MCP795W12T-I/SL

Real Time Clock Overview

The MCP795W12T-I/SL is a battery-backed SPI Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology. It features 1 Kbit EEPROM with preprogrammed EUI-64 MAC address storage and 64 bytes of battery-backed SRAM. The device operates within an industrial temperature range of -40°C to +85°C and supports supply voltages from 1.8V to 3.6V. Key specifications include dual programmable alarms, a watchdog timer, event detect modules, and on-chip digital trimming for oscillator calibration.

Real Time Clock Feature Summary

• Integrated RTCC with calendar functionality tracking time down to hundredths of seconds, including leap year compensation through 2399.
• Includes 1 Kbit EEPROM with software write-protect and 128-bit protected area preprogrammed with an EUI-64 MAC address.
• Features dual configurable event detect modules for high-speed pulse counting and low-speed switch debouncing.
• Supports automatic switchover between VCC and VBAT with power-fail timestamp logging capabilities.

Real Time Clock Applications

• Systems requiring accurate timekeeping with non-volatile memory for unique device identification.
• Applications utilizing external mechanical switches requiring hardware-level debounce via the low-speed event detect module.
• Industrial environments needing robust timing solutions with watchdog timer integration for system reset management.

Real Time Clock Procurement Notes

Verify that the ordering suffix 'SL' corresponds to the SOIC-14 package as specified in the manufacturer's documentation. Confirm that the 'I' designation matches the required industrial temperature range of -40°C to +85°C for the specific application environment.

Real Time Clock Selection Notes

Select this component when an EUI-64 identifier is required directly within the RTC memory space. Ensure the design accommodates the 14-pin SOIC or TSSOP footprint. Verify that the host microcontroller supports SPI communication at frequencies up to 5 MHz for optimal data transfer rates.

Real Time Clock Part Context

This part belongs to the MCP795WXX family of battery-backed SPI RTCCs. It shares functional similarities with the MCP795W10 and MCP795W11 but is distinguished by its inclusion of the EUI-64 protected EEPROM block. The 'T' suffix indicates tape and reel packaging, while 'SL' denotes the SOIC-14 package type.

Real Time Clock Replacement Considerations

The MCP795W12T-I/ST serves as a direct pin-compatible alternative offering the same electrical characteristics and functionality in a TSSOP-14 package. Both parts share identical memory configurations and feature sets.