TIDUFE3 July   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS7A03
      2. 2.3.2 REF35
      3. 2.3.3 TVS3301
      4. 2.3.4 OPA391
      5. 2.3.5 AFE881H1
      6. 2.3.6 AFE882H1
      7. 2.3.7 SN74LV8T165
      8. 2.3.8 TMUX1219
  9. 3System Design Theory
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Test Setup
    3. 4.3 Test Results
      1. 4.3.1 Linearity Tests
        1. 4.3.1.1 Linearity Tests Summary
      2. 4.3.2 Noise Tests and Current Histogram
        1. 4.3.2.1 Noise Tests and Current Histogram Summary
      3. 4.3.3 Step Response
        1. 4.3.3.1 Step Response Summary
      4. 4.3.4 Start-Up
      5. 4.3.5 MCU Current
        1. 4.3.5.1 MCU Current Summary
      6. 4.3.6 System Currents
        1. 4.3.6.1 Summary of System Currents
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Layout Prints
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

4.1 Hardware Requirements

To get the board working, the right connections must be made and the jumpers must be set accordingly. Figure 4-1 shows the TIDA-010982 jumpers and Table 4-1 gives a short description of the jumpers and connectors.

TIDA-010982 TIDA-010982 Jumpers Figure 4-1 TIDA-010982 Jumpers
Table 4-1 Jumper and Connector Descriptions
DESIGNATOR JUMPER, CONNECTOR DESCRIPTION
J1 MCU Connector Connection to microcontroller board
J5 Short VDD to PVDD If using AFE881H1 with 1.8V this needs to be shorted, disabling the internal LDO
J7 Enable internal VREF Setting this enables the internal reference voltage of AFE881H1 or AFE882H1
J3 VREF select Set to 1-2 to use onboard REF35125. Set to 2-3 to use external reference voltage provided over MCU connector J1.
J6 IOVDD select Set to 1-3 for 3.3V operation and 3-5 for 1.8V
J6 PVDD select Set to 2-4 for 3.3V operation and 4-6 for 1.8V
J8 Reduce sense resistor Reduces feedback resistor for voltage current translation. For 1.8V operation this jumper needs to be set.
J4 Enable 1.8V regulator Set this jumper to enable 1.8V LDO
J2 Loop Connector Connect to current loop

For different operating voltages, the jumpers need to be set different in order not to damage the devices. Figure 4-2 shows how to set the jumpers for 1.8V operation. Figure 4-3 shows the jumper configurations for 3.3V operation. The red boxes show how the jumpers need to be set for 3.3V operation.

TIDA-010982 TIDA-010982 Jumper Configurations for 1.8V Operation Figure 4-2 TIDA-010982 Jumper Configurations for 1.8V Operation
TIDA-010982 TIDA-010982 Jumper Configurations for 3.3V Operation Figure 4-3 TIDA-010982 Jumper Configurations for 3.3V Operation

The connector J1 connects to an MCU board, Table 4-2 shows the pinout. Pin one is marked on the PCB.

Table 4-2 J1 Connector Pinout
PIN SIGNAL
1 GND
2 VDD-3V3
3 VREF_EXT
4 VDD-1V8
5 ID0
6 SCLK
7 Not used
8 SDI
9 Not used
10 SDO
11 ALARM
12 CS
13 CD
14 DAC_HART_RX
15 RTS
16 DAC_HART_TX