Real-Time Clock/Calendar


A Feature-Rich, Low-Cost Timekeeping Solution

Microchip supports a wide range of Real-Time Clocks from basic low-cost devices to a variety of mid-range devices that are highly integrated with a usable amount of non-volatile memory and a combination of features that are very effective when operating within a single battery backed clock device. With, both I2C and SPI RTCCs available, various applications can be supported at a price that is lower than competitive devices with fewer features and lower performance.

Innovative Peripherals

  • Battery switchover with a power fail time stamp
  • Wide digital trimming range
  • Watchdog Timer with dual retriggers
  • Event Detect inputs with a programmable debounce
  • Unique ID with a user unlock

Easy to Implement

  • I2C & SPI interfaces
  • Industry Standard Pinouts
    • I2C – 8 pins
    • SPI – 14 pins
  • Microchip standard development boards

3 Memory Options

  • SRAM
  • Unique ID / MAC Address

Features: RTCC


Typical Low-End RTCC Plus Microchip's Enhanced Features


Features: I2C RTCC


I2C™ RTCC Block Diagram I2C RTCC Products


Features: SPI RTCC


SPI RTCC Block Diagram
SPI RTCC Products



How do you plan to use the Real-Time Clock/Calendar in your application or design? Here are some examples of how RTCC Technology can take your applications to bigger and better places.

  • Smart Energy
    Smart Energy applications can use a real-time clock with a MAC address for wired and wireless communications with other devices.
  • Utility Metering
    Digital trimming in the real-time clock can be used to perform software temperature compensation for more accurate time.
  • Ethernet
    The EUI-48™ or EUI-64™ MAC Address in the RTCC can provide any Ethernet enabled application with its own unique identification.
  • LCD
    The time of day and date from a real-time clock is regularly displayed on the LCD in many systems.

Getting Started

Without Battery back-up the RTCC's recorded time would reset when the system loses power. Battery back-up allows the RTCC to switch over to an alternative power source when system power is not available. The alternative source powers the time keeping counters, oscillator circuitry and alarm circuits during this period, allowing the RTCC to continue to operate. Lithium coin cell batteries are often used as the alternative power source due to their low cost, widespread availability and convenient cell voltage.

The communications portion of the RTCC is disabled when operating from the alternative power source. By disabling the communications portion of the RTCC the current consumption is lowered allowing for longer operation from a disposable battery.


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