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I2C-bus interface real time clock

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article image 32.768kHz clock output is stable and free of voltage fluctuation effects.

EPSON, represented by TE Australia , has released the RX-8025SA/NB I2C-bus interface-compliant real time clock.

It has a 32.768kHz quartz oscillator. It can generate six types of interrupts. It has a dual-alarm function and an oscillation stop detection function. This is used to detect the presence of valid internal data at power-on. The cycle time range for the CPU interrupt generation function is from one month to 0.05 seconds and includes interrupt flags and interrupt stop functions.

A power supply voltage monitoring function (with selectable detection threshold) and a digital clock precision adjustment function that can be used to set various levels of precision round out the additional features this RTC has to offer. Since the internal oscillation circuit is driven at a constant voltage, the 32.768kHz clock output is stable and free of voltage fluctuation effects.

EPSON's RTC modules integrate the clock IC and the 32kHz crystal in one housing. This structure leads to a reduction of required PCB space and power consumption. The module operates from 1.7V to 5.5V. It has a current consumption of 0.48μA (typ.) at 3V.

There are two types of packages available for the RX-8025. The SA type is a 10mm x 5mm x 3.2mm SOP 14-pin plastic SMD package, and the NB type is a 6.3mm x 5mm x 1.3mm SON 22-pin plastic SMD package.

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