Digital Interface for SGAS7xx Sensors AN-992 Application Note
●Introduction
■The IDT SGAS7xxline of solid-state chemiresistive gas sensors provide a cost-effective means of detecting several types of gases in atmospheres. The schematic for the sensors in the SGAS family is shown in Figure 1.The sensors consist of a high-resistance metal-oxide semiconductor element (R-S) and low-resistance heating element(R-H), each driven by control circuits as described in the SGAS7xx datasheets. While it is possible to design analog circuitry to regulate the heater drive and directly output the sensor signal as a voltage or current proportional to the sensor resistance, device designers often require a digitally controlled interface for operating the SGAS7xx sensor. This application note provides general guidance for developing an SGAS7xx digital interface, focusing on a low-cost implementation using a minimum number of components.
●Overview
■A block diagram of a functional digital system for the SGAS7xx sensor is shown in Figure 2. The analog front-end (AFE) contains circuitry that conditions signals between the SGAS7xx sensor and the microcontroller unit (MCU), and the “Power Conditioning”block represents circuitry that produces regulated power for the AFE and MCU. All control and measurement functionality resides in the MCU, which can be selected from the many low-cost 8-bit or 16-bit devices currently produced by microcontroller manufacturers.The remainder of this application note describes how the combined functionality of the blocks in Figure 2 provides measurement and control functionality for SGAS7xx sensors.
|
|
|
|
Application note & Design Guide |
|
|
|
|
Please see the document for details |
|
|
|
|
|
|
|
|
|
|
|
English Chinese Chinese and English Japanese |
|
|
November 29, 2017 |
|
|
|
|
|
AN-992 |
|
|
409 KB |
- +1 Like
- Add to Favorites
Recommend
All reproduced articles on this site are for the purpose of conveying more information and clearly indicate the source. If media or individuals who do not want to be reproduced can contact us, which will be deleted.
Integrated Circuits
Discrete Components
Connectors & Structural Components
Assembly UnitModules & Accessories
Power Supplies & Power Modules
Electronic Materials
Instrumentation & Test Kit
Electrical Tools & Materials
Mechatronics
Processing & Customization
