MCP795W11T-I/ST

Real Time Clock Overview

The MCP795W11T-I/ST 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 a 1 Kbit EEPROM, 64 bytes of SRAM, and a 128-bit protected EEPROM area preprogrammed with an EUI-48 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 RTCC with leap year compensation through 2399 and digital trimming for ±259 ppm accuracy
• Memory includes 1 Kbit EEPROM, 64-byte battery-backed SRAM, and 128-bit protected EEPROM with EUI-48 address
• Dual configurable event detect modules for high-speed pulse counting and low-speed switch debouncing
• Automatic switchover between VCC and VBAT with power-fail timestamp logging

Real Time Clock Applications

• Industrial systems requiring robust timekeeping and data retention during power loss
• Embedded devices needing unique hardware identification via preprogrammed EUI-48 addresses
• Applications utilizing external watchdog timers or alarm interrupts for system monitoring

Real Time Clock Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the specific revision level (DS20002280E) matches design requirements. Ensure the industrial grade (-I) rating aligns with the operational temperature constraints of the target environment.

Real Time Clock Selection Notes

Select this model over the MCP795W10 if a permanent EUI-48 identifier is required. Choose the TSSOP-14 package variant for surface-mount applications. Consider the MCP795W2X series if 2 Kbit EEPROM capacity is necessary instead of the 1 Kbit provided in the W1X family.

Real Time Clock Part Context

This component belongs to the MCP795WXX family of battery-backed SPI RTCCs. The 'W11' designation specifically denotes the 1 Kbit EEPROM configuration combined with the EUI-48 protected memory block. The 'T' suffix differentiates the reel packaging from the standard tube packaging found in non-T variants.

Real Time Clock Replacement Considerations

Direct functional substitutes within the same package include the MCP795W11-I/ST, differing only in packaging format. For designs requiring higher EEPROM density, the MCP795W21-I/ST serves as a compatible upgrade.