QO270R is a power management chip with multiple functions. Its pin functions include input power supply, output power control, system reset, battery management, temperature monitoring and communication interface. Specifically, pins 1 and 2 are input power supply pins, pin 3 is output power control pin, pin 4 is system reset pin, pin 5 is battery management pin, pin 6 is temperature monitoring pin, and pin 7 is communication interface pin. Through these pins, the QO270R can achieve power management and monitoring, ensuring stable system operation and extending battery life.