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Relay Fault Detection with the PIC16F15245 and the Functional Safety Class B Libraries
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PIC16F15244
PIC16F15245
Introduction
1
Failure Modes
1.1
Relay Failures
1.2
Drive Transistor Failure
1.3
Microcontroller Monitoring
2
Software Design
2.1
Relay States
2.2
Error Monitoring
2.3
Voltage Monitoring
2.4
Periodic Self-Tests
3
Implementation
3.1
Voltage Divider
3.2
Setting the Software Parameters
3.3
Design Variations
4
Conclusion
5
Revision History
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