PCF85063AT/AY

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PCF85063AT/AY is an extremely low-power clock/calendar with trickle charger by NXP Semiconductors. It offers two different types with different power consumption and support capabilities in order to match the applicable markets. This article will discuss the application field and working principle of PCF85063AT/AY.

The primary application field of this real-time clock is to accurately keep track of date and time in embedded systems, when an external power source is unavailable or not reliable. It is specifically designed to work with low power electronic devices, such as smart meters, home automation, smoke/gas detectors, vehicle tracking, security alarms and medical devices. This chip has features, such as a trickle charger, which allows it to maintain power without a stable external power source for a prolonged period of time and auto-reset functional, which uses periodic voltage spikes to reset the chip, even in case of some power disruption.

The main feature of PCF85063AT/AY real-time clock is its low power consumption. It offers two types – type \'A\' and type \'Y\'. Type \'A\' has an integrated 32.768 kHz oscillator and consumes just 300nA of typical current when running in idle mode. Type \'Y\' has an external oscillator, so it can be trimmed to match the specific application and provides lower power consumption of only 200nA. Moreover, it supports multiple powering modes – dedicated voltage rails, VDD or battery – with integrated rechargeable battery support. This clock provides precision time keeping in range from -40°C to 85°C.

The main working principle of PCF85063AT/AY is based on a 32.768 kHz oscillator which creates the main clock signal and supplies input clock frequency to the low-power oscillator. This oscillator divides the incoming frequency by 128 to get 256 Hz frequency. This signal is used to update the internal register after a specific period of time. The register is updated every second and it stores data, such as time, date and alarm data. Additionally, it contains a time-base correction system which is used to correct the signal output frequency when it is affected by external influences.

In conclusion, PCF85063AT/AY is an excellent low-power real-time clock with integrated trickle charger, designed to provide reliable time keeping in battery operated embedded systems. Its two types offer different power consumption and capabilities in order to match the specific application field. This chip has integrated time-base correction system and a wide temperature range for operation. All of its features make it suitable for use in smart meters, home automation, smoke/gas detectors, vehicle tracking and other battery powered devices.

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