TIDUF53 December   2023 DRV8210 , INA350 , MSPM0C1105 , MSPM0C1106 , MSPM0H3216 , MSPM0L1306

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 System Design Theory
      2. 2.2.2 Bridge Biasing
      3. 2.2.3 INA Stage
      4. 2.2.4 Filter Design
    3. 2.3 Highlighted Products
      1. 2.3.1 MCU-MSPM0L1306
      2. 2.3.2 OPA-LMV324A
      3. 2.3.3 LDO-TPS7A2433
      4. 2.3.4 INA350
      5. 2.3.5 DRV8210
      6. 2.3.6 ATL431LI
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 System Connection
    2. 3.2 Software Requirements
    3. 3.3 Running the Demonstration
    4. 3.4 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematic
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

2.3.4 INA350

This device is a low-cost instrumentation amplifier optimized for size and low power. The INA350 can be selected as the pressure sensor INA through jumper configurations. This conditions the pressure sensor output for outstanding use of the dynamic range of the ADC. This device has a 3.2-µVPP 1/f noise, a ±0.2-mV input offset, and ±0.6-µV/°C voltage offset over temperature. The device has many desirable features for battery-operated BPMs such as automatic shutdown when idle, package options down to 1.5 mm × 2.00 mm, and integration of passives for a smaller design versus discrete implementations. Figure 2-11 shows the functional block diagram.

The INA350 comes in two different gain variant versions. The INA350ABS can be used in gains of 10 or 20 V/V while the INA350CDS used in this design can be used in gains of 30 or 50 V/V.

Although not used in this design, the new INA351 and INA351A can also be used for this design. The INA351 adds an integrated voltage reference buffer, and the INA351A allows the voltage reference pin to be taken to an external pin so the device can be used for offset correction or to bias additional circuits.

GUID-20231204-SS0I-PJHH-CRMJ-S3RHZN0KNB5D-low.svg Figure 2-11 INA350 Functional Block Diagram