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I/O Expander Functional Safety

I/O Expander Functional Safety Solutions for Critical Applications

The increasing complexity of functions in today’s cars is highlighting the importance of functional safety standards. Safety-related systems in modern cars need robust and dependable electronic components. The safety risks resulting from random hardware failures or systematic hardware/software errors must be reduced as far as reasonably practicable throughout the product’s foreseeable lifetime.

Guidelines and standards have been developed for the process, the technology and the methods used for implementing functional safety in embedded designs. The aim of the functional safety standards is to prevent unacceptable risks that arise from malfunctions in electrical or electronic systems such as safety-critical systems that require safe I/O functionality. Implementing robust safety measures in these systems can dramatically reduce the risk of incorrect behavior in any applications.

Functional Safety Documentation

Functional safety documentation for the devices listed below is available on our purchasing portal.

System Reset, Detect and Manage

Feature MCP23017
MCP23S17		 MCP23018
MCP20S18		 MCP23009
MCP23S09		 Fault Prevention Self Diagnostic System Diagnostic Fault Mitigation
Power-on Reset (POR) ● ● ●     ✔ ✔
VDD Input Undervoltage ● ● ● ✔      

GPIO ESD Protection

Feature MCP23017
MCP23S17		 MCP23018
MCP23S18		 MCP23009
MCP23S09		 Fault
Prevention		 Self
Diagnostic		 System
Diagnostic		 Fault
Mitigation
ESD Protection ● ● ● ✔      
I/O Port Readback ● ● ●   ✔ ✔  

For additional information about our functional safety-enabled products and supporting documentation, please visit our Functional Safety page.

Legend:
● Available in all devices
○ Available in some devices
✔ Functional Safety Feature Available
- Not Available
 		 Definitions:
Fault Prevention - Silicon feature that prevents damage, unintended configuration changes or invalid operation
Self-Diagnostic - Silicon/software feature that identifies if the silicon is working as it should be
System Diagnostic - Silicon/software feature that identifies if the system is working as it should be
Fault Mitigation - Silicon feature that can be used by the system to transition to a safe state after a fault is detected

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