ST STEVAL-WBC2TX70 - VIN ISNS Routing

ST STEVAL-WBC2TX70

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7.2.5 VIN ISNS routing

The input current is sensed on R300 and the ISNS_N and ISNS_P tracks are routed closely together for an

accurate measurement.

Figure 53. VIN ISNS routing

UM3286

Designing a wireless power transmitter based on STEVAL-WBC2TX70 evaluation board

UM3286 - Rev 1

page 69/84

Table of Contents

Figure 1. STEVAL-WBC2TX70 Evaluation Board1
1 Getting Started2
Table 1. Reference Design Specifications3
2 Reference Design Specifications3
- Figure 2. Board Overview4
- Test Points6
3 Overview of the Board4
- Table 2. Test Points6
- Figure 3. Test Points6
- Basic Operating Modes7
- Status Leds7
- Table 3. Status Leds Meaning7
- Figure 4. Block Diagram8
- Bridge Current Monitor9
- Bridge Voltage Monitor9
- DC-DC Current Monitor9
- Onboard Voltage Sources9
- Ring Voltage Monitor9
- Chip Reset10
- Power up Sequence10
- Protections Overview10
- Uvlo10
- Foreign Object Detection (FOD)11
- EPT Reason12
- WPC Qi Wireless Power Transfer12
  - Baseline and Extended Power Profiles12
4 Device Description and Operation8
- Adc8
- Power Inverter8
- System Block Diagram8
- Bidirectional Communication14
- Figure 7. ASK Timing15
- FSK Communication16
- Table 8. Memory Write Command22
- Table 7. Memory Erase Command22
- Bootloader and Boot Pin23
- Stsafe23
  - STSAFE-A110 for Qi Authentication23
5 Graphical User Interface (GUI)27
- Connecting STWBC2 to the GUI27
- Event Box29
- Rx Information35
- Tx Information35
- Charts Page36
  - Chart Controls and Shortcuts36
6 STEVAL-WBC2TX70 Description44
- Figure 29. STEVAL-WBC2TX70 Circuit Schematic (1 of 6)44
- Schematic Diagrams44
  - Figure 30. STEVAL-WBC2TX70 Circuit Schematic (2 of 6)45
  - STWBC2 Default Configuration57
- Bill of Materials (BOM)49
Figure 47. Thermal Performance63
7 Designing a Wireless Power Transmitter Based on STEVAL-WBC2TX7064
- Evaluation Board64
- BOM Reduction Suggestions64
  - Figure 48. Layer 1 High Power Tracks64
  - Board Input Layout66
- Layout Guidelines64
  - High Power Tracks64
- Ground Plane on Layer 465
- VIN ISNS Routing69
Figure 56. Bridge ISNS Routing71
Figure 57. DC-DC Short Path through Q40471
8 Board Versions72
Table 16. STEVAL-WBC2TX70 Versions72
9 Regulatory Compliance Information73
10 References74
11 Acronyms and Definition75
Table 17. List of Acronyms75
Revision History76
Table 18. Document Revision History76

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