Maxim MAX31328±3.5ppm I2C实时时钟(RTC)解决方案

Maxim公司的MAX31328是低成本极为精确(±3.5ppm)的I2C实时时钟(RTC),并集成了温度补偿晶体振荡器(TCXO)和晶体.器件采用电池输入,在设备主电源断电后能保持高精度计时.RTC维持秒,分,时,日,月和年的信息.当月小于31天时,月终的日期能自动进行到底调整,包括闰年的修正.时钟工作在24小时或带有AM/PM指示的12小时格式.提供可编程的日闹钟和可编方波输出.地址和数据通过I2C双向总线串行进行传输.精密的温度补偿的电压基准和比较器电路监视VCC状态,检测电源的失效时并能自动切换到备份电源,如果有必要.工作温度-40C 到 +85C,工作电压2.3V到5.5V,计时电池的电流为660 nA,2C接口工作频率400kHz.主要用在服务器,电表,GPS和远程信息处理.本文介绍了MAX31328主要优势和特性,简化框图,典型应用电路图以及评估板MAX31328 EVK主要特性,电路图,材料清单和PCB设计图.

The MAX31328 is a low-cost, extremely accurate, I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device and eliminates the external crystal requirement in the system. The MAX31328 is available in a 10-pin LGA package.

The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format with an AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures and automatically switch to the backup supply when necessary. Additionally, the RST̅̅̅̅̅ pin ismonitored as a pushbutton input for generating a microprocessor reset.

MAX31...