Mikroelektronika d.o.o.
Compass 7 Click Board
Compass 7 Click Board
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Key Features:
- Low power consumption, superior dynamic range and accuracy, on-chip automatic degaussing with built-in SET/RESET function, sensitivity compensation and on-chip temperature sensor, and more
- Based on the MMC5633NJL - monolithic high-performance 3-axis AMR magnetic sensor from MEMSIC
- Can be used as an electronic compass but also can be used in various position sensing applications
- mikroBUS: I2C Interface
The Compass 7 Click Board™ is a compact add-on board perfect for applications like an electronic compass. This board features the MMC5633NJL, a monolithic complete 3-axis AMR magnetic sensor with on-chip signal processing and an integrated digital bus from MEMSIC. It can measure magnetic fields within the full-scale range of ±30 Gauss (G) with up to 0.0625mG per LSB resolution at 20bits operation mode and 2mG total RMS noise level, enabling heading accuracy of ±1º in electronic compass applications. Also, an integrated SET/RESET function eliminates thermal variation-induced offset error (Null field output) and clears the residual magnetization resulting from powerful external fields. This Click board™ is suitable, as mentioned before, as an electronic compass but also can be used in various position sensing applications.
The Compass 7 Click Board™ is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.
How Does The Compass 7 Click Board™ Work?
The Compass 7 Click Board™ as its foundation uses the MMC5633NJL, a monolithic high-performance 3-axis AMR magnetic sensor from MEMSIC. It has an integrated drive circuit, signal processing circuit, and serial interface block, allowing low noise and high resolution. It can measure magnetic fields within the full-scale range of ±30 Gauss (G) with up to 0.0625mG per LSB resolution at 20bits operation mode and 2mG total RMS noise level, enabling heading accuracy of ±1º in electronic compass applications.
An integrated SET/RESET function eliminates errors due to Null Field output change with temperature. In addition, it clears the sensors of any residual magnetic polarization resulting from exposure to strong external magnets. The SET/RESET function can be performed periodically for each measurement as the specific application requires.
The Compass 7 Click Board™ communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 400kHz, fully adjustable through software registers. The MMC5633NJL does not require a specific Power-Up sequence but requires a voltage of 1.8V for its interface and logic part to work correctly. Therefore, a small regulating LDO is used, the MAX8511, providing a 1.8V out of mikroBUS™ power rails. Since the sensor for operation requires a power supply of 1.8V, this Click board™ also features the PCA9306 voltage-level translator allowing the MMC5633NJL to work with 3.3V and 5V MCU properly.
The Compass 7 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 | Compass, Magnetic |
| Applications | It can be used as an electronic compass but also can be used in various position sensing applications |
| On-board modules | MMC5633NJL - monolithic high-performance 3-axis AMR magnetic sensor from MEMSIC |
| Key Features | Low power consumption, superior dynamic range and accuracy, on-chip automatic degaussing with built-in SET/RESET function, sensitivity compensation and on-chip temperature sensor, and more |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the Compass 7 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 | 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 | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ON-BOARD 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 |
COMPASS 7 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Field Range (Each Axis) | - | ±30 | - | G |
| Accuracy | - | ±1 | - | Deg |
| Resolution | - | 20 | - | bits |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Compass 7 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 the MikroE Github account.
Library Description
This library contains an API for Compass 7 Click driver.
Key functions
-
compass7_set_measurement_modeThis function sets the control and ODR registers for the selected measurement mode. -
compass7_get_magnetic_fluxThis function reads the raw values of the X, Y, and Z-axis and converts them to magnetic flux data in Gauss. -
compass7_get_temperatureThis function reads the temperature measurements in Celsius.
Example Description
This example demonstrates the use of the Compass 7 Click Board™ by reading and displaying the magnetic field strength of the 3-axis and the temperature measurements in Celsius.
void application_task ( void )
{
compass7_magnetic_flux_t magnetic_flux;
float temperature;
if ( ( COMPASS7_OK == compass7_set_measurement_mode ( &compass7, COMPASS7_MEAS_SINGLE_M ) ) &&
( COMPASS7_OK == compass7_get_magnetic_flux ( &compass7, &magnetic_flux ) ) )
{
log_printf ( &logger, " X: %.2f Grn", magnetic_flux.x_axis );
log_printf ( &logger, " Y: %.2f Grn", magnetic_flux.y_axis );
log_printf ( &logger, " Z: %.2f Grn", magnetic_flux.z_axis );
}
if ( ( COMPASS7_OK == compass7_set_measurement_mode ( &compass7, COMPASS7_MEAS_SINGLE_T ) ) &&
( COMPASS7_OK == compass7_get_temperature ( &compass7, &temperature ) ) )
{
log_printf ( &logger, " Temperature: %.2f Crnn", temperature );
}
Delay_ms ( 100 );
}
The complete 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 the MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Compass7
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 MikroElektronika compilers.
MIKROSDK
The Compass 7 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.
Compass 7 Click Board
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