SeeedStudio Grove RTC

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  1. Vcc: 3.3 V to 5.5 V
  2. Battery voltage: 2.0V to 3.5 V
  3. ROHS: YES
  4. I2C serial interface
  5. Programmable square-wave output signal
  6. 56-byte, battery-backed, NV RAM for data storage
  7. Automatic power-fail detect and switch circuitry
  8. Counting of time intervals valid up to 2100
  9. Consumes less than 500nA in battery-backup mode


165.00 299.00 incl. GST

Do you want a Real-Time Clock (RTC)? We have Grove – High Precision RTC v1.2 especially for you. It is an upgraded version of version 1.1. The RTC module is a member of Twig. It is based on the clock chip DS1307 which supports the I2C protocol. It uses a Lithium cell battery (CR1225). You may wonder why you would want to use an RTC module when the mbed already has a built-in RTC. The primary reason is that the mbed consumes 27-30uA from the RTC battery whereas the DS1307 consumes only 300-500nA while on battery.

The clock/calendar in the RTC provides seconds, minutes, hours, day, date, month, and year. The end of the month date is automatically adjusted for months with fewer than 31 days. It also includes the corrections for leap years. The clock operates in either 24-hour or 12-hour format with AM/PM indicator. And, it is valid up to 2100.

For all Grove users (especially beginners), Seeed Studio provides guidance PDF documents. Please download and read through Preface – Getting Started and Introduction to Grove before using the product. Applications of the RTC are digital still camera, digital video camera, printers, copy machines, battery powered devices, etc. This is a suitable product for not only Grove users but also all electronics enthusiasts. So, why wait? Buy now!


1. Battery is not included with this product.

2. In order to gain a robust performance, you must put a 3-Volt CR1225 lithium cell or its compatible Panasonic CR2032 3V Lithium Coin Battery in the battery-holder. If you use the primary power only, the module may not work normally, because the crystal may not oscillate.


  1. PCB Size: 4.0 cm x 2.4 cm
  2. Counting of seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100
  3. 56-byte, battery-backed, non-volatile (NV) RAM for data storage
  4. I2C serial interface
  5. Programmable square-wave output signal
  6. Automatic power-fail detect and switch circuitry
  7. Consumes less than 500nA in battery-backup mode with oscillator running
  8. Ready-to-go Arduino libraries
  9. Compatible platform: Arduino, BeagleBone Green, BeagleBone Green Wireless, etc.

Useful links:


Package Includes:

1 x Grove – RTC v1.2

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