MCP79512-I/MS

Real Time Clock Overview

The MCP79512-I/MS is a battery-backed SPI Real-Time Clock/Calendar manufactured by Microchip Technology. It operates within an industrial temperature range of -40°C to +85°C and supports a supply voltage of 1.8V to 3.6V. The device integrates 64 bytes of SRAM, 1 Kbit of EEPROM, and a 128-bit protected area preprogrammed with an EUI-64 MAC address. Timekeeping features include hundredths of seconds tracking, leap year compensation through 2399, dual programmable alarms, and power-fail timestamps. It utilizes a 32.768 kHz crystal or external clock input via an SPI interface operating up to 5 MHz.

Real Time Clock Feature Summary

• Integrated 128-bit Protected EEPROM Area Preprogrammed with EUI-64 MAC Address
• Dual Programmable Alarms with Interrupt Output on Multifunction Pin
• Power-Fail Timestamp Logging for Power Switchover Events
• On-Chip Digital Trimming with ±1 ppm Resolution for Frequency Calibration

Real Time Clock Applications

• Industrial Systems Requiring Accurate Timekeeping and Data Logging
• IoT Devices Utilizing EUI-64 Addresses for Network Identification
• Battery-Powered Embedded Applications with Low Current Consumption Requirements

Real Time Clock Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature grade (-40°C to +85°C) and 'MS' denotes the 10-lead MSOP package. Confirm that the EUI-64 address is factory-programmed and immutable unless the unlock sequence is executed. Ensure the host system supports the required SPI protocol and voltage levels compatible with the 1.8V to 3.6V operating range.

Real Time Clock Selection Notes

Select this component over the MCP79511 variant if an EUI-64 identifier is required instead of EUI-48. Compare current consumption specifications against application requirements, noting typical timekeeping currents of 1.2 µA at 3.0V from VCC. Ensure the design accommodates the necessary external load capacitors for the 32.768 kHz crystal oscillator circuit.

Real Time Clock Part Context

This part belongs to the MCP795XX family of battery-backed RTCCs. It shares functional similarities with the MCP7951X series but is distinguished by its unique ID configuration. The device is designed for direct interfacing with microcontrollers supporting SPI communication, offering a compact solution for timekeeping and non-volatile storage in space-constrained designs.

Real Time Clock Replacement Considerations

The MCP79511-I/MS serves as a functional substitute if EUI-48 addressing is acceptable. Other members of the MCP795XX family may be considered based on EEPROM capacity requirements, though pin compatibility and memory maps must be verified.