MCP795B11-I/ST

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MCP795B11-I/ST is an ultra-low power digital Real Time Clock (RTC) for use in digital battery-powered applications. This clock is capable of maintaining time accuracy with an integrated battery supply, independent of the host system power, even when the system is powered off. High accuracy is achieved with the RTC portion of the device operating in the XTAL crystal-backed mode. There are two operational features: a built-in trimming capacitor to mid-plate the crystal frequency and a single byte clock trim register.

MCP795B11-I/ST is designed to provide accurate date and time information, even when experienced significant power spikes. The device uses a switched capacitor network to provide stable power to the RTC circuitry of the device, and a 32.768 kHz watch crystal is connected to the oscillator of the RTC for timekeeping when the device is powered down. The MCP795B11-I/ST offers a variety of ways to access and configure time: a serial interface, an embedded I2C driver, and a dedicated Clock TRIM Register to make real-time clock accuracy accessible to the end user.

The main application field for MCP795B11-I/ST is powering battery-backed embedded applications or platforms. Most of these devices include microcontrollers, sensors, and other embedded devices, where a reliable real time clock is often required for time tracking and measurement. This type of clock is also suitable for applications where the power-loss situation is severe and often, like in remote areas and in automotive applications.

The working principle of the MCP795B11-I/ST device allows it to accurately maintain the time in the absence of a power source. The switching network integrates a capacitor which allows the RTC to continue functioning even when the device is powered off. The crystal oscillator will continue to operate, provided the device is receiving internal battery power, and the single byte clock trim register can help to adjust the accuracy of the RTC.

The I2C serial interface allows setting day, date and time, as well as configuring routines for auto-calibration and time adjustment. The clock can also be configured for auto-calibration by setting the auto-calendar logic and the periodic auto-calibration register. The auto-calibration logic will monitor the clock accuracy over time, and the periodic auto-calibration register will allow control over the number of auto-calibrations to be made.

The single byte clock TRIM register can help to adjust the accuracy of the RTC. The RTC can be programmed to update the clock trim register with a single byte over a 7-bit I2C interface to support a wide range of clock accuracies. The frequency range of the oscillator also can be adjusted by using the built-in trimming capacitor. The adjustable frequency range of the MCP795B11-I/ST is between 32.700 kHz and 32.812 kHz.

In summary, the MCP795B11-I/ST is a reliable and accurate Real Time Clock (RTC) for a variety of applications. It has an integrated battery supply and features an I2C serial interface and a single byte clock trim register that help with adjusting its accuracy. The device also has an adjustable frequency range, so it can fit into different application requirements. It has a wide range of applications, including battery-backed embedded applications, remote areas, and automotive uses.

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