Mikroelektronika d.o.o.
Carte à clic RTC 19
Carte à clic RTC 19
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Key Features:
- Faible consommation d'énergie, commutateur d'alimentation de secours automatique, interrupteur d'alimentation intégré, haute précision, fonction horloge/calendrier, interruption programmable et sortie d'horloge, reconnaissance automatique des années bissextiles, etc.
- Basé sur le MAX31334 - horloge en temps réel d'Analog Devices
- Peut être utilisé pour des applications grand public, y compris les alarmes quotidiennes, les applications de comptage et autres nécessitant un RTC précis pour leur fonctionnement
- mikroBUS : interface I2C
La carte RTC 19 Click Board™ est une carte complémentaire compacte qui mesure le temps qui passe. Cette carte est équipée du MAX31334, une horloge en temps réel configurable en I2C avec un interrupteur d'alimentation intégré d'Analog Devices. Le MAX31334 fournit des informations telles que les secondes, les minutes, les heures, les jours, les mois, les années et les dates basées sur un cristal de quartz de 32,768 kHz via une interface série I2C pour transmettre les données de temps et de calendrier au MCU. Il 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, ainsi que d'une sortie d'onde carrée programmable, d'une entrée de détection d'événement avec horodatage et d'une alimentation de secours. Cette carte Click board™ convient aux applications grand public, notamment les alarmes quotidiennes, les applications de mesure et autres nécessitant un RTC précis pour leur fonctionnement.
La carte RTC 19 Click Board™ est prise en charge par une bibliothèque compatible mikroSDK, qui comprend des fonctions qui simplifient le développement logiciel. Cette carte Click Board™ est un produit entièrement testé, prêt à être utilisé sur un système équipé du socket mikroBUS™.
How Does The RTC 19 Click Board™ Work?
The RTC 19 Click Board™ is based on the MAX31334, an ultra-low power, real-time clock (RTC) time-keeping device from Analog Devices. The MAX31334 is configured to transmit calendar and time data to the MCU (24-hour/12-hour format) based on a 32.768kHz quartz crystal and comes with an integrated interrupt generation function. It reads and writes clock/calendar data from and to the MCU in units ranging from seconds to the last two digits of the calendar year, providing seconds, minutes, hours, days, months, year, and date information. The end-of-the-month date is automatically adjusted for months with fewer than 31 days, including corrections for the leap year.
The MAX31334 features an integrated high-side power pass switch (detectable through a PSW pin and drawn to the TP1 testpoint for external use), enabling idle, ultra-low power modes on duty-cycled applications by disconnecting power to other devices on the system. The power switch ON/OFF durations can be controlled by periodic interrupt sources such as a countdown timer (programmable from 100ms to 1hr), alarms (1s resolution), or by an external interrupt from a DIN pushbutton.
The DIN signal represents a digital Schmitt trigger that records timestamps or asserts an interrupt on its falling/rising edge. In addition to the DIN button, the state of this signal can also be changed digitally using the DIN pin, routed on the RST pin of the mikroBUS™ socket. The selection can be performed using an onboard SMD jumper labelled DIN SEL, placing it in an appropriate position marked as MB or T, where MB stands for mikroBUS and T for the button.
The RTC 19 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 circuitry configured to generate a time-of-day/date interrupt signal. An alarm (interrupt) signal, marked as INA and routed to the INT pin of the mikroBUS™ socket, allows outputting warning every day or on a specific day visually indicated by a red LED marked as ALARM.
By utilizing an automatic backup switch, when the main supply drops below the programmed threshold voltage, this RTC can use an external power source (220mF supercapacitor), allowing uninterrupted operation. Besides an automatic backup switchover circuit, this board also carries a header for additional alarm/interrupt and a programmable clock output signal for frequencies from 1Hz to 32kHz available on an onboard J1 header. In addition, this signal also exists on the AN pin of the mikroBUS™ socket marked with INTB.
The RTC 19 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 containing easy-to-use functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | RTC |
| Applications | It can be used for general-consumer applications, including daily alarms, metering applications, and others requiring an accurate RTC for their operation |
| On-board modules | MAX31334 - real-time clock from Analog Devices |
| Key Features | Low power consumption, automatic backup supply switch, integrated power switch, high accuracy, clock/calendar feature, programmable interrupt and clock output, automatic leap year recognition, 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 19 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Clock/Alarm Interrupt B | INB | 1 | AN | PWM | 16 | PSW | Power Switch |
| Schmitt Trigger | DIN | 2 | RST | INT | 15 | INA | Alarm Interrupt A |
| 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 |
| LD2 | ALARM | - | Alarm LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| JP2 | DIN SEL | Right | Schmitt Trigger Selection MB/T: Left position MB, Right position T |
| J1 | J1 | Unpopulated | Programmable Clock/Interrupt Output Header |
| T1 | DIN | - | External Trigger Button |
RTC 19 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Memory Size (RAM) | - | - | 32 | bytes |
| Clock Output | 1 | - | 32 | kHz |
Software Support
We provide a library for the RTC 19 Click Board™ and a demo application (example), developed using MikroE compilers. The demo can run on all the main MikroE development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager(recommended), downloaded from our LibStock™ or found on the MikroE Github account.
Library Description
This library contains API for the RTC 19 Click Board™ driver.
Key functions
-
rtc19_set_timeThis function sets the starting time values - second, minute and hour. -
rtc19_read_timeThis function reads the current time values - second, minute and hour. -
rtc19_read_dateThis function reads the current date values - day of week, day, month and year.
Example Description
This example demonstrates using the RTC 19 Click Board™ by reading and displaying the time and date values.
void application_task ( void )
{
// Wait for a timer countdown flag configured at 1 Hz
while ( rtc19_get_inta_pin ( &rtc19 ) );
Delay_ms ( 100 );
rtc19_clear_interrupts ( &rtc19 );
if ( RTC19_OK == rtc19_read_time ( &rtc19, &time ) )
{
log_printf( &logger, " Time: %.2u:%.2u:%.2urn",
( uint16_t ) time.hour, ( uint16_t ) time.minute, ( uint16_t ) time.second );
}
if ( RTC19_OK == rtc19_read_date ( &rtc19, &date ) )
{
log_printf( &logger, " Date: %s, %.2u.%.2u.20%.2u.rn",
rtc19_get_day_of_week_name ( date.day_of_week ),
( uint16_t ) date.day, ( uint16_t ) date.month, ( uint16_t ) date.year );
}
}
The complete application code and ready-to-use projects can be installed directly from NECTO Studio The package Manager(recommended) is downloaded from our LibStock™ or found on the MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.RTC19
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, 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 MikroE compilers.
MIKROSDK
The RTC 19 Click Board™ is supported with mikroSDK - MikroE 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 19
Frequently Asked Questions
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