AN4068 Datasheet, PDF (5/63 Pages) STMicroelectronics – ST7580 power line communication system-on-chip design guide

AN4068
List of figures
List of figures
Figure 1. ST7580 reference design board with outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. ST7580 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3. Board drawing with the various sections indicated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 4. Schematics of the ST7580 reference design board (part 1) . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 5. Schematics of the ST7580 reference design board (part 2) . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 6. Line coupling section schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 7. Measured frequency response of the transmission active filter (typical) . . . . . . . . . . . . . . 22
Figure 8. Montecarlo simulation of the transmission active filter frequency response . . . . . . . . . . . . 22
Figure 9. Measured frequency response of the reception passive filter (typical) . . . . . . . . . . . . . . . . 24
Figure 10. Montecarlo simulation of the reception passive filter response . . . . . . . . . . . . . . . . . . . . . 24
Figure 11. Measured frequency response of the transmission line coupling loaded with the EN50065-1
LISN impedance (typical)26
Figure 12. Measured frequency response of the transmission line coupling loaded with 5 W + 15 µF
(typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 13. Montecarlo simulation of the transmission line coupling response loaded with the
EN50065-1 LISN impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 14. Isolated zero crossing coupling circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 15. Zero crossing coupling - positive edge delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 16. Zero crossing coupling - negative edge delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 17. Connections between the STM32F103CBT6 and the ST7580 devices on the
EVALST80-1 board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18. STM32F103CB external connections: schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 19. STM32 configurable signalling LEDs and pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 20. Measured input impedance modulus of the line coupling - reception mode (typical) . . . . . 35
Figure 21. Measured input impedance modulus of the line coupling - transmission mode (typical) . . 35
Figure 22. Conducted emissions test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 23. Conducted emissions: PSK transmission spectrum, peak measurement, 9 kHz - 150 kHz,
line-to-earth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 24. Conducted emissions: PSK transmission spectrum, peak measurement, 9 kHz - 150 kHz,
neutral-to-earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 25. Conducted emissions: PSK transmission spectrum, quasi-peak measurement, 150 kHz -
30 MHz, line-to-earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 26. Conducted emissions: PSK transmission spectrum, quasi-peak measurement, 150 kHz -
30 MHz, neutral-to-earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 27. Conducted emissions: FSK transmission spectrum, peak measurement, 9 kHz - 150 kHz
, line-to-earth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 28. Conducted emissions: FSK transmission spectrum, peak measurement, 9 kHz - 150 kHz,
neutral-to-earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 29. Conducted emissions: FSK transmission spectrum, quasi-peak measurement, 150 kHz -
30 MHz, line-to-earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 30. Conducted emissions: FSK transmission spectrum, quasi-peak measurement, 150 kHz -
30 MHz, neutral-to-earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 31. Common mode disturbance protection - positive disturbance . . . . . . . . . . . . . . . . . . . . . . 41
Figure 32. Common mode disturbance protection - negative disturbance. . . . . . . . . . . . . . . . . . . . . . 42
Figure 33. Differential mode disturbance protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 34. Example of stencil openings for the QFN48 package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 35. PCB copper dissipating area on top layer (left) and bottom layer (right) for the ST7580
reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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