Product category:
Analogue and Mixed Signal ICs
News Release from: Intersil | Subject: ISL1208
Edited by the Electronicstalk Editorial
Team on 13 May 2005
Real time clock saves on battery power
A new real time clock combines high precision with low-power consumption for use in a wide variety of applications that require very accurate clock and calendar functions.
Intersil has introduced a real time clock (RTC) that combines high precision and low-power consumption for use in a wide variety of applications that require very accurate clock and calendar functions The device incorporates Intersil's InterSeal battery saver technology that prevents current drain on the battery until the unit is first powered up - an obvious benefit for products that might be stored for some time before they are first used
This article was originally published on Electronicstalk on 8 Oct 2008 at 8.00am (UK)
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Applications for the RTCs include telecomms systems, consumer electronics, industrial, medical devices and security related equipment and systems.
In addition to providing accurate clock and calendar functions, the ISL1208's InterSeal battery saver technology prevents battery drain during a product's shelf life; this feature, along with the device's low 400nA current consumption at 3.0V and small footprint make it an ideal solution for handheld battery powered applications.
The ISL1208 integrates timing and crystal compensation circuitry, flexible alarm, programmable clock output, power fail detection and intelligent battery backup switching into one space-saving package.
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The ISL1208 RTC has timing and crystal compensation, clock/calendar, power fail indicator, periodic or polled alarm, intelligent battery backup switching and battery-backed user SRAM.
With its analogue trimming register (ATR) and digital trimming register (DTR) functions, external crystal frequencies can be easily tuned.
The device features an I2C interface that provides 400kHz data transfer rate.
It supports 15 selectable frequency outputs, power failure detection and automatic backup to battery or supercapacitor.
Applications with high accuracy requirements will benefit from using the ISL1208 that contains circuitry for adjusting the frequency of the crystal oscillator.
This circuitry can be used to tune oscillator frequency; critical in compensating for PCB layout and temperature changes.
The oscillator uses an external, low-cost 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 to 2099, with automatic leap year correction.
For microprocessor and other timing applications, the real time clocks can provide one of fifteen different frequency output signals via the IRQ/Fout pin.
Users have access to 2byte of battery-backed SRAM that can be used for scratchpad memory.
Applications with a limited power budget can use the device's low power mode for a supply current saving of about 400nA when powered from VDD.
The InterSeal battery saver feature prevents initial battery current drain before the RTC device is first used.
The ISL1208 is functionally compatible with the ST M41Txx and Maxim DS13xx devices.
The ISL1208 is available now, in either standard lead finish or Pb-free.
It is offered in an 8-lead SOIC package or an 8-lead MSOP.
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