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ST launches smallest RTC IC

Posted: 29 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:RTC IC? oscillator crystal? oscillator failure detection?

STMicroelectronics Inc. has launched a small combined crystal and real-time clock (RTC) IC for time, calendar and alarm functions that targets battery-powered designs. ST combined the world's smallest RTC die and a matched oscillator crystal in the same package size as the smallest crystal-only device on the market. The result is what ST claims as the world's smallest integrated RTC/crystal. It measures 3.2 x 1.5mm and offers ultra-low power consumption, the company said.

By operating at low voltages from 1.3C4.4V and drawing only 350nA, the M41T62 can be driven directly from a Li-ion battery. Many integrated MCUs have an on-chip RTC, but these often provide limited features and an external crystal is always required. Unlike designing with MCUs, or discrete solutions, the IC takes care of the required and sometimes troublesome matching of the crystal and the RTC.

The M41T62 also simplifies product design by producing a stable 32kHz signal on start-up that ensures reliable starting for many of today's processors and subsystems such as Bluetooth modules. Additional features that enhance design and system performance include oscillator failure detection (OFD) that helps the system detect power faults. Actions such as power-down time stamping, low-battery detection can be done without the additional external components needed by a MCU RTC. The device is also UL certified and has a built-in reverse diode.

The RTC IC improves the performance of systems whose functions rely on data logging, time stamping, interval monitoring or synchronization. These can be found in SLR digital cameras, GPS receivers, portable multimedia players, card readers and portable medical monitors such as glucose meters.

The M41T62 is entering into volume production in LCC8 leadless package, priced at approximately $1.50 in quantities of 1000 units. Alternative pricing options are available for larger order quantities.

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