Texas Instruments PGA309EVM-USB Theory of Operation for USB-DAQ-Platform, ToPCandPowerSupplies

Page 16

PGA309EVM-USB Hardware Setup

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2.5Theory of Operation for USB-DAQ-Platform

Figure 9 shows the block diagram for the USB-DAQ-Platform. This platform is a general-purpose data acquisition system that is used on several different Texas Instruments evaluation modules. The details of its operation are included in a separate document (available for download at www.ti.com). The block diagram shown in Figure 9 gives a brief overview of the platform. The primary control device on the USB-DAQ-Platform is the TUSB3210.

ToPC￿￿and￿Power￿Supplies

External

Power

(6VDC)

USB￿Bus From￿Computer

External￿Power

VLOOP =￿40VDC

Loop￿Measurement Circuitry￿= ±15V

 

 

 

VCC

 

VDUT

 

 

 

Adjustable

(2.7V￿to￿5.5V)

Power

(2.7V￿to￿5.5V)

 

 

 

 

 

 

Switched￿Power

 

 

Regulator

 

 

Switching

 

 

 

 

 

 

 

 

 

 

Reference

2x￿16-Bit

2x￿16-Bit

 

 

3.3V

 

Circuits

Delta-Sigma￿ADC

Delta-Sigma￿ADC

 

 

Regulator

 

 

 

 

 

 

 

VS∝C

 

 

4x￿16-Bit

2x￿16-Bit

Board￿Test￿To

V_USB

 

 

String￿DAC

Delta-Sigma￿ADC

3.3V

 

 

5V

 

 

 

 

 

 

 

 

 

 

 

 

TUSB3210

 

 

 

I2C,￿SPI

 

8052 ∝C

 

Buffers and

 

 

with￿USB￿Interface

 

Control￿Bits,￿and

 

Latches

 

 

and￿UART

 

 

Measure￿Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Calibration

 

 

 

Reset Button

 

 

 

EEPROM

 

 

 

and

8Kx8￿Byte

 

 

 

 

 

Power-On￿Reset

EEPROM

USB￿DAQ￿Platform

 

 

 

 

 

 

 

 

Loop-Switching

4mA￿to￿20mA

4mA￿to￿20mA

 

 

 

Circuit

Loop￿Receiver

Receiver

 

Figure 9. Theory of Operation For USB-DAQ-Platform

3PGA309EVM-USB Hardware Setup

The PGA309EVM-USB Hardware setup involves connecting the two halves of the EVM together, applying power, connecting the USB cable, and setting the jumpers. This section covers the details of this procedure.

3.1Electrostatic Discharge Warning

Many of the components on the PBA309EVM-USB are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVM components.

16

PGA309EVM-USB

SBOU084 –February 2010

 

 

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Copyright © 2010, Texas Instruments Incorporated

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Contents PGA309EVM-USB USB-DAQ-Platform Jumper Settings PGA309EVM-USB Hardware Hardware Included with the INA282-286EVMIf You Need Assistance Related Documentation from Texas InstrumentsInformation About Cautions and Warnings PGA309EVM-USB Hardware Setup Theory of Operation for PGA309TestBoard HardwarePGA309TestBoard Connections PGA309TestBoard Schematic Input Circuitry System Setup PGA309TestBoard Schematic Output Circuitry PGA309TestBoard Schematic Sensor Emulator Circuitry PGA309TestBoard Connections to USB-DAQ-Platform and Eeprom PGA309TestBoard Parts List PGA309 Test Board Parts ListJMP1, JMP2, JMP3, JMP4 1 J1 25-Pin Male Dsub PGA309TestBoard Signal Definitions and PinoutsJ1 Pinout 25-Pin Male Dsub 2 J2 25-Pin Female Dsub J2 Pinout 25-Pin Female DsubToPCandPowerSupplies Theory of Operation for USB-DAQ-PlatformElectrostatic Discharge Warning USBDAQPlatformTypical Hardware Connections PGA309EVM-USB Typical Hardware ConnectionsConnecting the Hardware Connecting the Two EVM PCBsConnecting Power Connecting Power to the EVMConnecting the USB Cable to the PGA309EVM-USB Connecting the USB CablePGA309EVM-USB Jumper Settings Default Jumper Settings PGA309TestBoardDefault Jumper Settings USB-DAQ-Platform PGA309TestBoard Jumper Functions GeneralPGA309TestBoard Jumper Functions Miscellaneous Connections PGA309TestBoard Jumper Functions Sensor Emulator SectionUSB-DAQ-Platform Jumper Settings JUMP1 EXTPGA309EVM-USB Software Install Using the PGA309EVM-USB SoftwareOperating Systems for PGA309 Software Starting the PGA309EVM-USB SoftwareRegisters Tab PGA309EVM-USB Software Registers TabEeprom Table Tab PGA309EVM-USB Software Eeprom TabBlock Diagram Tab PGA309EVM-USB Software Block DiagramAuto Calibrate Tab Sensor Definition FunctionsPGA309EVM-USB Software Sensor Emulator Control Panel Tool PGA Setup Functions PGA309EVM-USB Software Auto Calibrate Tab-PGA SetupTwo-Point Calibration and Linearization Functions Temperature Error Compensation Functions Shows the Temperature Error Compensation sub-tabPost Cal Error Check DMM Options PGA309EVM-USB Software Auto Calibrate Tab-DMM OptionsFCC Warning Evaluation Board/Kit Important NoticeEVM Warnings and Restrictions Important Notice

PGA309EVM-USB specifications

The Texas Instruments PGA309EVM-USB is an Evaluation Module designed specifically for the PGA309 Precision Analog Front End (AFE) family. This versatile and powerful device serves various applications in the realm of sensor signal conditioning, particularly for pressure sensors, temperature sensors, and other analog sensors requiring high precision.

One of the main features of the PGA309EVM-USB is its high-performance PGA309 device, which incorporates a programmable gain amplifier (PGA) allowing for flexible signal amplification. The PGA309 has a gain range from 1 to 128, enabling it to adapt to a wide array of sensor types and output levels. This flexibility is crucial for achieving optimal performance in diverse applications.

The module also leverages advanced analog and digital processing technologies, which enhance its capabilities. It integrates an onboard microcontroller, allowing users to easily configure settings, execute control algorithms, and manage data acquisition. The built-in USB interface simplifies the communication with a PC, making it straightforward to control the EVM through intuitive software provided by Texas Instruments.

Another significant characteristic of the PGA309EVM-USB is its highly accurate signal conditioning features, such as offset and gain calibration, which ensure minimized errors and improved measurement reliability. The device supports a variety of digital output configurations, including I2C and SPI, to allow easy integration into different system architectures.

In addition to its robust signal processing core, the PGA309EVM-USB is designed with user-friendly interfaces, making it suitable for both experienced engineers and those new to sensor design. The comprehensive software toolkit offers a graphical user interface (GUI) that enables real-time monitoring and adjustment of parameters, ensuring users can optimize their applications.

Furthermore, the device is designed for functionality in harsh environments, incorporating features to withstand temperature variations and electrical noise. This reliability adds value for applications in industrial automation, automotive systems, and medical devices.

In summary, the Texas Instruments PGA309EVM-USB stands out as a powerful tool for engineers looking to design and prototype high-precision sensor signal conditioning applications. With its programmable gain amplifier, advanced processing capabilities, and user-friendly interfaces, it represents a significant advancement in the field of analog signal processing, allowing for greater flexibility and accuracy in diverse applications.