 0 power EEPROM chip with I2C bus interface and 1 million erase and write life.
April 08, 2023