RTC - Serial Interface

ST's serial real-time clocks range from ultralow power devices for portable applications to high-accuracy parts with analog calibration. The product family also offers factory calibrated RTC modules with an embedded crystal.

High-end RTCs offer no compromise on performance and functionalities. They combine low standby current and high-end features such as tamper detection with timestamp and watchdog SRAM supervisor functions to meet all high-end applications requirements.

ST's removable/replaceable SNAPHAT battery top contains a lithium coin-cell battery and a 32-kHz crystal. It is compatible with all ST's serial and parallel-interface real-time clocks in surface-mount SOH-28 and SOH-44 packages.

The SNAPHAT top is designed to be "snapped on" after the SOIC is surface-mounted on the PC board, preventing the battery and crystal from being exposed to the high temperatures of the surface mount process.

To evaluate the battery consumption capacity and lifetime, visit the real-time clock battery life calculation webpage.
C code examples for interfacing with our serial RTCs are also available.

Applications

Home and Professional Appliances

GNSS/GPS

Bridge and Gateway

Product types

High-end RTCs offer no compromise on performance and features combining low standby current and high-end features such as, tamper detection with timestamp and watchdog SRAM supervisor functions to meet all high-end applications requirements.

For high accuracy timekeeping, the crystal product line is the perfect choice thanks to the factory calibrated oscillator which is down to +/-5 ppm. The crystal embedded in the package further improves the oscillator noise immunity, which is not impacted by PCB traces connections.

In addition, SNAPHAT top, which embeds both crystal and the battery, together with SOH-28 packaged RTCs delivers higher benefits.

The basic product line offers industry standard SO-8 package for ease-of-use and compatibility.

Discover our portfolio of Serial Interface RTC