Heater Driver Circuits and Control ................................................................................................................................................................7
6.1 Constant Voltage Drive........................................................................................................................................................................7
6.2 Constant Current Drive ........................................................................................................................................................................8
6.4 Operating the Sensor at Temperature Extremes .................................................................................................................................9
7.2 Response and Recovery Time ..........................................................................................................................................................11
Maximum ESD Ratings ..............................................................................................................................................................................13
10. Package Drawing and Dimensions .............................................................................................................................................................14
11. Applications and Use Conditions ................................................................................................................................................................15
Figure 2. Pin Assignments for SGAS711 – Top View .........................................................................................................................................4
Figure 5. Three Terminal Voltage Regulator ......................................................................................................................................................7
Figure 6. Voltage-Controlled Constant Current Circuit .......................................................................................................................................8
Figure 7. Recommended Applied Heater Voltage as a Function of Environmental Temperature ......................................................................9
Figure 8. Sensor Response to a Variety of Flammable Gases .........................................................................................................................10
Figure 9. Effect of Different Humidity Levels on Sensor Signal at Ambient Temperature ................................................................................11
Figure 10. Typical Sensor Response to Step Changes in Methane Concentration for Seven SGAS711 Sensors ............................................11
Figure 11. Typical Sensor Response to other Common Gases..........................................................................................................................12
Temperature Specifications .................................................................................................................................................................5
Maximum ESD Ratings .....................................................................................................................................................................13
Mechanical Stress Test Conditions ...................................................................................................................................................13