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RTC boasts low current drain, wide operating range

Posted: 28 Oct 2009 ?? ?Print Version ?Bookmark and Share

Keywords:real time clock? RTC? capacitor?

RV-2123-C2 RTC

Tailored for applications requiring ultralow power consumption, Micro Crystal has launched a SMD package real time clock (RTC) that typically draws just 130nA @ 3V. The RV-2123-C2 is suitable for compact portable devices, especially where a super capacitor is used for backup supply operation. Its ultrawide 1.1V to 5.5V operating range provides added flexibility. Communications with other circuitry is simplified by an SPI-Bus (SCL up to 8MHz @ 5V).

The SON 10-pin ceramic package contains a built-in 32.768kHz Tuning Fork crystal, matched with a CMOS-based oscillator and real-time-clock circuitry. At room temperature, frequency and time keeping is within 10ppm or within 20ppm @ 25C. A user programmable Frequency Offset Compensation Register can be used to improve time accuracy. Aging rate is at a maximum of 3ppm for the first year.

The clock function tracks minutes and seconds either in 24-hour or in 12-hour AM/PM format. Programmable alarm setting and universal timer functions further increase flexibility. A calendar function provides year, month, date, and day-of-the-week, with built-in century and leap-year flags.

Moreover, the RV-2123-C2 offers open-drain interrupt and programmable clock output for peripherals devices (32.768kHz down to 1Hz).

Because it is entirely self-contained, the RV-2123-C2 is a simple solution that can save engineering, procurement and inventory costs. External dimensions of the standard ceramic package are 5mm x 3.2mm x 1.2mm. Like all Micro Crystal products, it is RoHS-compliant and 100 percent Pb-free.

Micro Crystal's RV-2123-C2 RTC is available in production quantities, with 10 to 12 week delivery. In 10,000-piece lots, it is priced at under $1.80 each.

Potential applications are widespread, including: battery powered handheld devices, portable point of sales terminals, GPS, digital still cameras, glucose meters, security systems, appliances, factory automation, programmable logic control and data loggers.

- Henri Arnold
EE Times Europe





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