The world's lowest powered RTCs, NXP's PCF8523 and PCF2123 are designed to perform critical time-keeping functions in a range of applications. These small, highly efficient CMOS RTC/calendars fit nearly anywhere and cut power demands by as much as 60%.
Optimized for low power consumption, they operate at a current of less than 100 nA with a 2.0 V power supply, and consume less than 0.2 μW of power.
Key features
- 32.768 kHz quartz crystal
- Resolution 1 sec
- Freely programmable timer and alarm function with interrupt
- Internal Power-On Reset
- Programmable frequency offset register for quartz tolerance compensation
- Programmable offset register
- Watchdog timer
Both devices are cased in tiny leadless packages that save space in compact designs. This makes them well suited for handheld and battery-operated applications, including blood-pressure monitors and other home-use medical devices, pocket calculators, portable phones, and PDAs.
They are also an excellent choice for white goods, such as washing machines, metering units, and other industrial systems. Both devices can be powered by a very small battery cell or a super-cap.
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