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Texas Instruments PGA900 Programmable Resistive Sensing Conditioner

Texas Instruments PGA900 Programmable Resistive Sensing Conditioner that can accommodate various sensing element types. The PGA900 conditions its input signals by amplification and digitization through two analog front end channels. User programmed software in the on-chip ARM Cortex-M0 processor allows many different functions. It can perform linearization, temperature compensation, and other user defined compensation algorithms. The conditioned signal can be output as ratiometric voltage, absolute voltage, 4- to 20mA current loop or PWM. The data and configuration registers can also be accessed through SPI, I2C, UART, and two GPIO ports. In addition, the unique OWI allows communication and configuration through the power supply pin without using additional lines.

Features

  • High-accuracy, low noise, low power, small size resistive sensing signal conditioner
  • User-programmable temperature and non-linearity compensation
  • On-Chip ARM® Cortex® M0 microprocessor allows users to develop and implement calibration software
  • One-Wire interface enables the communication through power supply pin without using additional lines
  • On-Chip power management accepts wide power supply voltage from 3.3V to 30V
  • Operating temperature range: -40°C to 150°C
  • Memory:
    • 8KB software memory
    • 128 Bytes EEPROM
    • 1KB Data SRAM
  • Accommodates sensor sensitivities from 1mV/V to 135mV/V
  • Two individual Analog-Front-End (AFE) chains, each including:
    • Low noise programmable gain amplifier
    • 24-bit sigma-delta Analog-to-Digital Converter
  • Built-in internal temperature sensor with an option to use an external temperature sensor
  • 14-bit DAC with a programmable gain amplifier
  • Output options:
    • Ratiometric and absolute voltage output
    • 4- to 20mA current loop interface
    • One-Wire Interface (OWI) over power line
    • PWM output
    • Serial Peripheral Interface (SPI)
    • Inter-Integrated Circuit (I2C)
  • Depletion MOSFET gate driver
  • Diagnostic functions

Applications

  • Pressure sensor transmitter
  • Transducer
  • Liquid level meter
  • Flow meter
  • Weight scale
  • Load meter
  • Strain gauge
  • Thermocouple
  • Thermistor
  • 2-Wire Resistance Thermometer (RTD)
  • Resistive field transmitter

Simplified Block Diagram

Block Diagram - Texas Instruments PGA900 Programmable Resistive Sensing Conditioner

Additional Resources

Inilathala: 2015-08-12 | Na-update: 2023-10-31