MCP79520T-I/MN

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MCP79520T-I/MN is a Real Time Clock (RTC) chip developed by Microchip. It is a low-power, synchronous clock and calendar device with a built-in power down feature. This RTC chip is designed to be used in applications such as embedded systems, non-volatile memory, sensors, meters, and embedded control systems, and is easily integrated into systems. The MCP79520T-I/MN provides accurate date, time and frequency data with integrated power down protection.

Application Field

The MCP79520T-I/MN is mainly used in single board computers and embedded systems where accurate timekeeping and accurate data are important. This RTC chip is suitable for use in devices such as security systems, automation and control systems, vending machines, and medical devices. The MCP79520T-I/MN is also used in industrial automation and process control systems such as distributed systems, remote sensors and monitoring systems.

In automotive applications, the MCP79520T-I/MN is used to provide accurate timing information for operations such as airbag deployment, emission control, and engine management. In suite phone systems, the MCP79520T-I/MN is used for call maintenance and call log management. The MCP79520T-I/MN is well suited for use in alarm systems where it is used to record time related data such as the time and date when an alarm is triggered.

Working Principle

The MCP79520T-I/MN is based on an oscillator circuit which uses an external crystal as its reference frequency source. The clock operates at a fixed 32.768kHz crystal frequency and is capable of running in either a run or standby mode. The oscillator frequency is divided down to 1Hz or 0.5Hz, depending on the user-defined pre-scaling value. The clock is tuned to the crystal frequency and the accuracy of the real-time clock is ensured using capacitor-resistor (CR) oscillator trimming.

The MCP79520T-I/MN uses multiplexed addresses for reading and writing. In communication, byte addressing is used to access registers. Data is stored in a 6 byte Format which allows for Daylight Saving Time (DST) adjustment. The registers also have register masks that allow user-defined bits to be frozen and not altered with a write operation. The RTC registers are protected from accidental write operations.

The MCP79520T-I/MN is a low power RTC with an integrated power down feature. The power down feature prevents the battery from being drained when the system is not in use. The RTC contains a battery-backed SRAM which stores non-volatile data and a real-time clock which maintains time and date information. When the main power is lost, the power down feature is activated and the internal clock circuit is stopped and all the data stored in the SRAMs is preserved, keeping the time and event data intact.

The MCP79520T-I/MN has an integrated alarm system that can generate an interrupt when a specified time, date or event occurs. The alarm system can be configured to trigger a variety of events including but not limited to an interrupt and/or a timer reset. Additionally, the MCP79520T-I/MN contains several interrupt sources that allow user-defined interrupts such as calendar alarm, time alarm and event alarm.

Conclusion

The MCP79520T-I/MN is a highly-accurate, low power and reliable real-time clock that can be used in a variety of applications in single board computers, embedded systems and automotive applications. This RTC chip is capable of using an external crystal as its reference frequency and offers an integrated power down feature to preserve battery life. The MCP79520T-I/MN also includes an integrated alarm system and a variety of interrupt sources to provide accurate timing information for operations in a variety of applications.

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