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Real-time clocks offer event detect, time stamp features

Posted: 04 Sep 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? ISL1219? ISL1221? real-time clocks? clocks?

Intersil introduces the ISL1219/21 real-time clocks suited for time stamping single events such as the moment a warranty is voided by the removal of a cover, or recurring events such as the opening and closing of a security door.

"The event detect and time stamp features in these ultrasmall devices operate in both normal and battery mode," said Rouben Gharagozian, marketing director for Intersil's real-time clocks product group. "These micropower RTCs, with their enhanced security functionality, are uniquely suited for a variety of applications ranging from security, warranty monitoring, data collection and recording."

According to the company, the devices can time stamp an event by either issuing an output signal or by stopping the RTC registers from advancing at the moment the event occurs. The output signal contains the second, minute, hour, date, month and year that the triggering event occurred.

The ISL1219/21 offer two options for switching from normal power to battery backup power. All RTC functions except the I?C bus are operational during battery backup mode unless disabled. The User SRAM is operational until battery power drops below 1.8V. The chip's integrated crystal compensation circuitry enables the use of a less expensive external crystal. The ISL1221 has a separate (frequency output) FOUT from the IRQ/FOUT in the ISL1219. The FOUT is programmable from 32.768kHz to 1/32Hz. It is used to clock the microcontroller in sleep mode, eliminating external crystal and further reducing the BOM.

The ISL1219, in a 10-lead MSOP, is priced at $1.50 each in 1,000 quantities. The ISL1221 is priced at $1.60. The company also provides evaluation boards for these devices.

- Vince Biancomano
eeProductCenter




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