Product category:
Analogue and Mixed Signal ICs
News Release from: Intersil | Subject: ISL1209
Edited by the Electronicstalk Editorial
Team on 20 July 2005
Real time clock takes system management
onboard
A new real time clock integrates timing and crystal compensation, flexible alarms, programmable clock output, power fail detection and intelligent battery backup switching into one package.
In addition to providing accurate clock and calendar functions, a new real time clock (RTC) from Intersil integrates timing and crystal compensation, flexible alarms, programmable clock output, power fail detection and intelligent battery backup switching into one space saving package The device's low 400nA current consumption at 3.0V and its small package make it an ideal choice for portable, handheld, battery-powered equipment and microprocessor applications where space is at a premium
This article was originally published on Electronicstalk on 8 Jan 2001 at 8.00am (UK)
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The ISL1209 has an event detect and time stamp function.
This function is important for applications requiring increased security, warranty monitoring, data collection and/or event recording.
The feature enables the recording of event times, such as when an enclosure or door was opened, thus making the ISL1209 ideal for applications requiring anti-tampering and security such as set-top boxes, utility meters, security alarm and security camera systems or vending machines.
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Additionally, applications with high accuracy requirements will benefit from using the ISL1209, which contains circuitry for adjusting the frequency of the crystal oscillator through ATR (analogue trimming registers) and DTR (digital trimming registers).
This circuitry can be used to tune oscillator initial frequency, as well as adjust to compensate for temperature changes.
The oscillator uses an external, 32.768kHz 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 IRQ/FOUT provides one of 15 different frequency output ranging from 32.768kHz down to 1/32Hz for microcontroller and other timing circuits.
Users have access to 2byte of battery-backed SRAM that can be used for scratchpad memory.
The device incorporates Intersil's InterSeal battery saver technology, which prevents any current drain on the battery until the unit is first powered up.
This feature is an obvious benefit for products that might be stored for some time before they are first used.
Applications for such products include telecomms systems, consumer electronics, industrial, medical devices and security related equipment and systems.
Target applications for the ISL1209 are many and varied and include utility meters, HVAC and POS equipment, test meters and fixtures, vending machines, ATM, postage stamp dispensers, cellular infrastructure and fixed broadband wireless equipment, computer products and office automation equipment (copiers, fax requiring time stamp), security and anti-tampering applications, panel/enclosure status, warranty reporting, time stamping applications, patrol/security check (fire or light equipment) and automotive applications.
The ISL1209 is available now in a 10-lead MSOP package with either standard lead finish or Pb-free.
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