1. At supply voltage VCC_ What is the reason why the output voltage of VDDX is 2.9V (normally 5V) when K is 11.3V and the voltage measured by the Q1 base of the transistor, which is also 11.3V on the 15 pin microcontroller? Can you provide a detailed Block Diagram of the internal LDO of the MCU,For subsequent analysis.
2. How to understand 170mA in the red box?
3. How to correctly understand the red box in the green block diagram?
4.Under what circumstances does the microcontroller enter a low reset? If possible, does the software have registers that can be actively configured?
5. What are the conditions for entering stopmode? The measured VDDX of the faulty component is 2.9V, has it entered the stopmode?
6.Which is the software low-voltage interrupt reset port in this table?
Hello @Caleb1,
1.
It is under discussion in your other thread:
https://community.nxp.com/t5/S12-MagniV-Microcontrollers/S912ZVL64F0VLCR-question/m-p/1706157#M19382
Can you measure the reset pin along with the VSUP and VDDX domains?
I assume the MCU resets periodically at 2.92V VDDX.
The VDDX does not have to be generated using the external ballast transistor.
You can set CPMUVREGCTL = 0x02, to disabled the external and enabled the internal regulator only.
Do you see the same behavior with the internal regulator?
Do you see the issue on more boards or just one?
What is the power consumption of the MCU at VSUP? Can you measure the current there?
Is the MCU heating?
What else is powered from VDDX on the PCB?
2.
That means that the regulator with the external ballast transistor can provide max. 170mA.
3.
This is a write-once register, it can be written only once after each reset.
Table 9-30 shows legal and blocked combination of bits on the write.
4.
The LVR function is always enabled except when the MCU is in the Stop mode.
5.
The MCU enters the Stop mode on execution of the STOP instruction.
6.
Regards,
Daniel
7. From the perspective of faulty components, basically it is the KL15 power on (vehicle key on) stage that causes problems. Is there a requirement for the VSUP power supply voltage to reset the reset pin timing? The product is a battery 12V.
We have replicated the same fault phenomenon twice using laboratory methods. KL15 ON (12.0V)=2 Second; The KL15 OFF time is gradually increased from 170mS to 1mS. When it is increased to 274mS, there is one occurrence, and the fault phenomenon persists for about 20s before self recovery; The second occurrence was KL15 OFF=283mS, and the fault phenomenon remained for about 30 seconds.
8. As we continue to study the manual, there is a parameter that we do not quite understand, specifically as follows.
