Mikroelektronika d.o.o.
Altitude 5 Click Board
Altitude 5 Click Board
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Das Altitude 5 Click Board™ ist eine kompakte Zusatzplatine, die hochauflösende barometrische Druckmessungen ermöglicht. Diese Platine enthält den KP236, einen analogen barometrischen Luftdrucksensor basierend auf einem kapazitiven Prinzip von Infineon Technologies. Der KP236 wurde in erster Linie zur Messung des barometrischen Luftdrucks entwickelt, kann aber auch in anderen Anwendungsbereichen eingesetzt werden. Seine Oberfläche ist mikrobearbeitet und mit einer monolithisch integrierten Signalaufbereitungsschaltung ausgestattet, die in BiCMOS-Technologie implementiert ist. Die kalibrierte Übertragungsfunktion wandelt den Druck in ein analoges Ausgangssignal in einem Bereich von 40 kPa bis 115 kPa um. Die Wahl der Signalverarbeitung liegt jedoch beim Benutzer; genauer gesagt kann der Benutzer das Ausgangssignal in analoger oder digitaler Form verarbeiten.
Aufgrund der hohen Genauigkeit und Empfindlichkeit des KP236 eignet sich das Altitude 5 Click Board™ für fortschrittliche Automobilanwendungen sowie Industrie- und Verbraucheranwendungen.
How Does The Altitude 5 Click Board™ Work?
The Altitude 5 Click Board™ is based on the KP236, a high-resolution analog barometric air pressure sensor based on a capacitive principle from Infineon Technologies. The KP236 surface is micro-machined with a monolithic integrated signal conditioning circuit implemented in BiCMOS technology that can measure pressure in a range from 40kPa up to 115kPa with an accuracy of ±1Pa over a wide operating temperature range at the industry's lowest power. The KP236 is primarily developed for measuring barometric air pressure but can also be used in other application fields.
The pressure is detected by an array of capacitive surface micro-machined sensor cells. The sensor cell output is amplified, temperature-compensated, and linearized to obtain an output voltage proportional to the applied pressure. The transfer function for linearization is computed in the digital part of the sensor using a third-order polynomial calculation. The sensor converts pressure into an analog output signal; more precisely, the user can process the output signal in analog or digital form.
The analog output voltage of the KP236 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 labeled as AN. Selection can be performed by onboard SMD jumper labeled as ADC SEL to an appropriate position marked as AN and I2C. Using MCP3221 and I2C interface, data transfers at rates of up to 100kbit/s in the Standard and 400kbit/s in the Fast Mode.
Since the sensor for operation requires a 5V logic voltage level only, the Altitude 5 Click Board™ also features the PCA9306 voltage-level translator from Texas Instruments. The I2C interface bus lines are routed to the dual bidirectional voltage-level translator, allowing this Click board™ to work with both 3.3V and 5V MCUs properly.
The Altitude 5 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VIO 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 | Pressure |
| Applications | Can be used for advanced automotive applications and industrial and consumer applications |
| On-board modules | KP236 - high-resolution analog barometric air pressure sensor based on a capacitive principle from Infineon Technologies |
| Key Features | High precision pressure measurements, high accuracy, automotive qualified, wide temperature range, possibility of signal processing in analog and digital form, and more |
| Interface | Analog,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 on the Altitude 5 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 | |
| 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 | VIO SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| JP2 | ADC SEL | Right | Output Voltage A/D Selection AN/I2C: Left position AN, Right position I2C |
ALTITUDE 5 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Ambient Operating Pressure Range | 40 | - | 115 | kPa |
| Maximum Output Current | - | - | 1 | mA |
| Accuracy | -1 | - | 1 | kPa |
| Sensitivity | - | 53.3 | - | mV/kPa |
| Operating Temperature Range | -40 | +25 | +125 | °C |
Software Support
We provide a library for the Altitude 5 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 Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe Github account.
Library Description
This library contains API for the Altitude 5 Click Board™driver.
Key functions
-
altitude5_get_altitudeAltitude 5 get altitude function. -
altitude5_get_pressureAltitude 5 get pressure function. -
altitude5_get_adc_voltageAltitude 5 get ADC voltage function.
Example Description
This library contains API for the Altitude 5 Click Board™ driver. The demo application reads ADC value, calculate pressure and altitude.
void application_task ( void )
{
static float pressure;
static float altitude;
altitude5_get_pressure( &altitude5, &pressure );
log_printf( &logger, " Pressure : %.2f mBar rn", pressure );
Delay_ms( 100 );
altitude5_get_altitude( &altitude5, &altitude );
log_printf( &logger, " Altitude : %.2f m rn", altitude );
log_printf( &logger, "----------------------------rn" );
Delay_ms( 1000 );
}
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe Github account.
Other Mikroe Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Altitude5
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 Altitude 5 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.
Altitude 5 Click Board
Frequently Asked Questions
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