Mikroelektronika d.o.o.
Oberflächentemperatur 2 Click Board
Oberflächentemperatur 2 Click Board
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Das Surface Temp 2 Click Board™ ist eine kompakte Zusatzplatine, die einen hochgenauen Temperatursensor enthält, der bahnbrechende Leistung über einen weiten industriellen Temperaturbereich bietet. Diese Platine verfügt über den ADT7422, einen 16-Bit-I2C-Temperatursensor von Analog Devices. Der ADT7422 verfügt über einen Präzisions-ADC, der 16-Bit-Temperaturmessungen im Bereich von 25 °C bis 50 °C mit einer Auflösung von 0,0078 °C und einer Genauigkeit von ± 0,1 °C bietet. Außerdem ist keine zusätzliche Kalibrierung erforderlich. Dies macht das Surface Temp Click zu einer ausgezeichneten Wahl für RTD- und Thermistorersatz, Vital Signs Monitoring (VSM), Lebensmitteltransport und -lagerung, Umweltüberwachung, HVAC und andere Anwendungen.
Das Surface Temp 2 Click Board™ wird von einer mikroSDK-kompatiblen Bibliothek unterstützt, die Funktionen enthält, die die Softwareentwicklung vereinfachen. Dieses Click Board™ wird als vollständig getestetes Produkt geliefert und ist bereit für den Einsatz auf einem System, das mit der mikroBUS™-Buchse ausgestattet ist.
How Does The Surface Temp 2 Click Board™ Work?
The Surface Temp 2 Click Board™ is based on the ADT7422, a high accuracy 16-bit digital temperature sensor with programmable interrupt and critical temperature indicator from Analog Devices. The ADT7422 has high accuracy and linearity over the entire rated temperature range without needing correction or calibration by the user. Operating at 3.3 V, the average supply current is typically 210 μA. The ADT7420 has a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 μA at 3.3 V. The ADT7422 Digital Temperature Sensor is designed to meet the ASTM E1112 standard of clinical thermometry specification. This sensor is used in applications such as Vital Signs Monitoring (VSM), medical equipment, thermocouple cold junction compensation, and laser diode temperature control.
The Surface Temp 2 Click Board™ has a sensing pad, which is thermally connected to an ADT7422, for temperature sensing. It uses a 16-bit ADC to monitor and digitize the temperature to 0.0078°C of resolution. The ADC resolution, by default, is set to 13 bits (0.0625°C). An internal temperature sensor generates a voltage proportional to absolute temperature, which is compared to an internal voltage reference and input into a precision digital modulator. The sensor output is digitized by a Σ-Δ modulator, also known as the charge balance type ADC. This type of converter utilizes time-domain oversampling and a high accuracy comparator to deliver 16 bits of resolution.
The Surface Temp 2 Click Board™ communicates with MCU using the standard I2C 2-Wire interface with a maximum frequency of 400kHz. The ADT7422 has a 7-bit slave address with the first five MSBs fixed to 10010. The address pins A0 and A1 are programmed by the user and determines the value of the last two LSBs of the slave address which can be selected by onboard SMD jumpers labelled as ADDR SEL allowing selection of the slave address LSBs.
It also generates a programmable interrupt signal (over/under temperature indicator) routed on the INT pin and critical overtemperature indicator CT routed on the PWM pin of the mikroBUS™ socket. Those pins have two over/under temperature modes: Comparator and Interrupt mode. The Interrupt mode is the default overtemperature mode which sets INT pin high when the temperature is greater than the internally defined limit value, while in Comparator mode the INT pin returns to an inactive state when the temperature drops below that limit value. The CT pin is activated if a critical overtemperature event occurs.
The Surface Temp 2 Click Board™ is designed to be operated with both 3.3V and 5V logic voltage levels that can be selected via VCC SEL jumper. This allows for both 3.3V and 5V capable MCUs to use the I2C communication lines properly.
SPECIFICATIONS
| Type | Temperature |
| Applications | Can be used for RTD and thermistor replacement, medical equipment, food transportation and storage, environmental monitoring, HVAC, and other applications. |
| On-board modules | The Surface Temp 2 Click Board™ is based on the ADT7422, a high accuracy 16-bit digital temperature sensor with programmable interrupt and critical temperature indicator from Analog Devices. |
| Key Features | Low power consumption, no calibration needed, long-term stability and reliability, high accuracy for industrial, instrumentation, and medical applications, and more. |
| Interface | 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 of the Surface Temp 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | CT | Critical Overtemp Indicator | |
| NC | 2 | RST | INT | 15 | INT | Overtemp and Undertemp Indicator | |
| 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 | Power Supply Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| JP2-JP3 | ADDR SEL | Left | Communication interface selection: Left position 0, Right position 1 |
SURFACE TEMP 2 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | -0.3 | - | 7 | V |
| Power consumption in Normal Mode | 700 | µW | ||
| Resolution | - | 16 | - | bit |
| Temperature accuracy from −40°C to +125°C | -40 | - | +125 | °C |
| Temperature accuracy from −40°C to +125°C | - | ±0.50 | - | °C |
Software Support
We provide a library for the Surface Temp 2 Click Board™ on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
The library covers all the necessary functions that enables the usage of the Surface Temp 2 Click Board™. User can read temperature, set over temperature, under temperature, critical temperature threshold limits and hysteresis, apply different settings and perform software reset.
Key Functions
float surfacetemp2_get_temperature ( );- Function is used to read and calculate temperatre value.uint8_t surfacetemp2_setup ( uint8_t setup );- Function is used to apply the desired settings.void surfacetemp2_set_hys_val ( uint8_t hys_val );- Function is used to set hysteresis.
Example Description
The application is composed of three sections :
- System Initialization - Initializes I2C and LOG, and sets INT and PWM pins as input.
- Application Initialization - Initalizes I2C driver and sets up the device.
- Application Task - This example shows capabilities of Surface temp 2 Click board by reading temperature and displaying the results via USART terminal.
void application_task ( )
{
temperature = surfacetemp2_get_temperature( );
FloatToStr( temperature, log_txt );
mikrobus_logWrite( " Temperature : ", _LOG_TEXT );
mikrobus_logWrite( log_txt, _LOG_TEXT );
mikrobus_logWrite( " °C", _LOG_LINE );
Delay_ms( 2000 );
}
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
- I2C
- UART
- Conversions
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ 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 Surface Temp 2 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.
Oberflächentemperatur 2 Click Board
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