NO2 2 Click Board™

The NO2 2 Click Board™ contains the required resistances used to form a voltage divider with the sensor, as well as the accurate SAR type ADC with 12-bit resolution which allows the voltage to be converted, using 5V from the mikroBUS rail as a voltage reference. Featuring the MiCS-2714, a robust and reliable gas sensor which requires a minimal number of additional components, the MCP3201, an accurate 12-bit ADC by Microchip, proven in many Click Board™ designs so far, the NO2 2 Click Board™ represents an ideal solution for a rapid development in all kinds of harsh environments of applications such as gas leakage applications, fire detection applications, CO detectors, and similar reducing gasses detecting applications.

How Does The NO2 2 Click Board™ Work?

The NO2 2 Click Board™ is equipped with the MiCS-2714 sensor, a compact MOS sensor from SGX Sensortech. This sensor consists of a micromachined metal oxide semiconductor diaphragm, with an integrated heating resistor. The resistor produces heat which catalyzes the reaction, which in turn affects the electrical resistance of the oxide layer itself. The temperature of the heater is quite high: it is in the range from 350 °C to 550 °C. After the initial preheating period, the sensor can detect gas changes in time intervals below two seconds.

The resistance of the MiCS-2714 sensor does not change linearly with the gas concentration, so a proper calibration must be performed prior to using it for absolute gas concentration measurement applications. The impedance changes the most when used with low gas concentrations. As the atmosphere gets saturated with gas, the impedance changes slower.

The MiCS-2714 sensor is a simple device: it has only four connections. Two pins are the connections of the internal heating element, while the other two pins are the MOS sensor connections. The application is reduced to calculating a proper resistor for the voltage divider. The middle tap between the sensor (as a resistor) and the fixed resistance is used to provide an output voltage. It directly depends on the resistance of the sensor, allowing it to be used as the input into the MCP3201, a low-power 12-bit A/D converter with I2C interface, from Microchip. This ADC allows the output voltage to be translated into a digital information, which can be accessed over the I2C pins on the mikroBUS socket. By using the power supply voltage as the voltage reference for the conversion, this ADC further reduces the complexity of the design, still offering a good conversion quality, thanks to its low noise input. Due to the sensor's inert nature, this ADC is more than fast enough, although it can provide up to 22.3 ksps when operated in the I2C Fast mode.

The NO2 2 Click Board™ is designed to be operated only with 5V logic level. A proper logic voltage level conversion should be performed before the Click Board™ is used with MCUs with logic levels of 3.3V.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the NO2 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	PHT	Preheating
	NC	2	RST	INT	15	NC
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
	NC	6	MOSI	SDA	11	NC
	NC	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

NO2 2 Click Board™ ELECTRICAL SPECIFICATIONS