关键词: 实时钟电路, 时间记录, 温度补偿振荡器, 石英晶体振荡器

Abstract: The paper presents a temperature compensated crystal oscillator (TCXO) with high accuracy in 0.35μm CMOS EEPROM process. The crystal, temperature sensor and RTC, together with the automatic compensation algorithm, are all integrated into a single package. Very accurate (±5×10-6) timekeeping is obtained over a wide range of temperatures from -40 to 85℃, In addition to providing date and time (seconds, minutes, hours, day-of-week, day of month, month and year), the device also provides alarm function, fixed-cycle timer, time update interrupt and programmable frequency outputs (1 Hz, 1 kHz and 32 kHz).

Key words: RTC, timekeeping, DPCO, crystal