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MCP7940M
  • MCP7940M
  • MCP7940M
  • MCP7940M
  • MCP7940M
  • MCP7940M

MCP7940M

In Production

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. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies....

Microchip Technology MCP7940M Product Info

16 April 2026 1

Parameters

EEPROM Data Memory Bytes

0

Unique ID with MAC Address

None

User SRAM (Bytes)

64

Max Interface Speed

400 KHz

Minimum Clock Count

1 sec

Pin Count

8

Temp Range Max (°C (degrees Celsius))

85

Temp Range Min (°C (degrees Celsius))

-40

Features

  • Hours, Minutes, Seconds, Day of Week, Day, Month, Year
  • Leap year compensated  to 2399
  • 12/24 hour modes
  • 1 PPM Resolution
  • ±129 PPM Range
  • Dual Programmable Alarms
  • Clock output with selectable frequency
  • Alarm output
  • General Purpose output
  • 64 Bytes SRAM
  • I2C Clock Frequency up to 400 kHz
  • Operating Voltage 1.8V to 5.5V
  • Low Typical Timekeeping Current

Description

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. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies.

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