SPRADA5 April   2024 TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SJ-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Supplementary Information
    2. 1.2 Features
    3. 1.3 Block Diagram
    4. 1.4 Operation Modes
  5. 2Use Cases
    1. 2.1 Buffer Mode for High-Impedance Source
    2. 2.2 Battery Voltage and Current Monitoring
    3. 2.3 Low-Side Shunt Current Monitoring
    4. 2.4 Three-Phase Low-Side Current Sensing
    5. 2.5 Bidirectional Current Sensing
    6. 2.6 Non-Inverting Amplifier for Low-Voltage Sensors
    7. 2.7 Non-Inverting Amplifier for Bipolar Signals
    8. 2.8 Standalone Mode for Various Applications
  6. 3Summary
  7. 4References

1.2 Features

Features available to PGA modules include:

  • Rail-to-rail input and output voltage within VDDA and VSSA range
  • Programmable gain modes, including unity gain and other values from 2X - 64X
  • Standalone gain mode using off-chip passive components
  • Post-gain filtering using on-chip resistors and off-chip capacitor
  • Differential input support
  • Hardware-assisted chopping for offset reduction, which enables higher-precision measurements at low currents and allowing the use of smaller value shunt resistors for improved system efficiency.
  • No PGA_INM pin connection is needed if using the internal connection to VSSA
  • Support for Kelvin ground connections using PGA_INM pins
  • The temperature stability is one of the key advantages of on-chip PGAs over discrete implementations as integrating the amplifier with all the gain-setting resistors enables slight and unified temperature drift.