意法半导体串行实时时钟的应用范围从便携式应用的超低功耗设备到具有模拟校准功能的高精度部件，再到具有嵌入式晶体的工厂校准RTC模块。
SRAM管理器功能可利用RTC的备用电源将标准易失性SRAM转换为非易失性的存储器。可编程看门狗、早期电源故障报警电路和上电复位/低压检测功能等附加功能为主MCU的运行提供了支持。具有重复模式的可编程报警可用于备用电池操作。
带晶体选件的电池
意法半导体的可移动/可替换SNAPHAT®电池顶部包含一个纽扣锂电池和32 kHz晶体。与意法半导体的表面装配型SOH-28和SOH-44封装的所有串行和并行接口实时时钟兼容。
SNAPHAT的顶部设计为将SOIC表面装配在PC板上之后“卡入”，以防电池和晶体暴露于表面安装过程的高温下。
要评估电池容量消耗及寿命，请访问实时时钟电池寿命计算网页。
另外提供了用于我们串行RTC接口的C代码示例。
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Real-time clock for demanding wearable devices
ST’s M41T62LC6F real-time clock is the perfect match for wearable devices when size, weight, and power-efficiency matters.
It offers a very low frequency error at 25 °C which equates to about 5 seconds per month, an ultra-low power consumption of 350 nA in standby, and comes in an ultra-small 1.5 x 3.2 mm package with an embedded crystal oscillator.
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M41T82
Serial I²C bus real-time clock (RTC) with battery switchover
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M41T0
Serial real-time clock (RTC)
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M41T93
Serial SPI bus real-time clock (RTC) with battery switchover
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M41T66
Serial real-time clock (RTC) with alarm
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M41T64
Low-power serial real-time clock (RTC) with alarm
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M41T83
Serial I²C bus real-time clock (RTC) with battery switchover
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M41ST87W
5.0 V, 3.3/3.0 V secure real-time clock , NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
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M41T81
Serial real-time clock (RTC) with alarm
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M41T94
Serial real-time clock (RTC) with 44 bytes NVRAM and reset
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M41T56
Serial real-time clock (RTC) with 56 bytes NVRAM
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M41T80
Serial real-time clock (RTC) with alarm
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M41T00
Serial real-time clock (RTC)
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M41T00AUD
Serial real-time clock (RTC) with audio
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M41T11
Serial real-time clock (RTC) with 56 bytes of NVRAM
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M41ST85W
3.0/3.3 V I²C combination real-time clock, NVRAM supervisor and microprocessor supervisor
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M41T81S
Serial real-time clock (RTC) with alarm
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M41T60
Low power serial real-time clock (RTC)
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M41T00S
Serial real-time clock (RTC)
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M41T01
Serial real-time clock (RTC) with built-in battery switchover circuit
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M41T62
Low-power serial real-time clock (RTC) with alarm
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M41T65
Low-power serial real-time clock (RTC) with alarm
