Mikroelektronika d.o.o.
Carte à clic ADC 18
Carte à clic ADC 18
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Key Features:
- Entrée analogique industrielle configurable calibrée en usine, haute précision, configurabilité logicielle, ADC sigma-delta 24 bits, faible consommation d'énergie, interface série haute vitesse, hautes performances, etc.
- Basé sur le MAX22005 - convertisseur analogique-numérique à douze canaux d'Analog Devices
- Peut être utilisé pour les applications les plus exigeantes, de l'acquisition de données à distance à usage général aux applications industrielles
- mikroBUS : interface SPI
L' ADC 18 Click Board™ est une carte complémentaire compacte qui contient un convertisseur de données hautes performances. Cette carte est équipée du MAX22005, un convertisseur analogique-numérique (ADC) 24 bits à douze canaux configurable par SPI d'Analog Devices. Les canaux d'entrée peuvent être utilisés comme douze entrées asymétriques, six entrées différentielles et jusqu'à huit entrées différentielles configurables multicanaux. Au total, l'appareil prend en charge jusqu'à 26 configurations différentes. L'ADC est utilisé avec une référence de précision intégrée de 5 ppm/°C. À l'aide d'amplificateurs d'entrée haute tension à dérive nulle, les plages de tension d'entrée analogiques industrielles standard sont converties en plage de tension d'entrée ADC. Cette carte Click™ offre une grande précision pour les applications les plus exigeantes, de l'acquisition de données à distance à usage général aux applications industrielles.
La carte Click Board™ ADC 18 est supportée 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 ADC 18 Click Board™ Work?
The ADC 18 Click Board™ as its foundation uses the MAX22005, a high-performance twelve-channel analog-to-digital converter from Analog Devices. The MAX22005 comes with an integrated 24-bit delta-sigma ADC, input multiplexer, signal conditioning, and control logic block allowing ADC to communicate with MCU through a high-speed serial interface. An integrated delta-sigma ADC is shared between all channels with an integrated 5ppm/°C precision reference. Using high-voltage, zero-drift input amplifiers, standard industrial analog input voltage ranges are converted to the ADC input voltage range.
Input channels can be used as twelve single-ended, six differential, and up to eight multichannel configurable differential inputs. In total, the device supports up to 26 different configurations. The MAX22005 can also be configured as an analog-input current-mode device using an external precision resistor per channel or configurable analog-input using an external precision resistor and low-cost switch per channel. All input ports are robustly protected up to ±36V reverse polarity and ±2kV surge pulses without the need for TVS diodes and factory calibrated with a best-in-class system performance of less than 0.05% FSR Total-Unadjusted-Error (TUE) over temperature.
The ADC 18 Click Board™ communicates with MCU through a standard SPI interface and operates at clock rates up to 30MHz, for all configurations and information management and acquiring conversion results. In addition, it also uses several mikroBUS™ pins. An active-low reset signal routed on the RST pin of the mikroBUS™ socket activates a hardware reset of the system, while the INT pin on the mikroBUS™ socket represents a standard interrupt feature providing a user with feedback information. It also has an additional data ready interrupt marked as RDY and routed on the AN pin of the mikroBUS™ socket, used to signal when a new ADC conversion result is available in the data register.
The ADC 18 Click Board™ can be operated only with a 3.3V logic voltage level. It also has an analog inputs external power supply terminal where it is necessary to bring ±15V to accept ± 10V inputs, whose full-scale range is ± 12.5V. 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 | ADC |
| Applications | The ADC 18 Click Board™ can be used for the most demanding applications, from general-purpose remote data acquisition to industrial applications |
| On-board modules | MAX22005 - twelve-channel analog-to-digital converter from Analog Devices |
| Key Features | Factory-calibrated configurable industrial-analog input, high accuracy, software configurability, 24-bit sigma-delta ADC, low power consumption, high-speed serial interface, high performance, and more |
| Interface | SPI |
| Compatibility | mikroBUS |
| Click board size | L (57.15 x 25.4 mm) |
| Input Voltage | 3.3V,External |
PINOUT DIAGRAM
This table shows how the pinout of the ADC 18 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Data Ready | RDY | 1 | AN | PWM | 16 | NC | |
| Reset | RST | 2 | RST | INT | 15 | INT | Interrupt |
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | NC | |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | NC | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| J1-J2 | - | Populated | Analog Input Channel Headers |
ADC 18 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.3 | - | V |
| Input-Voltage Range | - | ±15 | - | V |
| Resolution | - | 24 | - | bits |
| Operating Temperature Range | -40 | +25 | +120 | °C |
Software Support
We provide a library for the ADC 18 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 ADC 18 Click Board™ driver.
Key functions
-
adc18_set_active_channelThis function sets the active channel. -
adc18_start_conversionThis function starts the conversion with the selected data rate. -
adc18_read_voltageThis function reads RAW ADC value of previous conversion and converts it to voltage.
Example Description
This example demonstrates the use of the ADC 18 Click Board™ by reading the voltage from 12 analog input single-ended channels.
void application_task ( void )
{
static uint8_t channel = ADC18_CH_AI1_SINGLE_ENDED;
if ( ADC18_OK == adc18_set_active_channel ( &adc18, channel ) )
{
adc18_start_conversion ( &adc18, ADC18_DATA_RATE_225_SPS );
// Waits for the availability of the conversion result
while ( adc18_get_rdy_pin ( &adc18 ) );
adc18_stop_conversion ( &adc18 );
float voltage;
if ( ADC18_OK == adc18_read_voltage ( &adc18, &voltage ) )
{
log_printf ( &logger, "Channel AI%u: %.2f Vrn", channel + 1, voltage );
if ( ++channel > ADC18_CH_AI12_SINGLE_ENDED )
{
channel = ADC18_CH_AI1_SINGLE_ENDED;
log_printf ( &logger, "rn" );
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.ADC18
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 ADC 18 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 ADC 18
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