Mikroelektronika d.o.o.
Panneau de clic à pression 19
Panneau de clic à pression 19
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Key Features:
- Faible consommation d'énergie, haute précision, principe de détection piézorésistif, fonction de compensation de température intégrée, permet de traiter le signal de sortie sous forme analogique ou numérique, système dans un package, calibré en usine, etc.
- Basé sur le MLX90817 - capteur de pression absolue de Melexis Technologies
- Peut être utilisé pour les mesures de pression dans les secteurs automobile, industriel et grand public
- mikroBUS : interfaces I2C et analogiques
La carte Click Board™ Pressure 19 est une carte complémentaire compacte qui contient un capteur de pression monté sur carte. Cette carte comprend le MLX90817, un capteur de pression absolue étalonné en usine délivrant une sortie analogique ratiométrique de Melexis Technologies. Le MLX90817 est livré avec une interface hôte configurable qui prend en charge la communication série I2C et le traitement du signal configurable (l'utilisateur est autorisé à traiter le signal de sortie sous forme analogique ou numérique). Il mesure la pression de 0,2 à 3 bar avec une précision de pression de ± 33 mbar. Son architecture basée sur DSP utilisant un microcontrôleur 16 bits offre des performances exceptionnelles en termes de précision initiale et assure un fonctionnement dans une plage de températures de -40 °C à +120 °C, garantissant un fonctionnement stable dans des conditions extrêmes. Cette carte Click™ convient aux mesures de pression automobiles, industrielles et grand public.
La carte Click Board™ Pressure 19 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 Pressure 19 Click Board™ Work?
The Pressure 19 Click Board™ as its foundation uses the MLX90817, a factory-calibrated absolute pressure sensor delivering ratiometric analog output from Melexis Technologies. The MLX90817 absolute pressure sensor includes a sensing element, analog to digital converter, signal processing part, and digital interface that sends the digital pressure data to the host controller. It measures pressure from 0.2 up to 3bar with pressure accuracy of ±33mbar over a wide operating temperature range at the industry's lowest power.
The MLX90817 contains a pressure sensing element that consists of a diaphragm, which reacts to a change in absolute pressure, realized in the silicon chip by wafer bonding on an etched cavity with a built-in reference vacuum. The internal strain increases, in particular at the border of the diaphragm, where piezo-resistive elements have been implanted into the silicon diaphragm forming a Wheatstone bridge, which acts as a transducer. The front end amplifies the signal from the bridge and performs a coarse offset compensation and an ADC conversion. Then, the DSP executes the compensations over temperature. Furthermore, the digital circuit provides some filtering, the possibility to linearize the pressure signal, and also implements the clamping function, delivering an analog output proportional to the pressure.
The analog output voltage of the MLX90817 can be converted to a digital value using MCP3221, a successive approximation A/D converter 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. Selection can be performed by onboard SMD jumper labelled as AD SEL to an appropriate position marked as AN and ADC. 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, this 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 Pressure 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 | Pressure |
| Applications | The Pressure 19 Click Board™ can be used for automotive, industrial, and consumer pressure measurements |
| On-board modules | MLX90817 - absolute pressure sensor from Melexis Technologies |
| Key Features | Low power consumption, high accuracy, piezoresistive sensing principle, built-in temperature compensation function, allow to process the output signal in analog or digital form, system in package, factory calibrated, and more |
| Interface | Analog,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 pinout of the Pressure 19 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 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| JP2 | AD SEL | Right | Output Voltage A/D Selection AN/ADC: Left position AN, Right position ADC |
PRESSURE 19 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Operating Pressure Range | 0.2 | - | 3 | bar |
| Pressure Accuracy | -33 | - | +33 | mbar |
| Resolution | - | 16 | - | bits |
| Operating Temperature Range | -40 | +25 | +120 | °C |
Software Support
We provide a library for the Pressure 19 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 Pressure 19 Click Board™ driver.
Key functions
-
pressure19_get_pressureThis function reads the output voltage and converts it to pressure in mBar. -
pressure19_read_voltageThis function reads raw ADC value and converts it to proportional voltage level. -
pressure19_set_vrefThis function sets the voltage reference for Pressure 19 click driver.
Example Description
This example demonstrates the use of the Pressure 19 Click Board™ by reading and displaying the absolute pressure value in mBar.
void application_task ( void )
{
uint16_t pressure;
if ( PRESSURE19_OK == pressure19_get_pressure ( &pressure19, &pressure ) )
{
log_printf( &logger, " Pressure : %u mBarrnn", pressure );
Delay_ms( 1000 );
}
}
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.Pressure19
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 Pressure 19 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.
Panneau de clic à pression 19
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