MCP795W12-I/SL

Real Time Clock Overview

The MCP795W12-I/SL is a battery-backed SPI Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology. It operates within an industrial temperature range of -40°C to +85°C and supports supply voltages from 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. Key features include dual programmable alarms, a watchdog timer, event detection modules, and automatic power-fail timestamping.

Real Time Clock Feature Summary

• Integrated 1 Kbit EEPROM and 64-byte battery-backed SRAM for data retention
• Preprogrammed 128-bit protected EEPROM containing an EUI-64 MAC address
• Dual programmable alarms and configurable event detect modules
• Automatic switchover to backup supply with power-fail timestamp logging

Real Time Clock Applications

• Systems requiring unique hardware identification via EUI-64 addresses
• Industrial devices needing robust timekeeping with watchdog functionality
• Battery-powered applications utilizing low-power RTC modes
• Embedded systems integrating SPI-based clock and calendar tracking

Real Time Clock Procurement Notes

Verify the specific suffix 'I/SL' corresponds to the Industrial temperature grade (-40°C to +85°C) and SOIC-14 package. Confirm that the EUI-64 address is factory-programmed as indicated by the '12' in the part number. Ensure the design accommodates the 1.8V to 3.6V operating voltage range and SPI interface requirements.

Real Time Clock Selection Notes

Select this component when an EUI-64 identifier is required directly on the RTC chip. Compare against MCP795W10 if no unique ID is needed, or MCP795W22 if 2 Kbit EEPROM capacity is preferred. Ensure the application utilizes an SPI master capable of supporting the specified clock rates and instruction set.

Real Time Clock Part Context

This device belongs to the MCP795WXX family of SPI RTCCs. The '12' designation specifically indicates 1 Kbit EEPROM storage paired with a factory-programmed EUI-64 address. It shares functional similarities with other family members but differs in memory size and ID configuration.

Real Time Clock Replacement Considerations

MCP795W12T-I/ST offers identical electrical characteristics and pinout in a tape-and-reel package instead of tube packaging. MCP795W22-I/SL provides 2 Kbit EEPROM with the same EUI-64 address but requires verification of memory mapping differences.