| 摘要 |
A power-off protection circuit includes a power-off detection module and a delay module. The power-off detection module is connected to a system power port of an electronic device and determines when the system power port is at a low voltage, as an indication that the electronic device is being powered off. A power-off signal is produced when the system power port is at a low voltage. The delay module transmits the voltage from the system power port to a processing unit and an EEPROM when the electronic device is powered on, and provides a voltage to the processing unit and the EEPROM for a period of time when the electronic device is powered off, allowing the processing unit and the EEPROM to continue working for the period of time, thus enabling the processing unit controls to store parameters set but not yet stored by a user into the EEPROM.
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