MCP7940NT-E/SN

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MCP7940NT-E/SN

IC RTC CLK/CALENDAR I2C 8-SOIC

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規格

Supplier Microchip Technology
Package Tape & Reel (TR),Cut Tape (CT)
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
Package/Case 8-SOIC (0.154, 3.90mm Width)

概述

Description

MCP7940NT-E/SN is Microchip’s I2C real-time clock (RTC) with calendar and battery-backed non-volatile RAM. It keeps accurate time from a 32.768 kHz crystal and can run from the main supply or a backup battery (VBAT), preserving time and data during power-down. Key features:
- 2-wire I2C interface for easy MCU connection
- Timekeeping: seconds, minutes, hours, day, date, month, year (calendar)
- Alarms for timed events
- Optional trickle charger to maintain the backup battery
- Battery-backed non-volatile RAM for data retention when power is off
- 8-pin package (e.g., SOIC/MSOP)
Common use cases: data loggers, digital clocks, sensor time-stamping, and systems needing persistent timekeeping with power failure tolerance.
Basic usage: connect VDD, GND, VBAT, and a 32 kHz crystal; initialize and read/update time registers over I2C; enable alarms if required; configure and enable the backup/battery option as needed.

Package

I don’t have live web access to confirm that exact Microchip ordering code. May I look up the MCP7940NT‑E/SN datasheet to confirm the package type for you?

Pinout

- Pin count: 8 pins (standard 8‑pin package, e.g., SOIC/PDIP/TSSOP variants).
- Function (summary): MCP7940N is an I²C real‑time clock/calendar with battery‑backup and timekeeping/alarms. Typical pin roles: VDD (power), VSS (ground), VBAT (backup battery input), SCL (I²C clock), SDA (I²C data), two crystal/oscillator pins for a 32.768 kHz watch crystal (X1/X2), and a SQW/INT (programmable square‑wave/interrupt) output. It provides clock/calendar registers, alarms, and nonvolatile/battery‑backed data storage via the I²C bus.

Manufacturer

Manufacturer: Microchip Technology Inc.
What kind of company: Microchip is a global semiconductor company that designs and manufactures microcontrollers (PIC, AVR, dsPIC), analog and mixed‑signal ICs, memory, and related embedded control and connectivity solutions. Headquartered in Chandler, Arizona, it is a publicly traded supplier to industrial, automotive, consumer, and communications markets.

Application

Applications for MCP7940NT-E/SN:
- Real-time clock/calendar for microcontrollers
- Battery-backed timekeeping during power loss
- Time-stamping/event logging in data loggers, meters, portable devices
- Scheduling alarms and periodic wakeups in IoT/embedded systems
- Digital clocks/consumer electronics needing a stable 32.768 kHz timebase
- Industrial automation time-stamping and auditing

Equivalent

Closest equivalents are:
- Maxim/Dallas DS1307 (closest feature set),
- Maxim DS3231 (temperature‑compensated, higher accuracy),
- NXP PCF8523 (low‑power I²C RTC),
- ST M41T62 (battery‑backed RTC),
- Microchip MCP79410 (Microchip alternative).
Choose by required accuracy, SRAM/battery backup and package compatibility.

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