MCP795B11-I/ST

Real Time Clock Overview

The MCP795B11-I/ST is a low-power Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology. It features an integrated SPI interface operating up to 10 MHz, supporting industrial temperature ranges from -40°C to +85°C. The device includes 64 bytes of battery-backed SRAM and 1 Kbit of EEPROM memory with software write protection. Key functionalities include two programmable alarms, a watchdog timer, and dual event detect inputs. A distinguishing feature of the B-series is the 32 kHz boot-up clock output at power-on via the CLKOUT pin. It utilizes digital trimming for calibration and supports automatic battery switchover between VCC and VBAT supplies.

Real Time Clock Feature Summary

• Integrated 32 kHz Boot-up Clock Output on Power-Up
• 1 Kbit EEPROM and 64-Byte Battery-Backed SRAM
• Dual Programmable Alarms with Enhanced Resolution
• Programmable Watchdog Timer and Dual Event Detect Inputs

Real Time Clock Applications

• Industrial systems requiring precise timekeeping during power transitions
• Embedded devices needing millisecond-level alarm resolution
• Systems utilizing external event detection for hardware interrupts

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. Ensure that the EUI-48 unique ID requirement matches the preprogrammed specifications available for this part number. Cross-reference the datasheet revision to confirm compatibility with intended SPI communication protocols.

Real Time Clock Selection Notes

Select this component when a boot-up clock signal is required immediately upon power restoration without waiting for oscillator stabilization. Compare against the W-series variants if boot-up clock functionality is unnecessary. Confirm that the 1 Kbit EEPROM capacity meets data storage requirements and that the TSSOP-14 or SOIC-14 package fits the PCB layout constraints.

Real Time Clock Part Context

This part belongs to the MCP795WXX/MCP795BXX family of RTCCs. The 'B' designation indicates the inclusion of the 32 kHz boot-up clock feature, while the '11' suffix specifies 1 Kbit EEPROM and preprogrammed EUI-48™ MAC address capability. It shares the same core architecture as the W-series but adds the boot-time clock generation logic.

Real Time Clock Replacement Considerations

MCP795B10-I/ST: Identical features but with blank EEPROM instead of preprogrammed EUI-48. MCP795W11-I/ST: Same memory configuration but lacks the 32 kHz boot-up clock feature.