Mikroelektronika d.o.o.
Hall Current 12 Click-Board
Hall Current 12 Click-Board
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Der Hall Current 12 Click Board™ ist eine kompakte Zusatzplatine, die kostengünstige und präzise Lösungen zur AC- oder DC-Strommessung bietet. Diese Platine verfügt über den TMCS1100, einen galvanisch isolierten Hall-Effekt-Stromsensor von Texas Instruments, der DC- oder AC-Strom mit hoher Genauigkeit, ausgezeichneter Linearität und Temperaturstabilität messen kann. Er ermöglicht die geringste Drift, <1 % Vollausschlagsfehler und höchste Genauigkeit über Zeit und Temperatur. Er bietet außerdem eine zuverlässige 600-V-Lebensdauerbetriebsspannung und 3 kVRMS-Isolierung zwischen Strompfad und Schaltkreis mit uni-/bidirektionaler Strommessung. Außerdem kann der Benutzer das Ausgangssignal in analoger oder digitaler Form verarbeiten.
Das Hall Current 12 Click Board™ eignet sich für die AC- oder DC-Strommessung in industriellen und gewerblichen Systemen, zur Motor- und Laststeuerung, zur Leistungsfaktorkorrektur, zum Überstromschutz und vielem mehr.
How Does The Hall Current 12 Click Board™ Work?
The Hall Current 12 Click Board™ as its foundation uses the TMCS1100, a precision Hall-effect current sensor, featuring a 600V isolation working voltage, <1% full-scale error across temperature, and a reference voltage enabling unidirectional or bidirectional current sensing from Texas Instruments. The input current flows through an internal 1.8mΩ conductor that generates a magnetic field measured by an integrated Hall-effect sensor and amplified by a precision signal chain. The device has a bandwidth of 80kHz and can be used for both AC and DC current measurements. It is optimized for high accuracy and temperature stability, with offset and sensitivity compensated across the operating temperature range.
The reference voltage provided to the TMCS1100 on the VREF pin determines the zero current output voltage. This zero-current output level, along with sensitivity, determines the measurable input current range allowing for unidirectional or bidirectional sensing. An onboard SMD switch labelled as VREF SEL, placed to an appropriate position marked as VCC/2 and GND, can select reference voltage. With VCC/2, the TMCS1100 measures input current up to ±23 A, while with the GND position from 0.5A up to 48A.
The Hall Current 12 Click Board™ has two ways to communicate with the MCU. The output analogue signal from TMCS1100 is forwarded to the input of the operational amplifier, the LMV321 low-voltage rail-to-rail OpAmp from Texas Instruments, which represents the most cost-effective solution for applications where low voltage operation is needed. The output of the LMV321 OPAmp has a stable unity-gain, acting as a buffer so that the host MCU can sample the output voltage of the TMCS1100 via the AN pin of the mikroBUS™ socket. Also, with this method, it is possible to increase the sensitivity of its output signal by placing the switch labelled as SENSITIVITY to the appropriate position marked as LOW or HIGH, giving the user the option to select reduced or increased sensitivity.
Another way of signal processing is for the TMCS1100 analogue output signal to 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. Selection can be performed by onboard SMD switch labelled as VOUT SEL, placing it to an appropriate position marked as AN and ADC. With the MCP3221, data transfers at rates of up to 100kbit/s in the Standard and up to 400kbit/s in the Fast Mode.
Also, this Click board™ should be connected in series with the load. The current is measured by two onboard terminal connectors, one terminal block for the positive and the other for the negative current input.
The Hall Current 12 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 | Current sensor |
| Applications | Can be used for AC or DC current-sensing in industrial and commercial systems, motor and load control, power factor correction, overcurrent protection, and many more |
| On-board modules | TMCS1100 - galvanically isolated Hall-effect current sensor capable of DC or AC current measurement from Texas Instruments |
| Key Features | High accuracy and precision, excellent linearity, and temperature stability, 3kVRMS isolation rating, robust 600V lifetime working voltage, bidirectional and unidirectional current sensing, and more |
| Interface | Analog, I2C |
| Compatibility | mikroBUS |
| Click board size | L (57.15 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
Pinout Diagram
This table shows how the pinout on Hall Current 12 Click 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 |
| SW1 | SENSITIVITY | Left | OPAmp Sensitivity Selection LOW/HIGH: Left position LOW, Right position HIGH |
| SW2 | VOUT SEL | Left | Output Voltage A/D Selection AN/ADC: Left position AN, Right position ADC |
| SW3 | VREF SEL | Left | Reference Voltage Selection VCC/2/GND: Left position VCC/2, Right position GND |
Hall Current 12 Click Board™ Electrical Specifications
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage VCC | 3.3 | - | 5 | V |
| Maximum Measurement Range @ VREF = VCC/2 | - | - | ±23 | A |
| Maximum Measurement Range @ VREF = GND | 0.5 | - | 48 | A |
| Sensitivity | - | 100 | - | mV/A |
| Operating Temperature Range | -40 | +25 | +125 | °C |
Software Support
We provide a library for the Hall Current 12 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 Hall Current 12 Click Board™.
Key Functions
hallcurrent12_get_adc- Hall Current 12 get ADC function.hallcurrent12_get_adc_voltage- Hall Current 12 get ADC voltage function.hallcurrent12_get_current- Hall Current 12 get the current function.
Example Description
This library contains API for the Hall Current 12 Click Board™ driver. The demo application reads ADC value and current ( A ).
void application_task ( void )
{
static uint16_t adc_data;
static float current;
hallcurrent12_get_adc( &hallcurrent12, &adc_data );
log_printf( &logger, " ADC Value : %d rn", adc_data );
Delay_ms( 100 );
hallcurrent12_get_current ( &hallcurrent12, ¤t );
log_printf( &logger, " Current : %.3f A rn", current );
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.HallCurrent12
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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
mikroSDK
The Hall Current 12 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.
Hall Current 12 Click-Board
Frequently Asked Questions
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