CozIR-LP3 Sensor Evaluation Board User Guide
39Pages

CozIR®-LP3 Evaluation Board User Guide Gas Sensing Solutions Ltd. Page | 1 For regular updates, sign up at https://gassensing.co.uk Revision 1.6, 17 December 2020 Copyright © 2021 Gas Sensing Solutions Ltd.

For regular updates, sign up at https://gassensing.co.uk Revision 1.6, 17 December 2020 Copyright © 2021 Gas Sensing Solutions Ltd.

Gas Sensing Solutions Ltd. Page | 3 For regular updates, sign up at https://gassensing.co.uk Revision 1.6, 17 December 2020 Copyright © 2021 Gas Sensing Solution

USER GUIDE INTRODUCTION This evaluation board is designed to provide a fast and easy start for evaluation of the GSS CozIR®LP3 sensor. The evaluation board brings several interfaces and interconnections shown in Figure 1. The CozIR®-LP3 Evaluation Board is designed to allow the user to evaluate all the hardware and software functions of the sensor. This manual provides information about the board’s interconnections, jumper settings, communications, and debug interfaces. The sensor can be controlled by a PC application via the USB interface, or standalone and controlled externally via...

USER GUIDE USB DRIVER To interface to a PC, the evaluation board requires a USB-A to USB-Mini B cable and a USB driver to function correctly. Recent versions of Windows will automatically identify and install the USB driver when you plug in the lead. If the USB driver is not installed, or the evaluation board will not connect to a COMM port, please download the USB driver from the FTDI website: https://www.ftdichip.com/Drivers/VCP.htm Choose “VCP Drivers” and select the correct driver for your operating system. SOFTWARE INSTALLATION The GSS evaluation board software is available direct from...

USER GUIDE EVALUATION BOARD CONCEPT Figure 1: Evaluation Board Key Components The evaluation board consists of a USB interface device, which connects to an on-board micro-controller. The on-board microcontroller connects to the sensor using either its UART or I2C interface. The interface mode is user selectable. The microcontroller also interfaces to the environmental monitoring sensors. The board comes with temperature, humidity, and pressure sensors. Gas Sensing Solutions Ltd. Page | 6 For regular updates, sign up at https://gassensing.co.uk Revision 1.6, 17 December 2020 Copyright © 2021...

USER GUIDE Figure 2: Top Side Evaluation Board Figure 3: Bottom Side Evaluation Board Gas Sensing Solutions Ltd. Page | 7 For regular updates, sign up at https://gassensing.co.uk Revision 1.6, 17 December 2020 Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE STANDALONE OPERATION The sensor can be completely isolated from the rest of the evaluation board electronics. This allows the user to conveniently control the sensor directly via edge connectors J3, J4 and J5. To operate in this manner, the DIP switches (S5) must be set to isolate the sensor from the microcontroller by putting them into the off position. SWITCH POSITION Page | 8 For regular updates, sign up at https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE SENSOR POWER SUPPLY If the sensor is to be evaluated in isolation and separately from the evaluation board USB interface and software, it must be provided with power. There are three methods to provide power to the sensor. Note the sensor must be powered via the USB interface if the GSS evaluation software is to be used. Method 1 - External Power Supply The sensor can be supplied from an external power source via the connector (J2). This connector can accept either a 2.5mm or 2.1mm standard DC 5V power supply barrel plug. This drives a low noise low drop out (LDO) regulator,...

USER GUIDE Method 3 - Variable External Power Supply The user can also drive the sensor directly with an external power supply, bypassing the on-board low noise LDO and FET switch. This allows the user to evaluate the behaviour of the sensor with different supply voltages or power sources. To enable this mode of operation, the following settings need to be configured. The evaluation board has pull-up resistors for the I2C serial data input/output lines in each of these modes. They pull-up to either the on-board 3.3V supply, or the external VDD on J5, pin 2. All the sensor connections are...

Page | 11 For regular updates, sign up at https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE SENSOR POWER CONSUMPTION MEASUREMENT The sensor evaluation board contains circuitry to allow the user to accurately measure sensor current consumption. A high-precision, high-side current-sense amplifier is used to measure the current through a 1.5ohm resistor R6. The signal is digitised by the on-board microcontroller. The application software displays the current draw of the sensor over a measurement cycle. The sensor power consumption measurement application operates when using sensor power method 2. It cannot be used when powering the sensor using method 1 or 3. ENVIRONMENTAL...

USER GUIDE SOFTWARE USER INTERFACE All the main sensor and evaluation board functions are controlled through a single user interface, displayed above. Hovering over a button will display the tips for that function. Gas Sensing Solutions Ltd. Page | 13 For regular updates, sign up at https://gassensing.co.uk Revision 1.6, 17 December 2020 Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDEGas Sensing Solutions RUNNING THE SOFTWARE The software may start automatically after installation. If it does not, you can start it from the "Program" Menu in the Start Menu. Look for the filename GSS Customer Evaluation Board. The opening screen is below. Evaluation and Logging Software Graph Data Temperature, Humkay Manual Poling Data iggfrig Spang wBhoi Ntaogen Auto Zero Initial Interval Average Current Normal Interva! Last Zero Value Pressure Comp Pressure Comp Termnal View To connect to the sensor, select the correct COM port from the drop-down Connection list, and click the...