MCP795W20T-I/ST

Real Time Clock Overview

The MCP795W20T-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 supply voltages from 1.8V to 3.6V. The device integrates 2 Kbit EEPROM, 64 bytes of SRAM, and dual programmable alarms. Key features include automatic power-fail switchover, digital trimming for oscillator accuracy, and two configurable event detect modules. It utilizes a 32.768 kHz crystal or external clock input and communicates via an SPI interface with clock rates up to 5 MHz.

Real Time Clock Feature Summary

• Real-Time Clock/Calendar with leap year compensation through 2399
• Integrated 2 Kbit EEPROM and 64-byte battery-backed SRAM
• Dual Configurable Event Detect Modules (High-Speed and Low-Speed)
• Programmable Watchdog Timer with dedicated output pin

Real Time Clock Applications

• Industrial systems requiring accurate timekeeping over wide temperature ranges
• Battery-powered devices needing low-power data retention
• Systems utilizing SPI interfaces for microcontroller integration
• Applications requiring hardware-based watchdog timer functionality

Real Time Clock Procurement Notes

Verify the 'T' suffix in the part number against official documentation to confirm tape-and-reel packaging specifications. Ensure the industrial grade (-I) matches the required operating temperature range of -40°C to +85°C. Confirm that the 14-lead TSSOP package dimensions align with the target PCB layout constraints.

Real Time Clock Selection Notes

Select this component when 2 Kbit non-volatile storage is required alongside real-time clock functions. The MCP795W20 differs from the MCP795W10 by offering double the EEPROM capacity. Consider the integrated event detect modules if switch debouncing or pulse counting is needed without additional microcontroller overhead.

Real Time Clock Part Context

This part belongs to the MCP795WXX family of battery-backed SPI RTCCs. It shares functional similarities with the MCP795BXX series but utilizes SPI instead of I2C. The 'W' designation indicates the specific memory configuration and feature set associated with the W-series variants within the Microchip portfolio.

Real Time Clock Replacement Considerations

The MCP795W10T-I/ST serves as a direct substitute if only 1 Kbit EEPROM is sufficient. For I2C interface requirements, the MCP7940N-I/ST is an alternative, though it lacks the advanced event detect modules and has different pinout characteristics.