MCP795B10-I/SL

Real Time Clock Overview

The MCP795B10-I/SL is a low-power Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology, housed in a 14-lead SOIC package. It features an SPI interface with clock speeds up to 10 MHz and operates within a voltage range of 1.8V to 5.5V on VCC and 1.3V to 5.5V on VBAT. The device includes 64 bytes of battery-backed SRAM and 1 Kbit of EEPROM memory. Key functionalities include dual programmable alarms, a watchdog timer, event detection inputs, and automatic battery switchover. A distinguishing feature of the 'B' variant is the provision of a 32 kHz boot-up clock at power-up via the CLKOUT/BOOT pin.

Real Time Clock Feature Summary

• Integrated RTCC with calendar functionality supporting leap years until 2399 and dual programmable alarms.
• Includes 64-byte battery-backed SRAM and 1 Kbit EEPROM with software write protection.
• Features a dedicated 32 kHz boot-up clock output on the CLKOUT/BOOT pin upon power-up.
• Supports digital trimming/calibration with ±255 PPM range in 1 PPM steps for accuracy.

Real Time Clock Applications

• Systems requiring precise timekeeping with millisecond alarm resolution.
• Applications needing automatic logging of power failure duration via timestamp registers.
• Devices utilizing external event detection for pulse counting or switch debouncing.
• Embedded systems requiring a watchdog timer independent of the main microcontroller.

Real Time Clock Procurement Notes

Verify the specific suffix 'I/SL' corresponds to the Industrial temperature range (-40°C to +85°C) and SOIC-14 package as documented in the datasheet. Confirm that the 'B' designation is required for the 32 kHz boot-up clock feature, as the 'W' variant lacks this capability. Ensure compatibility with the 1 Kbit EEPROM capacity if higher non-volatile storage is needed.

Real Time Clock Selection Notes

Select the MCP795B10-I/SL when a boot-up clock signal is necessary during system initialization. Choose this part over the W-series if the application requires the 32 kHz output immediately after power restoration. Ensure the design accommodates the 14-pin SOIC footprint and provides external pull-ups for the open-drain WDO and IRQ pins.

Real Time Clock Part Context

This component belongs to the MCP795WXX/MCP795BXX family of SPI Real-Time Clocks. The 'B' suffix indicates the inclusion of the 32 kHz boot-up clock feature, while the '1' in the middle denotes 1 Kbit of EEPROM memory compared to the 2 Kbit option. The 'I' specifies the industrial temperature grade, and 'SL' identifies the SOIC-14 package type.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The MCP795W10-I/SL is a functional equivalent but lacks the 32 kHz boot-up clock feature found in the B-series devices.