Mikroelektronika d.o.o.
Carte à clic Magneto 12
Carte à clic Magneto 12
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Key Features:
- Applications rotatives à 360° et à course courte (360°) de haute précision, détecte deux des trois composantes du champ magnétique, sortie analogique ratiométrique, haute fiabilité, possibilité de traitement du signal sous forme analogique et numérique, et plus encore
- Basé sur le capteur de position magnétique A31315 d'Allegro Microsystems
- Peut être utilisé pour les applications de détection de position dans les applications automobiles, industrielles et grand public
- mikroBUS : interfaces I2C et analogiques
La carte Click Board™ Magneto 12 est une carte complémentaire compacte qui contient un dispositif de détection magnétique précis et fiable. Cette carte comprend l'A31315, un capteur de position magnétique conçu pour la mesure de la position de course rotative et linéaire sur et hors axe d'Allegro Microsystems. Ce capteur intègre des éléments à effet Hall verticaux et plans avec un circuit de compensation de température de précision pour détecter deux des trois composantes du champ magnétique (X et Y). Grâce au traitement du signal configurable (l'utilisateur est autorisé à traiter le signal de sortie sous forme analogique ou numérique), à la linéarisation et au calcul d'angle, l'A31315 peut résoudre avec précision la position rotative absolue (360° complet et course courte < 360°) ou linéaire d'une cible magnétique en mouvement. Cette carte Click™ convient aux applications de détection de position dans les applications automobiles, industrielles et grand public.
La carte Click™ Magneto 12 est supportée par une bibliothèque compatible mikroSDK, qui comprend des fonctions qui simplifient le développement logiciel. Cette carte Click™ est livrée sous forme de produit entièrement testé, prêt à être utilisé sur un système équipé du socket mikroBUS™.
How Does The Magneto 12 Click Board™ Work?
The Magneto 12 Click Board™ as its foundation uses the A31315, a magnetic position sensor from Allegro Microsystems. This sensor integrates vertical and planar Hall-effect elements with precision temperature-compensating circuitry to detect two out of three magnetic field components (X and Y). Using configurable signal processing, linearization, and angle calculation allows the A31315 to accurately resolve the absolute rotary (full 360° and short-stroke <360°) or linear position of a moving magnetic target.
The A31315 features a ratiometric analog interface to output the angle between the two factory-selected axes (X and Y). When using the analog mode of the A31315, the capacitance is provided for the stability of the output. A load resistor R4 also provides a known diagnostic state in a line break or device tri-state event. A series resistor R5 can be placed (default resistor value is 0Ω) before the capacitance C2 to create a low-pass filter for additional filtering and lower noise. However, caution should be taken, as this could also reduce the operating output voltage based on the ratio of the filter resistor and the load resistance.
The Magneto 12 Click Board™ possesses two ways to communicate with the MCU. The analog output signal of the A31315 can be converted to a digital value using MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip using a 2-wire I2C compatible interface, or can be sent directly to an analog pin of the mikroBUS™ socket labelled as AN. The MCP3221 provides one single-ended input with low power consumption, a low maximum conversion current, and a Standby current of 250μA and 1μA, respectively. Data can be transferred at rates of up to 100kbit/s in the Standard and 400kbit/s in the Fast Mode. Selection can be performed by onboard SMD jumper labelled as ADC SEL, setting it to an appropriate position marked as AN and ADC.
The Magneto 12 Click Board™ can be operated only with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | Magnetic |
| Applications | The Magneto 12 Click Board™ can be used for position sensing applications in automotive, industrial, and consumer applications |
| On-board modules | A31315 - magnetic position sensor from Allegro Microsystems |
| Key Features | Highly accurate 360° and short stroke (360°) rotary applications, detects two out of three magnetic field components, ratiometric analog output, high reliability, possibility of signal processing in analog and digital form, and more |
| Interface | Analog,I2C |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 5V |
PINOUT DIAGRAM
This table shows how the pinout of the Magneto 12 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Analog Signal | AN | 1 | AN | PWM | 16 | NC | |
| NC | 2 | RST | INT | 15 | NC | ||
| 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 | |
| NC | 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 | ADC SEL | Right | Output Voltage A/D Selection AN/ADC: Left position AN, Right position ADC |
MAGNETO 12 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 5 | - | V |
| Maximum Magnetic Flux Density | - | - | 1000 | G |
| Rotation Angle Range | 0 | - | 360 | deg |
| Resolution | - | 12 | - | bit |
| Operating Temperature Range | -40 | +25 | +120 | °C |
Software Support
We provide a library for the Magneto 12 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 Magneto 12 Click Board™ driver.
Key functions
-
magneto12_read_voltageThis function reads raw ADC value and converts it to proportional voltage level. -
magneto12_set_vrefThis function sets the voltage reference for Magneto 12 click driver. -
magneto12_read_angleThis function reads the sensor output voltage and converts it to angular position in degrees.
Example Description
This example demonstrates the use of the Magneto 12 Click Board™ by reading and displaying the magnet's angular position in degrees.
void application_task ( void )
{
float angle = 0;
if ( MAGNETO12_OK == magneto12_read_angle ( &magneto12, &angle ) )
{
log_printf( &logger, " Angle: %.2f degreesrnn", angle );
}
Delay_ms( 100 );
}
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.Magneto12
Additional Notes and Information
Depending on the development board you are using, you may need 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 Magneto 12 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 Magneto 12
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