SPRACZ9A November   2021  – December 2022 TMS320F2800132 , TMS320F2800133 , TMS320F2800135 , TMS320F2800137 , TMS320F2800152-Q1 , TMS320F2800153-Q1 , TMS320F2800154-Q1 , TMS320F2800155 , TMS320F2800155-Q1 , TMS320F2800156-Q1 , TMS320F2800157 , TMS320F2800157-Q1 , TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280033 , TMS320F280034 , TMS320F280034-Q1 , TMS320F280036-Q1 , TMS320F280036C-Q1 , TMS320F280037 , TMS320F280037-Q1 , TMS320F280037C , TMS320F280037C-Q1 , TMS320F280038-Q1 , TMS320F280038C-Q1 , TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

 

  1.   Hardware Design Guide for F2800x Devices
  2.   Trademarks
  3. 1Introduction
  4. 2Typical F2800x System Block Diagram
  5. 3Schematic Design
    1. 3.1 Package and Device Decision
      1. 3.1.1 F2800x Devices
        1. 3.1.1.1 TMS320F28004x
        2. 3.1.1.2 TMS320F28002x
        3. 3.1.1.3 TMS320F28003x
        4. 3.1.1.4 TMS320F280013x
      2. 3.1.2 Migration Guides
      3. 3.1.3 PinMux Tool
      4. 3.1.4 Configurable Logic Block
    2. 3.2 Digital IOs
      1. 3.2.1 General Purpose Input/Outputs
      2. 3.2.2 Integrated Peripherals and X-BARs
      3. 3.2.3 Control Peripherals
      4. 3.2.4 Communication Peripherals
      5. 3.2.5 Boot Pins and Boot Peripherals
    3. 3.3 Analog IOs
      1. 3.3.1 Analog Peripherals
      2. 3.3.2 Choosing Analog Pins
      3. 3.3.3 Internal vs. External Analog Reference
      4. 3.3.4 ADC Inputs
      5. 3.3.5 Driving Options
      6. 3.3.6 Low-Pass/Anti-Aliasing Filters
    4. 3.4 Power Supply
      1. 3.4.1 Power Requirements
      2. 3.4.2 Power Sequencing
      3. 3.4.3 VDD Voltage Regulator
        1. 3.4.3.1 Internal vs. External Regulator
        2. 3.4.3.2 Internal LDO vs. Internal DC-DC Regulator
      4. 3.4.4 Power Consumption
      5. 3.4.5 Power Calculations
    5. 3.5 XRSn and System Reset
    6. 3.6 Clocking
      1. 3.6.1 Internal vs. External Oscillator
    7. 3.7 Debugging and Emulation
      1. 3.7.1 JTAG/cJTAG
      2. 3.7.2 Debug Probe
    8. 3.8 Unused Pins
  6. 4PCB Layout Design
    1. 4.1 Layout Design Overview
      1. 4.1.1 Recommend Layout Practices
      2. 4.1.2 Board Dimensions
      3. 4.1.3 Layer Stack-Up
    2. 4.2 Recommended Board Layout
    3. 4.3 Placing Components
      1. 4.3.1 Power Electronic Considerations
    4. 4.4 Ground Plane
    5. 4.5 Analog and Digital Separation
    6. 4.6 Signal Routing With Traces and Vias
    7. 4.7 Thermal Considerations
  7. 5EOS, EMI/EMC, and ESD Considerations
    1. 5.1 Electrical Overstress
    2. 5.2 Electromagnetic Interference and Electromagnetic Compatibility
    3. 5.3 Electrostatic Discharge
  8. 6Final Details and Checklist
  9. 7References
  10. 8Revision History

3.3.3 Internal vs. External Analog Reference

The ADCs onboard use VREFHIx and VREFLOx as voltage references. For most applications, the internal voltage references offer sufficient performance. The VREFHIx pin voltage is thus driven by an internal bandgap voltage reference whose voltage can be selected as a 1.65 V output (0 V to 3.3 V) or a 2.5 V output (0 V to 2.5 V). If even more accuracy is a design requirement for the system being implemented, then an external reference voltage can be used instead.

When using the internal reference mode, no additional voltage sources should be placed on the VREFHI pin as the voltage is driven onto this pin by the device itself. In external reference mode, externally drive the high reference voltage pin using an external circuit, such as REF3030 and high-speed operational amplifier. This voltage must be 2.4 V to VDDA. In all instances, ensure a 2.2 µF capacitor is placed on the pin.

GUID-20211108-SS0I-D3DZ-WPLW-LWSSMWRSDS8F-low.png Figure 3-7 Reference Circuitry for External Analog Reference