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Datasheet Microchip MCP7940M-I/P

Part NumberMCP7940M-I/P

The MCP7940M I2CTM compatible real-time clock/calendar (RTCC) includes SRAM and a digital trimming circuit for accuracy which is normally found in higher priced devices


  • Download » Datasheet PDF, 1.3 Mb, File published: Jun 23, 2014
    MCP7940M Low-Cost I2C RTCC with SRAM
    Docket ↓
    Low-Cost I2Cв„ў Real-Time Clock/Calendar with SRAM
    Timekeeping Features: General Description: Real-Time Clock/Calendar (RTCC):
    -Hours, Minutes, Seconds, Day of Week, Day,
    Month, Year
    -Leap year compensated to 2399
    -12/24 hour modes Oscillator for 32.768 kHz Crystals:
    -Optimized for 6-9 pF crystals On-Chip Digital Trimming/Calibration:
    -В±1 PPM resolution
    -В±129 PPM range Dual Programmable Alarms Versatile Output Pin:
    -Clock output with selectable frequency
    -Alarm output
    -General purpose output The MCP7940M Real-Time Clock/Calendar (RTCC)
    tracks time using internal counters for hours, minutes,
    seconds, days, months, years, and day of week.
    Alarms can be configured on all counters up to and
    including months. For usage and configuration, the
    MCP7940M supports I2C communications up to 400
    kHz. Low-Power Features: Package Types Wide Voltage Range:
    -Operating voltage range of 1.8V to 5.5V Low Typical Timekeeping Current:
    -Operating from VCC: 1.2 ВµA at 3.3V User Memory: 64-byte SRAM The open-drain, multi-functional output can be
    configured to assert on an alarm match, to output a
    selectable frequency square wave, or as a general ...



Lifecycle StatusProduction (Appropriate for new designs but newer alternatives may exist)




Alarms2 Alarms (1 sec)
Digital_Trimming-127 to +127ppm (1 ppm steps)
Operating Temperature Range-40 to +85 °C
Temperature Range-40 to +85
Unique IDNone MAC_Address
User SRAM64 Bytes
Vcc Range1.8 - 5.5 V

Eco Plan


Moldel Line

Series: MCP7940M (9)

Manufacturer's Classification

  • Clock and Timing > Real-Time Clock > RTCC

Other Names:

MCP7940MI/P, MCP7940M I/P

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