Application of GPS in ringing controller
Tan Bao-cheng · Electronic Design Engineering · 2011
Auto-timing ringing controller is designed based on GPS OEM module and SCM minimal system.MCU got the Greenwich time from E531 module.Then converted the time to Beijing time by adjusting the time zone.And the Beijing time calibrated the local chip DS1302.The controller based on the time of satellite when the GPS satellite signals received or the time of local chip when the GPS module can not receive satellite signals.In this way,it maintaines the accuracy of the controller's time and ensures the continuity of it's work.