Datasheet Review and Integration
Thought for 55 sec
Below is a summary of the components that we can add to realize your gas sensor shield design:
Table
| Component | Designator Suggestion | Link |
|---|---|---|
| CO Gas Sensor | S1 | CO Gas Sensor |
| NO₂ Gas Sensor | S2 | NO2 Gas Sensor |
| SO₂ Gas Sensor | S3 | SO2 Gas Sensor |
| O₃ Gas Sensor | S4 | O3 Gas Sensor |
| LMP91000 AFE (×4, one per sensor) | U1, U2, U3, U4 | LMP91000 |
| ADS1219 4-Channel 24-bit ADC | U5 | ADS1219 |
| REF5020 Voltage Reference (2.048V) | U6 | REF5020 |
| 3.3V DC-DC Regulator | U7 | 3.3V DC-DC Regulator |
| 5V Supply Connector (Input) | J1 | 5V Connector |
| Ground (GND) | GND | GND |
Design Overview:
- Gas Sensor to AFE: Each gas sensor ([S1]–[S4]) will be interfaced with a dedicated LMP91000 (U1 through U4).
- AFE Output to ADC: The analog outputs (VOUT) from the 4 LMP91000 parts will connect to the four channels of the ADS1219 (U5).
- Voltage Reference: The REF5020 (U6) will supply a 2.048V reference for the ADC.
- Power Supplies: A 5V Connector (J1) will provide the 5V input. A 3.3V DC-DC Regulator (U7) will step down the 5V to 3.3V to power the sensors, AFEs, ADC, and any other circuitry.
- Grounding: A common GND node will be used for proper reference.
Would you like me to add these components to your schematic now? Once they’re added, we can begin wiring the nets according to your design requirements.
add header for I2C connection, MENB connections to LMP91000 and VREF
Add 2 header pins and connect the I2C SDA and SCL to it
Thought for 24 sec
The schematic now includes a 2‑pin header from Header Connector (designated as J1) with its first pad connected to the SDA net and its second pad connected to the SCL net.
Brainstorm ideas
Project requirements
Key constraints
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