MCP795B12-I/SL

Real Time Clock Overview

The MCP795B12-I/SL is a low-power SPI Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology. It features 1 Kbit EEPROM, 64 bytes of battery-backed SRAM, and a preprogrammed EUI-64 Unique ID. The device supports industrial temperature ranges (-40°C to +85°C) and operates on VCC from 1.8V to 5.5V, with VBAT support down to 1.3V. Key electrical parameters include standby current under 1µA at 3V and backup timekeeping current under 700nA at 1.8V. It includes a programmable watchdog timer, dual event detect inputs, and automatic battery switchover with power-fail timestamping.

Real Time Clock Feature Summary

• Integrated 1 Kbit EEPROM and 64-byte battery-backed SRAM for non-volatile data storage.
• Preprogrammed 128-bit EUI-64 Unique ID in protected EEPROM area.
• 32 kHz boot-up clock output on CLKOUT/BOOT pin upon power-up.
• Digital trimming/calibration with +/- 255 PPM range in 1 PPM steps.

Real Time Clock Applications

• Systems requiring millisecond-resolution alarms via SPI interface.
• Applications needing automatic logging of power failure duration.
• Devices utilizing external mechanical switches with debounce filtering.
• Embedded systems requiring independent watchdog timer functionality.

Real Time Clock Procurement Notes

Verify the specific suffix 'I/SL' against the manufacturer's latest documentation to confirm package type (SOIC-14) and temperature grade. Ensure the EUI-64 ID requirement matches the preprogrammed variant, as blank ID options exist in other part numbers within the family.

Real Time Clock Selection Notes

Select this model over the WXX series if a 32 kHz boot-up clock signal is required immediately after power application. Confirm that the 1 Kbit EEPROM capacity meets system storage needs, as 2 Kbit variants are available. Verify SPI voltage levels align with the host microcontroller's I/O specifications across the 1.8V to 5.5V operating range.

Real Time Clock Part Context

This component belongs to the MCP795WXX/MCP795BXX family of SPI RTCCs. The 'B' designation indicates the inclusion of the 32 kHz boot-up clock feature, distinguishing it from the 'W' series. The '12' suffix specifies 1 Kbit EEPROM and EUI-64 ID, while 'I/SL' denotes Industrial temperature range and SOIC-14 packaging.

Real Time Clock Replacement Considerations

MCP795W12-I/SL: Identical memory and ID but lacks the 32 kHz boot-up clock feature. MCP795B11-I/SL: Same boot-up clock but offers 1 Kbit EEPROM with EUI-48 ID instead of EUI-64. MCP795B22-I/SL: Provides 2 Kbit EEPROM with EUI-64 ID and boot-up clock.