MCP7940MT-I/MNY

Real Time Clock Overview

The MCP7940MT-I/MNY is a Real-Time Clock/Calendar (RTCC) integrated circuit manufactured by Microchip Technology. It operates within an industrial temperature range of -40°C to +85°C and supports a supply voltage from 1.8V to 5.5V. The device features a timekeeping current of 1.2µA at 3.3V and includes 64 bytes of SRAM. Communication is handled via a 2-wire I²C interface with clock rates up to 400 kHz. It utilizes a 32.768 kHz crystal for timing, offering on-chip digital trimming with ±1 PPM resolution.

Real Time Clock Feature Summary

• Real-Time Clock/Calendar with dual alarms and leap year compensation
• On-chip digital trimming/calibration with ±129 PPM range
• 64-byte user-accessible SRAM
• Programmable multifunction output pin (MFP)

Real Time Clock Applications

• I2C-based microcontroller systems requiring precise timekeeping
• Low-power battery-operated devices
• Industrial equipment monitoring

Real Time Clock Procurement Notes

Verify the specific package type against the ordering suffix. The 'T' indicates TDFN packaging, while other suffixes may denote SOIC or TSSOP. Confirm the 'I' suffix corresponds to the industrial temperature range (-40°C to +85°C). Ensure the I2C pull-up resistors match the required bus speed specifications.

Real Time Clock Selection Notes

Select this component when a low-cost RTCC with integrated SRAM is required. The MCP7940MT-I/MNY is suitable for applications needing digital calibration to compensate for crystal tolerance. Verify that the system voltage falls within the 1.8V to 5.5V operating range and that the I2C bus timing requirements are met.

Real Time Clock Part Context

This part belongs to the MCP7940M series of low-power real-time clocks. The series offers various package options including SOIC, MSOP, TSSOP, PDIP, and TDFN. The MCP7940M provides versatility through programmable outputs and flexible alarm configurations, making it a common choice for embedded timekeeping solutions.

Real Time Clock Replacement Considerations

Direct replacements include other variants within the MCP7940M family, such as MCP7940MT-I/SN (SOIC) or MCP7940NT-I/MNY (automotive grade). Ensure compatibility regarding package dimensions and electrical characteristics before substitution.