TIDUEB8C July   2018  – March 2021 TPS274160

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 LM5165
      2. 2.2.2 TLC59282
      3. 2.2.3 TPS4H160-Q1
      4. 2.2.4 INA253
      5. 2.2.5 TIOL111
    3. 2.3 System Design Theory
      1. 2.3.1 IO-Link PHY
      2. 2.3.2 Current Sink
      3. 2.3.3 Power Supply for L+
      4. 2.3.4 Power Supply
      5. 2.3.5 Pinouts
    4. 2.4 Software Frame Handler
      1. 2.4.1 PRU-ICSS IO-Link Frame-Handler
        1. 2.4.1.1 Performance Advantages and Benefits
        2. 2.4.1.2 Principle of Operation
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Software
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Test Results
        1. 3.2.2.1 IO-Link Wake-Up Pulse
        2. 3.2.2.2 L+ Turnon Behavior
        3. 3.2.2.3 Current Sink on CQ
        4. 3.2.2.4 Residue Voltage
        5. 3.2.2.5 IO-Link Physical Layer Test Summary
        6. 3.2.2.6 Current Sense on Each Port
        7. 3.2.2.7 TPS4H160 Thermal Behavior
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks
  12. 7About the Author
  13. 8Revision History

3.2.2.4 Residue Voltage

The test case TCM_PHYL_INTF_IQPKHM tests the voltage drop on the high side of the IO-Link PHY during the wake-up pulse. Therefore the CQ line is loaded with 26 Ω and the wake-up pulse is generated. The voltage on the CQ line has to exceed 13 V to pass this test. This test is done with a L+ voltage of 20 V and 30 V.

GUID-0ADBB064-6D97-4E5B-9387-A6AB5664B228-low.pngFigure 3-8 Testcase TCM_PHYL_INTF_IQPKHM: Wake-Up Current High Side - 20 V L+ Resulting in 17.4 V
GUID-4E263596-0C4E-43BC-9E0A-377773D254F4-low.pngFigure 3-9 Testcase TCM_PHYL_INTF_IQPKHM: Wake-Up Current High Side - 30 V L+ Resulting in 26.4 V

As Figure 3-8 and Figure 3-9 show, the voltage is above 13 V, so the test of the high-side driver is passed.

The next relevant test case is TCM_PHYL_INTF_IQPKLM. This test is similar than before, but testing the low-side switch. Therefore the load is 24 Ω for 20 V L+ voltage and 44 Ω for 30 V. The resistor must be connected between L+ and CQ to test the low side. The voltage has to be below 8 V to pass this test.

GUID-71FF0DFA-D567-45C0-B0AD-598AC5FD4764-low.pngFigure 3-10 Testcase TCM_PHYL_INTF_IQPKLM: Wake-Up Current Low Side - 20 V L+ Resulting in 2 V
GUID-7547927A-F112-4D23-B786-4E7272FC615F-low.pngFigure 3-11 Testcase TCM_PHYL_INTF_IQPKLM: Wake-Up Current Low Side - 30 V L+ Resulting in 2 V

So all the tests for the current capability during the wake-up pulse are passed.