[原创]Maxim MAX31331超低功耗I2C实时时钟和功率管理方案

Maxim公司的MAX31331是超低功耗I2C实时时钟(RTC)时间保持器件,正常消耗65nA时间保持电流.支持各种范围32.768kHz晶体.可以使用有任何电容负载(CL)的晶体,加宽了器件可用晶体的品种.器件通过I2C串行接口进行访问.器件还具有备份电源引脚(VBAT),当主电源(VCC)下降到可编阈值电压以下时,能自动切换到备份电源(VBAT).其它特性还包括两个当日时间告警,中断输出,可编方波输出,具有时间戳的事件检测输入,以及其串行总线暂停机制.32位时间戳寄存器加倍了RAM存储.器件具有数字施密特触发器输入(DIN),能用来记录时间和/或产生和中断DIN信号的下降/上升沿.时钟/年历提供秒,分,小时,天,月,年和日期信息.1/128秒寄存器可用作亚秒时间戳的分辨率.月底的日期,小于31天的月份能自动调整,包括闰年的修正.时钟产生24小时/12小时格式.主要用在医疗设备,可穿戴,手持仪器,远程信息处理,工业和IOT.本文介绍了MAX31331主要优势和特性, 简化框图, 典型应用电路图以及评估板MAX31331 EVK主要特性,电路图,材清单和PCB设计图.

 The MAX31331 ultra-low power, real-time clock (RTC) is a time-keeping device that consumes nominal 65nA timekeeping current, extending battery life. The MAX31331 supports a wide range of 32.768kHz crystals. A crystal with any capacitive loading (CL) spec can be used, which broadens the pool of usable crystals for this device. This device is accessed through an I2C serial interface.

The device also features a backup supply pin (VBAT) and automatically switches over to the backup supply (VBAT) when the main supply (VCC) drops below the programmed threshold voltage and the backup supply (VBAT) voltage.

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