Arduino RTC_RX8025T Library v1.0.7

https://github.com/marcinsaj/RTC_RX8025T
The MIT License
Marcin Saj 25 Oct 2022

Introduction

RTC_RX8025T is an Arduino library that supports the Seiko Epson RX8025T Real Time Clock. This library is intended to be used with the Arduino Time library. RTC_RX8025T implements functions to support the Date and Time functions, interrupt output, frequency output, alarm and timer functions.

The RTC_RX8025T library is based on the Paul Stoffregen library DS3232RTC.

RTC RX8025T Module

• RX8025T Datasheet
• Project website - Datasheet
• Availability - How to get
• Arduino Library - How to use

Timekeeping accuracy

The accuracy depends on the version of the RTC module used and the operating temperature, more in the summary.

• RTC RX8025T-UA

  • ± 1.9 x 10-6 / 0 ºC to +40 ºC (Equivalent to 5 seconds of month deviation)
  • ± 3.4 x 10-6 / -40 ºC to +85 ºC (Equivalent to 9 seconds of month deviation)

• RTC RX8025T-UB

  • ± 3.8 x 10-6 / 0 ºC to +50 ºC (Equivalent to 10 seconds of month deviation)
  • ± 5.0 x 10-6 / -40 ºC to +85 ºC (Equivalent to 13 seconds of month deviation)

Library Installation

To use the RTC_RX8025T library:

• First method
  • Open Library Manager in Arduino IDE.
  • Type library name "RTC_RX8025T" and install it.
• Second method
  • Go to https://github.com/marcinsaj/RTC_RX8025T, click the Download ZIP button and save the ZIP file to a convenient location on your PC.
  • Uncompress the downloaded file. This will result in a folder containing all the files for the library, that has a name that includes the branch name, usually RTC_RX8025T-master or RTC_RX8025T-main.
  • Rename the folder to just RTC_RX8025T.
  • Copy the renamed folder to the Arduino sketchbook\libraries folder.

Examples

The following example sketches are included with the RTC_RX8025T library:

• SetDateTimeRTC_1 - Set and display the RTC date and time.
• SetDateTimeRTC_2 - Set and display the RTC date and time with the names of days of the week and months.
• InterruptRTC - Generate an interrupt by the RTC (INT output) every second or every minute and handle the interrupt.
• FrequencyRTC - Generate square wave by the RTC (FOUT output) with preset frequencies: 32.768 kHz, 1024 Hz, 1Hz.

To do:

• Alarm - not yet implemented in the library
• Timer - not yet implemented in the library

Usage notes

When using the RTC_RX8025T library, the user is responsible for ensuring that reads and writes do not exceed the device's address space (0x00-0x0F), no bounds checking is done by the library.

To use the RTC_RX8025T library, the Time and Wire libraries must also be included:

#include <RTC_RX8025T.h>  //https://github.com/marcinsaj/RTC_RX8025T
#include <TimeLib.h>      //https://github.com/PaulStoffregen/Time
#include <Wire.h>         //https://arduino.cc/en/Reference/Wire (included with Arduino IDE)