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RTC trait minimizes battery drain

Milpitas, Calif. — Intersil Corp.'s real time clock (RTC) combines high-precision and low-power for a variety of applications that require accuracy and calendar functions.

The device incorporates Intersil's InterSeal battery saver technology, which prevents any current drain on the battery until the unit is first powered up.

The ISL1209 also features an event detect and time stamp function; this is important for applications requiring increased security, warranty monitoring, data collection and/or event recording. The feature allows for recording event times, such as, when an enclosure or door was opened, etc. This makes the ISL1209 suited for applications requiring anti-tampering and security such as set-top boxes, utility meters, security alarm and security camera systems or vending machines.

“In addition to providing accurate clock and calendar functions, our new real time clock integrates timing and crystal compensation, flexible alarm, programmable clock output, power fail detection and intelligent battery backup switching into one space saving package,” said Rouben Gharagozian, marketing director for timing devices at Intersil. “In addition, its low 400 nA current consumption at 3.0 V and small package make it an ideal choice for portable, handheld, battery-powered equipment and microprocessor applications where space is at a premium.”

The RTC contains circuitry for adjusting the frequency of the crystal oscillator through analog trimming registers (ATR) and digital trimming registers (DTR). This circuitry can be used to tune oscillator initial frequency, as well as to adjust to compensate for temperature changes. The oscillator uses an external, 32.768-kHz crystal. The RTC tracks time with separate registers for hours, minutes and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.

The ISL1209 is available now in a 10-lead MSOP package with either standard lead finish or Pb-free. The suggested resale price in 1,000-unit quantities is $1.30. Click here for the ISL1209 data sheet.

Intersil Corp. , 1-888-468-3374, www.Intersil.com.

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