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Real-Time Clocks
Feature-Rich, Low-Cost Timekeeping Solutions
Why Choose Our RTCCs?
Innovative Peripherals
- Battery switchover with power-fail timestamp
- Wide digital trimming range
- Watchdog timer with dual retriggers
- Event detect inputs with a programmable debounce
- Unique ID with a user unlock sequence
Easy to Implement
- I2C and SPI interfaces
- Industry-standard pinouts
- I2C: 8 pins
- SPI: 10 or 14 pins
- RTCC-specific daughter boards that work with our standard development platforms
Three Memory Options
- Battery-backed SRAM
- Nonvolatile EEPROM
- Protected EEPROM area
- Preprogrammed with unique EUI-48™ or EUI-64™ MAC address
Find the Right RTCC for Your Design
I2C RTCC Features, Options and Block Diagram
Timing Features
- Hours, minutes, seconds
- Day of the week, day, month and year
- Dual alarms: Single IRQ Out using VCC or VBAT
- Programmable clock: 1 Hz to 32 kHz using VCC
- Digital trimming from −127 ppm* to +127 ppm
- Up to 11 seconds/day
- Timestamp at battery switchover
- VCC to VBAT
- VBAT to VCC
*NOTE: 1 ppm ≈ 86 milliseconds/day
Memory Options
- 64 bytes SRAM
- 1 Kbits SEEPROM
- 64 bits Unique ID
- 0 = Blank
- 1 = EUI-48 MAC address
- 2 = EUI-64 MAC address
Voltage and Current
- Main power (oscillator running)
- VCC = 1.8V to 5.5V
- ICC = < 5 μA
- Battery backup (timekeeping and RAM)
- VBAT = 1.3V to 5.5V
- IBAT = < 700 nA
- Battery backup (timekeeping and RAM)
SPI RTCC Features, Options and Block Diagram
Timing Features
- Hours, minutes, seconds
- Alarm down to 0.01 seconds
- Day of the week, day, month and year
- Dual alarms: Single IRQ Out using VCC or VBAT
- Programmable clock out: 1 Hz to 32 kHz using VCC
- 32 kHz boot clock at power up (MCP795BXX)
- Digital trimming from −255 ppm* to +255 ppm
- Up to 22 seconds/day
- Timestamp at battery switchover
- VCC to VBAT
- VBAT to VCC
- Watchdog timer
- SPI retrigger
- I/O retrigger
*NOTE: 1 ppm ≈ 86 milliseconds/day
Memory Options
- 64 bytes SRAM
- 2 Kbits or 1 Kbits EEPROM
- 128 bits Unique ID
- 0 = Blank
- 1 = EUI-48 MAC address
- 2 = EUI-64 MAC address
Voltage and Current
- Main power (oscillator running)
- VCC = 1.8V to 5.5V
- ICC = < 1 μA
- Battery backup (timekeeping and RAM)
- VBAT = 1.3V to 5.5V
- IBAT = < 700 nA
How Can You Use an RTCC in Your Application?
Smart Energy
Use an RTCC with a MAC address to enable wired and wireless communications between devices in smart energy applications.
Utility Metering
Use digital trimming in the RTCC to perform software temperature compensation for more accurate timekeeping in utility metering applications.
Ethernet
Provide any Ethernet application with its own unique identification using the RTCC’s EUI-48 or EUI-64 MAC address.
Documentation
Application Notes
Demo and Evaluation Boards
The MCP7941X PICtail™ Plus Daughter Board demonstrates the features and abilities of the MCP7941X I²C™ Real-Time Clock/Calendar (RTCC) family in standard development platforms.
The MCP795XX RTCC PICtail™ Plus Daughter Board demonstrates the features and abilities of the MCP795XX SPI Real-Time Clock/Calendar (RTCC) family in standard development platforms.
PICtail™ Plus Expansion Board is an accessory that enables interfacing of PICtail™ Plus Daughter Cards to Explorer 16/32 development board.
The Explorer 16/32 Development Board is a low-cost modular development system for Microchip's 16-bit and 32-bit microcontrollers. It supports devices from the PIC24F, dsPIC®, and PIC32 families, with processor Plug-In Modules (PIMs) for easy device swapping. It includes a PICtail™ Plus daughter card connector for adding new functionalities.
Additional Clock and Timing Technologies
Whatever your complex timing requirements are, we offer a comprehensive portfolio of technologies, services, and solutions to help you build more reliable systems. Visit our Clock and Timing page to learn more about our atomic clocks, buffers, crystals, oscillators and other timing products.