Mikroelektronika d.o.o.
Carte à clic RTC 17
Carte à clic RTC 17
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Key Features:
- Basé sur le RV5C387A, une horloge CMOS en temps réel avec une fonction de génération d'interruption intégrée de Nisshinbo Micro Devices Inc
- Faible consommation d'énergie, alarme périodique programmable avec capacité d'interruption, fonction horloge/calendrier, batterie de secours, sortie d'horloge 32 kHz, reconnaissance automatique des années bissextiles jusqu'en 2099, et plus encore
- Peut être utilisé pour diverses applications de chronométrage, y compris les alarmes quotidiennes, les applications de comptage et d'autres nécessitant un RTC précis pour leur fonctionnement
- mikroBUS : interface I2C
La carte RTC 17 Click Board™ est une carte complémentaire compacte qui permet de conserver l'heure exacte d'une journée. Cette carte est équipée de la RV5C387A, une horloge CMOS en temps réel avec une fonction de génération d'interruption intégrée de Nisshinbo Micro Devices Inc, pour effectuer la transmission série des données d'heure et de calendrier au MCU. La RV5C387A fournit des informations telles que l'année, le mois, le jour, le jour de la semaine, les heures, les minutes et les secondes sur la base d'un cristal de quartz de 32,768 kHz via une interface série I2C pour transmettre les données d'heure et de calendrier au MCU. Elle dispose également d'une fonction d'alarme qui envoie un signal d'interruption au MCU lorsque le jour de la semaine, l'heure ou la minute correspond à l'heure prédéfinie. Cette carte Click board™ convient à diverses applications de chronométrage, notamment les alarmes quotidiennes, les applications de mesure et d'autres applications nécessitant un RTC précis pour leur fonctionnement.
La carte RTC 17 Click Board™ est supportée par une bibliothèque compatible mikroSDK, qui comprend des fonctions qui simplifient le développement logiciel. Cette carte Click Board™ est livrée sous la forme d'un produit entièrement testé, prêt à être utilisé sur un système équipé du socket mikroBUS™.
How Does The RTC 17 Click Board™ Work?
The RTC 17 Click Board™ as its foundation uses the RV5C387A, an I2C configurable real-time clock/calendar optimized for low power operations from Nisshinbo Micro Devices Inc. The RV5C387A is configured to transmit calendar and time data to the MCU and comes with an integrated interrupt generation function. It reads and writes time data from and to the MCU in units ranging from seconds to the last two digits of the calendar year. The calendar year will automatically be identified as a leap year when its last two digits are a multiple of 4. Consequently, leap years up to the year 2099 can automatically be recognized.
The RTC 17 Click Board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting a Fast Mode operation up to 400kHz. It also incorporates an alarm circuit configured to generate an interrupt signal to the INT pin of the mikroBUS™ socket from its A, B, or C interrupt pin at preset times. The alarm circuit allows two types of alarm settings specified by the Alarm_W registers and the Alarm_D registers.
The Alarm_W registers (interrupt B) allow a week, hour, and minute alarm settings, including combinations of multiple day-of-week settings such as Monday, Wednesday, while the Alarm_D registers (interrupt C) allow an hour and minute alarm settings. Besides, the RV5C387A can generate periodic interrupt signals aside from interrupt signals generated by the alarm circuit from interrupt A pin. The RTC 17 Click Board™ also has an onboard header labelled CLKO, which provides clock pulses of 32kHz.
The most common RTC configuration, like this one, is a battery-backed up, which maintains time and continues its work without interruption in the event of a power failure. That's why, in addition to the BU9873, the RTC 17 Click Board™ is equipped with a button cell battery holder compatible with the 3000TR battery holder, suitable for 12mm Coin Cell batteries.
The RTC 17 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library that contains easy-to-use functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | RTC |
| Applications | The RTC 17 Click Board™ can be used for various time-keeping applications, including daily alarms, metering applications, and others requiring an accurate RTC for their operation |
| On-board modules | RV5C387A - I2C configurable real-time clock/calendar optimized for low power operations from Nisshinbo Micro Devices Inc |
| Key Features | Low power consumption, programmable periodic and alarm with interrupt capability, clock/calendar feature, battery back-up, 32kHz clock output, automatic leap year recognition up to the year 2099, and more |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the RTC 17 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | INT | Interrupt | |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| R8 | A | Unpopulated | Interrupt A Signal Jumper |
| R7 | B | Populated | Interrupt B Signal Jumper |
| R6 | C | Unpopulated | Interrupt C Signal Jumper |
| J1 | CLKO | Unpopulated | 32kHz Clock Output Header |
RTC 17 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Clock Output CLKO | - | 32 | - | kHz |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the RTC 17 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on MikroE Github account.
Library Description
This library contains API for the RTC 17 Click Board™ driver.
Key functions
-
rtc17_set_timeThis function sets the starting time values - second, minute and hour. -
rtc17_read_timeThis function reads the current time values - second, minute and hour. -
rtc17_read_dateThis function reads the current date values - day of week, day, month and year.
Example Description
This example demonstrates the use of the RTC 17 Click Board™ by reading and displaying the time and date values.
void application_task ( void )
{
// Wait for interrupt which is synchronized with second count-up
while ( rtc17_get_int_pin ( &rtc17 ) );
rtc17_clear_interrupts ( &rtc17 );
if ( RTC17_OK == rtc17_read_time ( &rtc17, &time ) )
{
log_printf( &logger, " Time: %.2u:%.2u:%.2urn",
( uint16_t ) time.hour, ( uint16_t ) time.minute, ( uint16_t ) time.second );
}
if ( RTC17_OK == rtc17_read_date ( &rtc17, &date ) )
{
log_printf( &logger, " Date: %s, %.2u.%.2u.20%.2u.rnn",
rtc17_get_day_of_week_name ( date.day_of_week ),
( uint16_t ) date.day, ( uint16_t ) date.month, ( uint16_t ) date.year );
}
}
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.RTC17
Additional Notes and Information
Depending on the development board you are using, you may need a USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.
MIKROSDK
The RTC 17 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Carte à clic RTC 17
Frequently Asked Questions
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