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AN1690 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN1690
Description  Fail-safe biasing for ST485EB
PDF  15 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1690 Datasheet(HTML) 2 Page - STMicroelectronics

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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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