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USB_DAQ (PGA309EVM) for Real Sensor Application. Iven Xu May. 20 th , 2013 iven-xu@ti.com. Agenda. 1. Digital Sensor Emulator (PGA309 onboard sensor emulator)

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usb daq pga309evm for real sensor application

USB_DAQ (PGA309EVM) for Real Sensor Application

Iven Xu

May. 20th, 2013

iven-xu@ti.com

agenda
Agenda
  • 1. Digital Sensor Emulator (PGA309 onboard sensor emulator)
    • The outputs of onboard sensor emulator are controlled by sensor emulator file – like “nonlin2.csv” file (based on the characteristic of real sensor)
  • 2. Sensor Emulator Board (External sensor emulator board)
    • The outputs of external sensor emulator board are controlled by a special spreadsheet – like “Generate_Sim_Values.xls”/SBOC065A (also based on the characteristic of real sensor)
  • 3. Real sensor application
    • Need oven and …
  • Reference:
    • Sensor-Emulator-EVM system Reference Guide (SBOA102A)
    • PGA309 Quick Start (SBOA103C)
    • PGA309-Programmable Sensor Signal Conditioner
    • PGA309EVM-USB User’s Guide (SBOA084A)
    • SBOC065A (http://www.ti.com/litv/zip/sboc065a)
slide3

Digital Sensor Emulator

    • 1.1) 4-wire Vout mode
    • 1.2) 3-wire Vout mode
    • 1.3) Iout mode (must be used with 4-wire)
1 1 4 wire vout mode use pga309evm
1.1) 4-wire Vout mode (Use PGA309EVM):
  • PGA309 EVM Configuration

This is for 4-wire voltage output mode hardware configuration;

We need to create a “.csv” file – like nonlin2.csv.

That file is based on the characteristic of real sensor -such as offset, mid/full scale, drift; and temperature sensor – Temp Sensor Vout vs. temp.

Sensor output

Vex (provide for bridge sensor)

Temp Sensor output

1 1 4 wire vout mode use pga309evm1
1.1) 4-wire Vout mode (Use PGA309EVM):
  • USB_DAQ Board Default Configuration
1 1 4 wire vout mode software configuration
1.1) 4-wire Vout mode:software configuration

Windows 7 Attention

Default GUI Interface

1 1 4 wire vout mode how to create the new nonlin2 csv file
1.1) 4-wire Vout mode: How to create the new nonlin2.csv file
  • Use PGA309 software to create the onboard sensor emulator file (.csv).
  • For more detailed info, pls read the PGA309EVM-USB User’s Guide.pdf (SBOU084A) P47-P51.
1 1 4 wire vout mode how to create the new nonlin2 csv file1
1.1) 4-wire Vout mode: How to create the new nonlin2.csv file
  • Use PGA309 software to create the onboard sensor emulator file (.csv).
  • For more detailed info, pls read the PGA309EVM-USB User’s Guide.pdf (SBOU084A) P47-P51.
slide11

1.1) 4-wire Vout mode: How to create the new nonlin2.csv file

  • Use PGA309 software to create the onboard sensor emulator file (.csv).
  • For more detailed info, pls read the PGA309EVM-USB User’s Guide.pdf (SBOU084A) P47-P51.
slide12

1.1) 4-wire Vout mode: How to create the new nonlin2.csv file

  • Use PGA309 software to create the onboard sensor emulator file (.csv).
  • For more detailed info, pls read the PGA309EVM-USB User’s Guide.pdf (SBOU084A) P47-P51.
slide13

1.1) 4-wire Vout mode: How to create the new nonlin2.csv file

  • Use PGA309 software to create the onboard sensor emulator file (.csv).
  • For more detailed info, pls read the PGA309EVM-USB User’s Guide.pdf (SBOU084A) P47-P51.
1 2 3 wire voltage output mode
1.2) 3-wire voltage output mode:
  • Only different is “JMP7,JMP8” in hardware configuration.
1 3 iout mode

Make sure the “GND” of 24V power supply is float. Do not connect with GND of +-15V power supply.

1.3) Iout mode:
  • USB DAQ Configuration
1 3 iout mode use pga309evm
1.3) Iout mode (Use PGA309EVM):
  • PGA309 EVM Configuration

* When we want to use current output mode of

XTR117:

* we should make sure the configuration of

PGA309 is in 4-wire voltage output mode;

* Because in 3-wire voltage output mode of PGA309, we should turn on/off the Vs of PGA309. But in 3-wire mode, the one-wire and

Vout is connect in one junction, so we cannot

use one-wire to control the Vs (turn on/off).

* conclusion:

we should use 4-wire voltage output

for current output.

Sensor output

24

Vex (provide for bridge sensor)

Temp Sensor output

1 3 iout mode1
1.3) Iout mode:

Use the csv file we created in the last step,

So we can select that file for here.

slide28

2) External Sensor Emulator Board

    • 2.1) 4-wire Vout mode
    • 2.2) 3-wire Vout mode
    • 2.3) Iout mode (must be used with 4-wire)
2 1 4 wire vout mode
2.1) 4-wire Vout mode:
  • Hardware and pre-cal file are the same as 4-wire Vout mode in last step;
  • In this situation, we never use csv file. So do not select sensor emulator file, but we adjust the outputs of external sensor emulator board.
  • The outputs of sensor emulator board is based on the special spreadsheet:
    • http://www.ti.com/litv/zip/sboc065a
    • In this spreadsheet, we need to set the offset/span/drift/sensor range…. It will generate the different output.
    • Also you can reference Sensor Emulator Board User’s Guide (SBOA102A)

We need to adjust the output of sensor emulator board following the below flow:

2 1 4 wire vout mode calibration1
2.1) 4-wire Vout mode: calibration
  • Adjust the pressure and temperature following the prompt window.
2 1 4 wire vout mode calibration continue
2.1) 4-wire Vout mode: calibration (continue)
  • Adjust the pressure and temperature following the prompt window.
2 2 3 wire vout mode
2.2) 3-wire Vout mode:
  • Hardware and pre-cal file are the same as 3-wire Vout mode in last step;
  • In this situation, we never use csv file. So do not select sensor emulator file, but we adjust the outputs of external sensor emulator board.
  • The outputs of sensor emulator board is based on the special spreadsheet:
    • http://www.ti.com/litv/zip/sboc065a
    • In this spreadsheet, we need to set the offset/span/drift/sensor range…. It will generate the different output.
    • Also you can reference Sensor Emulator Board User’s Guide (SBOA102A)
  • We need to adjust the output of sensor emulator board following the below flow: it is the same as 4-wire Vout mod.
2 3 iout mode
2.3) Iout mode:
  • Hardware and pre-cal file are the same as Iout mode in last step;
  • In this situation, we never use csv file. So do not select sensor emulator file, but we adjust the outputs of external sensor emulator board.
  • The outputs of sensor emulator board is based on the special spreadsheet:
    • http://www.ti.com/litv/zip/sboc065a
    • In this spreadsheet, we need to set the offset/span/drift/sensor range…. It will generate the different output.
    • Also you can reference Sensor Emulator Board User’s Guide (SBOA102A)

We need to adjust the output of sensor emulator board following the below flow: it is the same as 4-wire Vout mod.

slide35

3) Real Sensor Application

    • 3.1) 4-wire Vout mode
    • 3.2) 3-wire Vout mode
    • 3.3) Iout mode (must be used with 4-wire)
3 1 take 4 wire for example
3.1) Take 4-wire for example
  • Hardware and pre-cal file is the same as in Digital sensor emulator and External sensor emulator board.
  • Never use the sensor emulator file.
  • Put the real sensor in the oven, adjust the temperature and pressure following with the prompt window, like the below operation:
  • It will need much more time to finish the calibartion.
3 1 take 4 wire for example2
3.1) Take 4-wire for example
  • Adjust the pressure and temperature following the prompt window.
3 1 take 4 wire for example3
3.1) Take 4-wire for example
  • Adjust the pressure and temperature following the prompt window.