MCP7940NT-I/ST

Interface:	I²C, 2-Wire Serial
Base Part Number:	MCP7940N
Supplier Device Package:	8-TSSOP
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Current - Timekeeping (Max):	1.2µA @ 3.3V
Voltage - Supply, Battery:	1.5 V ~ 5.5 V
Voltage - Supply:	1.8 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	64B
Features:	Alarm, Leap Year, Square Wave Output, SRAM
Type:	Clock/Calendar
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The MCP7940NT-I/ST is a real time clock (RTC) chip that can be used in a multitude of applications. It is a low-cost, high-performance clock IC, and can provide an accurate, reliable and highly integrated timing solution for almost any application.The MCP7940NT-I/ST is a 32kHz RTC designed for small and medium-sized applications. It features 9-bit programmable registers including week, day, hour, minutes and seconds, which are all settable via SPI/I2C communication interface. The MCP7940NT-I/ST also includes an adjustable internal oscillator, a programmable alarm, a watchdog timer and a battery management circuit, as well as a host of additional features.The MCP7940NT-I/ST is a popular choice for clock/timing applications. It is capable of providing accurate, reliable and low-power timing accuracy for a wide range of devices. It is designed for operation at 3V (2.4V to 3.6V) and features a wide operating temperature range of 0°C to 70°C. It has an EEPROM data retain capability which allows for data to be stored on-board and preserved even after powering down.The MCP7940NT-I/ST is suitable for applications requiring both low-power and accuracy, such as smart metering and remote telemetry applications. This RTC can accurately keep track of time, enabling a wide variety of applications that require accurate time measurement. It can also be used in applications such as time synchronization, event logging, and remote monitoring.The architecture of the MCP7940NT-I/ST is based on a memory-mapped system interface. It allows external systems to access the RTC data registers using an external system interface. The registers within the RTC are broken into four groups: General Purpose Control (GPC), Timekeeping (TKP), Alarm (ALM) and Programmable Control (PCS). The GPC and TKP registers allow for the setting of date and time parameters, while the ALM and PCS registers handle setting and control of the alarm, and other functions.The working principle of the MCP7940NT-I/ST is to generate a stable oscillator frequency and count the pulse from the frequency according to pre-programmed registers, then store the data into RAM by SPI or I2C communication interface.The MCP7940NT-I/ST is designed for low power consumption, low frequency operation and a high accuracy time keeping ability. It can operate at a frequency as low as 1Hz and still maintain accuracy. The chip also has a backup battery support, which ensures that time information is not lost when the primary power source is lost.The MCP7940NT-I/ST is a low cost and reliable solution for time keeping applications. It provides accurate timing, low power operation, and wide temperature range support. This makes it well suited to many applications such as remote monitoring, energy metering, and event logging.

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