MCP795B12T-I/SL

Real Time Clock Overview

The MCP795B12T-I/SL is a low-power Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology. 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, with backup support from 1.3V to 5.5V on VBAT. The device includes 64 bytes of battery-backed SRAM and 1 Kbit of EEPROM. Key specifications include a 32 kHz boot-up clock output, dual programmable alarms, a watchdog timer, and event detect inputs. It supports industrial temperature ranges (-40°C to +85°C) and utilizes a 14-lead SOIC package.

Real Time Clock Feature Summary

• Integrated 32 kHz Boot-up Clock Output at Power-up
• 1 Kbit EEPROM with Software Block Write-Protect and 1M Endurance Cycles
• Dual Configurable Event Detect Inputs (High-Speed and Low-Speed)
• Automatic Battery Switchover with Power-Fail Time-Stamp Logging

Real Time Clock Applications

• Systems requiring accurate timekeeping during main power loss
• Applications needing millisecond-resolution alarms via SPI
• Devices utilizing external 32.768 kHz crystals for oscillator timing
• Embedded systems requiring unique ID storage for MAC addresses

Real Time Clock Procurement Notes

Verify the ordering suffix 'T' indicates tape-and-reel packaging and 'SL' denotes the SOIC-14 package. Confirm the 'I' suffix corresponds to the Industrial temperature range (-40°C to +85°C). Ensure the specific variant matches the required memory configuration (1 Kbit EEPROM) and pre-programmed Unique ID status (EUI-64) as defined in the Device Selection Table.

Real Time Clock Selection Notes

Select this component when a 32 kHz boot-up clock is required upon power application, distinguishing it from the WXX series. Choose the B12 variant specifically for its combination of 1 Kbit EEPROM and EUI-64 Unique ID. Ensure the design accommodates the 14-lead SOIC/TSSOP package constraints and provides external load capacitors for the 32,768 kHz crystal oscillator.

Real Time Clock Part Context

This part belongs to the MCP795WXX/MCP795BXX family of SPI Real-Time Clocks. The 'B' prefix identifies devices with the 32 kHz boot-up feature, while the '12' suffix specifies 1 Kbit EEPROM and EUI-64 Unique ID. The 'T' suffix typically indicates reel packaging, and 'SL' refers to the SOIC-14 package style.

Real Time Clock Replacement Considerations

Direct functional substitutes within the same family include MCP795B11-I/SL (EUI-48 ID) or MCP795B10-I/SL (Blank ID). For non-boot-up requirements, the MCP795W12T-I/SL offers identical memory and features but lacks the 32 kHz boot clock.