MCP795B22T-I/SL

Real Time Clock Overview

The MCP795B22T-I/SL is a low-power Real-Time Clock/Calendar (RTCC) featuring an integrated watchdog timer and event detection capabilities. It operates on a 10 MHz SPI interface with a supply voltage range of 1.8V to 5.5V. The device includes 64 bytes of battery-backed SRAM, 2 Kbit of EEPROM, and a protected 128-bit Unique ID area preprogrammed with an EUI-64 MAC address. Key features include automatic battery switchover, programmable alarms, digital trimming for accuracy, and a 32 kHz boot-up clock output.

Real Time Clock Feature Summary

• Real-Time Clock/Calendar with leap year compensation and dual programmable alarms
• 2 Kbit EEPROM and 64-byte Battery-Backed SRAM with software write protection
• 128-bit Unique ID area preprogrammed with EUI-64 MAC address
• Programmable Watchdog Timer and Dual Event Detect inputs (High/Low Speed)
• 32 kHz Boot-up Clock output on CLKOUT/BOOT pin

Real Time Clock Applications

• Systems requiring precise timekeeping with millisecond alarm resolution
• Applications needing automatic power-failure timestamp logging
• Devices utilizing external hardware watchdog timers for system robustness
• Network or IoT nodes requiring unique EUI-64 identification

Real Time Clock Procurement Notes

Verify the ordering suffix 'T-I/SL' corresponds to the Tape & Reel packaging in industrial temperature grade (-40°C to +85°C). Confirm the specific variant matches the MCP795BXX series for 32 kHz boot-up functionality and EUI-64 ID presence. Cross-reference the datasheet DS22280A for final pinout and electrical specifications before integration.

Real Time Clock Selection Notes

Select this part over the MCP795WXX series if a 32 kHz clock output at power-up is required. Ensure the application utilizes an SPI interface compatible with up to 10 MHz clock speeds. Verify that the 2 Kbit EEPROM capacity meets data storage needs and that the EUI-64 ID is suitable for network addressing requirements.

Real Time Clock Part Context

This component belongs to the MCP795WXX/MCP795BXX family of RTCCs. The 'B' designation indicates support for the 32 kHz boot-up clock feature. The '22' suffix specifies 2 Kbit EEPROM and EUI-64 Unique ID. The 'I' denotes Industrial temperature range, and 'SL' indicates the SOIC package type.

Real Time Clock Replacement Considerations

The MCP795W22T-I/SL is a functional substitute lacking the 32 kHz boot-up clock feature. Other family members like MCP795B12 offer 1 Kbit EEPROM and EUI-64 IDs. Direct replacements must match the SPI interface, voltage range, and package type.