I²C-bus interface RTC includes 32 kHz crystal
8 September 2004
Electronics Technology
With the needs of today's smaller mobile equipment in mind, Epson developed an ultra-compact and thin RTC (realtime clock) module. The RX-8025SA/NB is an I²C-bus interface-compliant realtime clock, which includes a 32,768 kHz quartz oscillator that has been adjusted for high precision.
The module has many additional features; like providing a function for generating six types of interrupts, a dual alarm function, and oscillation stop detection function (used to determine presence of valid internal data at power-on). The cycle time range for the CPU interrupt generation function range from one month to 0,05 s and include 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 are additional features. Since the internal oscillation circuit is driven at a constant voltage, the 32,768 kHz clock output is stable and free of voltage fluctuation effects.
All Epson's RTC modules integrate both the clock IC and the crystal in one housing, reducing the required PCB space and power consumption. It operates over the wide 1,7 V to 5,5 V range and consumes only 0,48 μA (typ at 3 V). Two package types are available: the SA type is a 10 x 5 x 3,2 mm SOP 14-pin plastic SMD package, and the NB type is a 6,3 x 5 x 1,3 mm SON 22-pin plastic SMD package.
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