Renesas P9235A-RB, Layout Manual

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P9235A-RB Layout Guide
© 2019 Integrated Device Technology, Inc. 1 March 19, 2019
Contents
1. Introduction ...................................................................................................................................................................................................2
Key Points for Optimal Layout .............................................................................................................................................................2
2. Tx Power Circuits .........................................................................................................................................................................................3
Resonance Capacitors ........................................................................................................................................................................8
VCC5V V
IN
, VCC5V, LDO33, LDO18, VBRG_IN, PE Circuit and DRV_VIN Pin Capacitors ...............................................................9
Sensitive Circuits ...............................................................................................................................................................................10
Boost Capacitors and Gate Drive Lines.............................................................................................................................................11
5V Step Down Switching Regulator ...................................................................................................................................................12
Flash Circuit .......................................................................................................................................................................................13
3. PCB Footprint Design .................................................................................................................................................................................14
4. Audible Noise Suppression ........................................................................................................................................................................15
5. Schematics, Bill of Materials (BOM), and Board Layout .............................................................................................................................16
6. Revision History ..........................................................................................................................................................................................22
List of Figures
Figure 1. Schematic with Main Power Path (Orange) and Main (Noisy) AC Power Loops (Red) .......................................................................3
Figure 2. Recommended Orientation for the P9235A-RB and Generic Placement Guide for Select Critical Components ................................4
Figure 3. Actual Placement for the P9235A-RB EVK. Select Critical Components are circled in Yellow ...........................................................5
Figure 4. P9235A-RB Physical Layout from P9235A-RB-EVK Evaluation Board (2nd Layer (L1)) ....................................................................6
Figure 5. P9235A-RB Physical Layout from P9235A-RB-EVK Evaluation Board (3rd Layer (L2)) .....................................................................6
Figure 6. P9235A-RB Physical Layout from Demo PCB of Bottom Layer ..........................................................................................................7
Figure 7. Resonance Capacitors ........................................................................................................................................................................8
Figure 8. V
IN
, VCC5V, LDO33, LDO18, VBRG_IN, and DRV_VIN Pin Capacitors Placed Close to P9235A-RB with 0.1µF Placed Closest ..9
Figure 9. P9235A-RB Typical GND Noise Areas and Sensitive Circuit Placement ..........................................................................................10
Figure 10. Boost Capacitors and Gate Drive Lines.............................................................................................................................................11
Figure 11. 5V Step Down Switching Regulator ...................................................................................................................................................12
Figure 12. Flash Circuit .......................................................................................................................................................................................13
Figure 13. P9235A-RB Recommended PCB Land Pattern Drawing ..................................................................................................................14
Figure 14. Application Schematic .......................................................................................................................................................................16
Figure 15. Silkscreen – Top of Board .................................................................................................................................................................19
Figure 16. Copper – Top Layer ...........................................................................................................................................................................19
Figure 17. Copper L1 Layer ................................................................................................................................................................................20
Figure 18. Copper L2 Layer ................................................................................................................................................................................20
Figure 19. Copper Bottom ..................................................................................................................................................................................21