OM13516UL is an evaluation board for PCF85263B. The NXP PCF85263 is a CMOS real-time clock (RTC) and calendar suitable for low-power applications and automatically switches to battery when mains power is lost. The PCF85263 can be configured as a stopwatch (or elapsed time counter) with resolutions up to 1/100 second. Triple timestamps allow easy registration of special events, and the device can also register tamper detection or battery switch times.
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