MCP7940MT-I/MNY

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The MCP7940MT-I/MNY Real Time Clock (RTC) is a small and low power clock/calendar that operates over a wide range of operating temperatures. It is well suited for applications such as automotive and industrial automation, home automation, and other consumer applications. The MCP7940MT-I/MNY is an advanced, easy-to-use, single-chip clock/calendar implementation that supports multiple features such as 64Hz/1024Hz periodic interrupt, super capacitor battery backup, trickle charger and programmable alarms.

Applications

The MCP7940MT-I/MNY has a wide range of applications in consumer, automotive and industrial applications. It is ideal for time-stamping and recording events such as vehicle or machine diagnostics, medical history and personnel access control. It can also be used in industrial automation and home automation systems to control schedules and timing such as lighting, cooking and HVAC systems.

Working Principle

The MCP7940MT-I/MNY RTC operates over a wide range of operating temperatures and is re-programmable via an I2C interface. The device contains a real-time clock function, calendar function, 64Hz/1024Hz periodic interrupt, programmable alarms, and battery backup. The real-time clock keeps track of the current time of day, the clock can be adjusted to have a very small error. The calendar function keeps track of the current day, month and year. The 64Hz/1024Hz periodic interrupts can be used for events such as waking up microcontrollers from sleep mode and for periodic events. The programmable alarms can be used to trigger an interrupt upon reaching a pre-defined time and date. The battery backed-up real-time clock and calendar keep track of time even if the main power is turned off, allowing the device to remain accurate even if the main power is interrupted.

The MCP7940MT-I/MNY RTC includes a built-in super capacitor charger that can be used to maintain and top-off the battery voltage while in low power modes. The trickle charger detects when the device is in a low power mode, and triggers a trickle charge to keep the battery fully charged and ready for operation. This allows the device to remain accurate for longer periods of time when main power is not present.

The I2C serial bus allows the MCP7940MT-I/MNY RTC to be easily interfaced with various microcontrollers and systems. The I2C serial bus is an open-drain bus which allows for communication with multiple devices at the same time. It also allows for low power operation by selectively enabling the bus and only using the bus when needed.

Conclusion

In conclusion, the MCP7940MT-I/MNY Real Time Clock is well suited for a wide range of applications, including automotive, industrial automation, home automation, and other consumer applications. Its features such as 64Hz/1024Hz periodic interrupts, programmable alarms, and battery backup allow it to be used in a variety of applications in low power mode. The I2C serial interface allows it to easily interface with microcontrollers, allowing for further customization and integration into a variety of systems.

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