S32K144 application for an ASIL B system

[Alan123]

Hello NXP group,

When designing an ASIL B system, we encountered the following problems:
1. How to report faults detected by the internal safety mechanism of S32K144? Is it through a particular pin? Or the error flag bit of the internal register, if it is an internal register, how should MCAL/SW be configured? Are there any application examples?
2. Is there a clear block diagram for S32K144 internal diagnosis, fault handling and response logic? I don't see it on SM;
3. In addition, for general ASIL B system application, is there any reference example for the circuit diagram of S32K144 base circuit?

[ehtesham_khan]

1. How to report faults detected by the internal safety mechanism of S32K144? Is it through a particular pin? Or the error flag bit of the internal register, if it is an internal register, how should MCAL/SW be configured? Are there any application examples?

• The faults detected by internal safety mechanisms is reported to SW via the status registers. Software can read the failure source (register indicating clock errors, voltage errors) and can do so either before or after a functional reset. If necessary, software can also reset the S32K14x. The EWM_out signal can be used to indicate the erroneous state of MCU.

2. Is there a clear block diagram for S32K144 internal diagnosis, fault handling and response logic? I don't see it on SM;

• The internal diagnosis and fault handling of the different modules are given in the specific section of the safety manual. The overall block diagram can be found in the Chapter 3.1- General Concept of the safety manual

3. In addition, for general ASIL B system application, is there any reference example for the circuit diagram of S32K144 base circuit?

• We are currently working within the NXP to check if there is any reference example.

4. can the error out signal be configured with a specific pin out without SW app?

• Error out pin has to configured by SW only. The GPIO pin can be configured to use as error indication pin by the SW.

5. If use the EWM module, can internal fault reports be configured together in EWM_out pin outputs?

• The SW can be configured to not service the external watchdog in the presence of the fault. In this way the internal fault reports can be configured together in EWM_out pin outputs.

[Alan123]

Add,

4. can the error out signal be configured with a specific pin out without SW app?

5. If use the EWM module, can internal fault reports be configured together in EWM_out pin outputs?