Mikroelektronika d.o.o.
Current 7 Click Board
Current 7 Click Board
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Overview
The Current 7 Click Board™ is a compact add-on board providing a precise and accurate current sensing solution. This board features the INA282, a wide common-mode range, bidirectional, high-accuracy current shunt monitor from Texas Instruments. The INA282 represents a voltage output current shunt monitor that can sense drops across shunts at common-mode voltages from –14 V to +80 V, independent of the supply voltage, which operates in a range from 2.7V up to 18V supply. The zero-drift topology enables high-precision measurements with maximum input offset voltages as low as 70μV. Also, the user is allowed to process the output signal in analog or digital form. This Click board™ delivers higher performance to industrial control and automation applications, load and power supplies monitoring, telecom equipment, and many more.
The Current 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 Current 7 Click Board™Work?
The Current 7 Click Board™ is based on the INA381, a high-accuracy current-sensing amplifier from Texas Instruments. This voltage output current-sensing amplifier accurately measures voltages developed across the current-sensing resistor (also known as a current-shunt resistor) at a common-mode range that extends 14V below the negative supply rail as up to 80V, allowing for either low-side or high-side current sensing. The zero-drift topology enables high-precision measurements with maximum input offset voltages as low as 70μV over the entire temperature range of –40°C to +120°C.
The Current 7 Click Board™ possesses two ways to communicate with the MCU. The analog output signal of the INA282 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 OUT SEL, setting it to an appropriate position marked as AN and ADC.
The INA282 also allows a connection of external voltage signals on the onboard headers labelled as REF1 and REF2 for the device's reference voltage. This reference voltage determines how the output responds to certain input conditions. The configurable settings of the reference voltage control resistors, R5 and R6, allow the INA282 to be used in unidirectional and bi-directional applications. More information about these operational modes can be found in the attached datasheet.
The Current 7 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows for both 3.3V and 5V capable MCUs to use the communication lines properly. Additionally, there is a possibility for the INA282 power supply selection via jumper labelled as PWR SEL to supply the INA282 from an external power supply terminal in the range from 2.7V to 18V or with mikroBUS™ power rails. 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 | Measurements |
| Applications | The Current 7 Click Board™ can be used for industrial control and automation applications, load and power supplies monitoring, telecom equipment, and many more |
| On-board modules | INA381 - current-sensing amplifier from Texas Instruments |
| Key Features | Wide input common-mode range, low power consumption, bidirectional and unidirectional current sensing, high accuracy and precision, 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,External |
PINOUT DIAGRAM
This table shows how the pinout of the Current 7 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Analog Device | 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 | PWR SEL | Right | INA282 Power Supply Selection EXT/INT: Left position EXT, Right position INT |
| JP3 | OUT SEL | Right | Output Voltage A/D Selection AN/ADC: Left position AN, Right position ADC |
| R5-R6 | R5-R6 | Populated | Reference Voltage Control Resistors |
| J1-J2 | REF1-REF2 | Unpopulated | External Reference Voltage Headers |
CURRENT 7 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage VCC | 3.3 | - | 5 | V |
| External Supply Voltage VEXT | 2.7 | - | 18 | V |
| Common-Mode Voltage Range | -14 | - | +80 | V |
| Gain | - | 50 | - | V/V |
| Operating Temperature Range | -40 | +25 | +120 | °C |
Software Support
We provide a library for the Current 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 MikroE Github account.
Library Description
This library contains API for the Current 7 Click Board™ driver.
Key functions
-
current7_get_adcCurrent 7 get ADC function. -
current7_get_adc_voltageCurrent 7 get ADC voltage function. -
current7_get_currentCurrent 7 get current function.
Example Description
This library contains API for the Current 7 Click Board™ driver. The demo application reads ADC value and current ( A ).
void application_task ( void )
{
static float current;
static uint16_t adc_val;
current7_get_adc( ¤t7, &adc_val );
log_printf( &logger, " ADC : %d rn", adc_val );
log_printf( &logger, "- - - - - - - - - - rn" );
current7_get_current( ¤t7, ¤t );
log_printf( &logger, " Current : %.3f Arn", current );
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.Current7
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 Current 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.
Software Support
We provide a library for the Current 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 MikroE Github account.
Library Description
This library contains API for the Current 7 Click Board™ driver.
Key functions
-
current7_get_adcCurrent 7 get ADC function. -
current7_get_adc_voltageCurrent 7 get ADC voltage function. -
current7_get_currentCurrent 7 get current function.
Example Description
This library contains API for the Current 7 Click Board™ driver. The demo application reads ADC value and current ( A ).
void application_task ( void )
{
static float current;
static uint16_t adc_val;
current7_get_adc( ¤t7, &adc_val );
log_printf( &logger, " ADC : %d rn", adc_val );
log_printf( &logger, "- - - - - - - - - - rn" );
current7_get_current( ¤t7, ¤t );
log_printf( &logger, " Current : %.3f Arn", current );
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.Current7
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 Current 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.
Frequently Asked Questions
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