MCHPMCP7940N-I/SN

Overview

The MCP7940N-I/SN is a low-power I2C Real-Time Clock/Calendar (RTCC) that includes 64 bytes of SRAM for general-purpose data storage. It features digital timing compensation for crystal frequency drift and provides automatic switching to a backup battery supply to maintain time during power outages.

Why Choose This Part

This RTCC includes an on-chip digital trimming circuit that allows for high-precision timekeeping by compensating for crystal tolerances and temperature-induced drift. Its extremely low operating current extends battery life in backup modes, and the integrated 64-byte SRAM offers a convenient space for storing volatile configuration parameters without consuming MCU resources.

Applications

Getting Started

To begin development, connect a 32.768 kHz crystal to the X1 and X2 pins and pull-up resistors to the SDA and SCL I2C lines. Engineers can use the Microchip MCP7940N PICtail Plus Daughter Board (AC164137) for rapid prototyping with existing Microchip microcontroller development kits.

MCP7940 Family

Comparing specs that differ across variants. The current part is highlighted.