MAX6855UK39D6+T

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MAX6855UK39D6+T Application Field and Working Principle

The MAX6855UK39D6+T is a very common device under the PMIC - Supervisors family of integrated circuits, extensively used in portable electronic devices and embedded system. It is manufactured by Maxim Integrated which is world-renowned for its specialized ICs and systems. The MAX6855UK39D6+T combines the functions of a real-time clock and memory supervisor into a single package and is one of the company’s most successful products in this category. In this article we will discuss the MAX6855UK39D6+T application and its working principles.

Applications
The MAX6855UK39D6+T is a flexible, integrated circuit ideal for today’s portable device and embedded systems. The IC provides an accurate time-of-day clock and NVRAM with a battery-backed mode. It features a 25-bit temperature-compensated register, and an internally generated time-of-day clock as maintained by an external quartz crystal. Moreover, the MAX6855UK39D6+T provides non-volatile SRAM management, meaning the SRAM will not lose its contents in the event of a power loss. This makes it especially attractive for applications such as handheld medical devices, mobile phones, automotive and industrial systems.

Working Principle
The MAX6855UK39D6+T consists of a real-time clock core, NVRAM memory, and battery monitors. Its low-power oscillator consists of a single crystal and two load capacitors, which provide independent temperature compensation for both units. The oscillator is designed to create a precise time-keeping signal, typically with a frequency accuracy of ±1 ppm over an extended temperature range. The oscillator signal is then outputted to the real-time clock (RTC) core and used to drive the clock. The NVRAM of the MAX6855UK39D6+T is accessed via an SPI port. This memory will never lose its contents as it is powered by a capacitor that is kept charged via a battery.

The battery monitor of the MAX6855UK39D6+T is designed to monitor the power source of the device and will alert the user when the battery is running low, thereby ensuring uninterrupted operation. The device also includes a power-fail detect, which will generate an interrupt signal when the power supply is compromised. The power-fail detect also keeps track of how long the power has been off, thus allowing the system to completely shut down in the event of a prolonged power failure.

The MAX6855UK39D6+T is an essential IC for embedded and portable electronic device designs. It is simple to integrate into existing designs, thanks to its flexibility and its compatibility with standard industry interfaces. With its wide temperature range, user-friendly features and low power consumption, this device is ideal for any application requiring accurate time keeping and non volatile memory back-up.

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