ISL1208IU8

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Real time clocks (RTCs) are essential components for application design having periodic functions. This article is about the ISL1208IU8, which is a specification for ultra-low power digital real-time clock family with Trickle Charge Timer feature.

Application Field

The ISL1208IU8 can be used in various types of electronic systems designed to measure time, date and elapsed time. Wearables, portable data loggers, embedded systems, energy meters, healthcare devices, security and alarm systems, automotive, and much more are some of the applications that benefit from the ultra-low power consumption of the ISL1208IU8.

The ISL1208IU8 has a wide array of features that make it ideal for wearables such as sports, fitness tracking and health care. It has features like low-current consumed during the standby state; versatility in the measurement of Date-Time and elapsed-time; a programmable periodic interrupt for indicating the status of the device; a programmable scaling factor to adjust the accuracy of the clock frequency; and a unique shutdown feature that allows the user to choose a Standby mode for when the clock is not needed, thereby conserving power.

In automotive, important automotive functions and diagnosis depend on real time clock and timers. ISL1208IU8 is the ideal real time clock and trickle charge timer with quick startup time. Its long battery backup time and low standby power consumption help to improve power and design efficiency.

Working Principle

The ISL1208IU8 is based on the industry-leading asynchronous design, allowing it to achieve low power consumption and precise timing performance. It has an oscillator circuit which can be rapidly charged/discharged at run-time, as well as a real-time clock control logic. The oscillator is based on a 32.768kHz crystal with Trickle Charge Timer (TCT) feature, which allows the oscillator to be charged faster and more precisely. The oscillator capacitance can be adjusted to optimize performance for a given application requirement.

The real-time clock control logic consists of a clock generator, an alarm generator, a calendar, and additional support circuitry. The clock generator allows for setting the clock of the device. The alarm generator is used to set alarm times and to enable/disable alarm signals. The calendar contains the current Date-Time information as well as historical data. The ISL1208IU8 also supports a programmable periodic interrupt, which can be used to generate periodic events and signals.

The ISL1208IU8\'s power consumption is further reduced by its built-in Stand-by mode and the Trickle Charge Timer (TCT) feature, which allows the oscillator to be charged faster and more precisely. The Stand-by mode is used to lower power consumption when the device is not in use. The TCT feature uses a series of tiny pulses at the crystal frequency to keep the oscillator in a charged state.

Other features of the ISL1208IU8 include a programmable scaling factor support for adjusting the clock frequency of the device, battery powered back-up, and 3.3V supply voltage. The ISL1208IU8 is available in a wide variety of packages, including through-hole, surface-mount, and height-adjustable packages to reduce design footprint. The ISL1208IU8 is temperature compensated and supports up to 10 years operating life from a single coin battery.

Conclusion

The ISL1208IU8 is a versatile ultra-low power digital real-time clock family with trickle charge timer feature. It has the industry-leading asynchronous design and the flexibility to customize the timer and the timing accuracy. It is ideal for time-critical applications such as wearables, embedded systems, energy meters, and automotive systems.

The ISL1208IU8 offers outstanding power efficiency and flexibility, making it the perfect choice for applications demanding the highest level of accuracy and performance.

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