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Name: MCP7940NT-E/SN
Brand: Microchip Technology
SKU: MCP7940NT-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Microchip Technology MCP7940NT-E/SN

Part No.:: MCP7940NT-E/SN

Manufacturer:: Microchip Technology

Package:: 8-SOIC (0.154, 3.90mm Width)

Datasheet:: MCP7940NT-E/SN.pdf

Description:: IC RTC CLK/CALENDAR I2C 8-SOIC

In Stock:: 3280

Quantity:: Add To Cart

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MCP7940NT-E/SN Specifications

Package/Case:
8-SOIC (0.154, 3.90mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
Automotive, AEC-Q100
ProductStatus:
Active
Type:
Clock/Calendar
Features:
Alarm, Leap Year, Square Wave Output, SRAM
MemorySize:
64B
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
I²C, 2-Wire Serial
Voltage-Supply:
1.8V ~ 5.5V
Voltage-SupplyBattery:
1.3V ~ 5.5V
Current-Timekeeping(Max):
1.2µA @ 3.3V
OperatingTemperature:
-40°C ~ 125°C
MountingType:
Surface Mount

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MCP7940NT-E/SN information

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Basic introduction and simple engineering application of MCP7940NT-E/SN

MCP7940NT-E/SN is a highly integrated Real-Time Clock (RTC) module, commonly used in electronic projects for timekeeping and scheduling applications. It incorporates a precise digital oscillator and a battery-backed SRAM, providing accurate timekeeping even in the absence of external power.

Introduction:

The MCP7940NT-E/SN RTC module is a convenient solution for adding timekeeping functionality to microcontroller-based projects. Its small form factor and simple interface make it suitable for various applications, including data logging systems, alarm clocks, and battery-powered devices.

Features:

- Real-Time Clock with calendar functionality.

- Battery backup for continuous timekeeping.

- I2C interface for easy communication with microcontrollers.

- Alarm and timer functions for scheduling tasks.

- 64 bytes of battery-backed SRAM for data storage.

Application Scenario:

In a simple weather station project, the MCP7940NT-E/SN RTC module can be utilized to timestamp sensor readings and schedule data transmission intervals. Let's explore how to incorporate this module into the project:

Circuit Design:

To integrate the MCP7940NT-E/SN RTC module into the weather station project, follow these steps:

1. Connection Setup:

Connect the MCP7940NT-E/SN module to the microcontroller using the I2C bus. Ensure proper pull-up resistors are connected to the SDA and SCL lines.

2. Initialization:

Initialize the RTC module in the microcontroller firmware by configuring the I2C communication and setting the current date and time. Utilize the provided library or write custom code to interact with the RTC registers.

3. Sensor Integration:

Connect weather sensors, such as temperature and humidity sensors, to the microcontroller. Read sensor data periodically and store it along with the timestamp obtained from the RTC module.

4. Data Logging:

Store the sensor readings and timestamps in non-volatile memory, such as an SD card or external EEPROM. Use the battery-backed SRAM of the MCP7940NT-E/SN module to retain critical data in case of power loss.

5. Task Scheduling:

Utilize the alarm and timer functions of the MCP7940NT-E/SN module to schedule tasks, such as data transmission or system maintenance. Set alarms at predefined intervals to trigger specific actions in the microcontroller firmware.

Experimentation:

To understand the functionality of the MCP7940NT-E/SN module better, try the following experiment:

Experiment: Setting and Reading Time

1. Set Current Time: Write a firmware code to set the current time and date in the MCP7940NT-E/SN RTC module via the I2C interface.

2. Read Time: Develop a routine to read the current time and date from the RTC module and display it on a serial monitor or an LCD display.

3. Verify Accuracy: Compare the time displayed by the RTC module with a reliable time source, such as an internet-based clock, to verify its accuracy.

4. Implement Alarms: Explore the alarm functionality of the RTC module by setting alarms for specific times and observing the corresponding actions in your project.

Conclusion:

In conclusion, the MCP7940NT-E/SN RTC module is a versatile component that enhances the timekeeping capabilities of electronic projects. By following the provided guidelines and experimenting with its features, students and beginners can gain valuable insights into real-time clock functionality and its applications in embedded systems.

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