实时时钟（RTC）IC

ST offers the widest portfolio of real-time clock (RTC) ICs including ultra-low-power devices, the worlds smallest package with embedded crystal, and STs SNAPHAT with battery and crystal integrated.  It supports SPI and I2C buses.

Supervisory functions include alarm, battery switchover, reset, and special features with time stamp, anti-tamper for secure applications, audio, and trickle charge.

To make designing with real-time clock ICs even easier, ST offers two simulators:

Battery life calculation allows to evaluate the battery capacity consumption and lifetime of STs real-time clock ICs

Clock calibration calculator demonstrates the digital calibration feature of RTC ICs