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AN1690 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN1690 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 15 page ![]() Contents AN1690 2/15 Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Bus states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Data transmission protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Internal fail-safe and bus termination . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 DC terminated fail-safe resistor value calculations . . . . . . . . . . . . . . . . 7 5.1 Example calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 AC terminated fail-safe resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Fail-safe in multipoint transmission buses . . . . . . . . . . . . . . . . . . . . . . 10 8 Fail-safe circuit comparisons with ST485EB . . . . . . . . . . . . . . . . . . . . 11 9 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 |
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