NXP S32M276CHABMKHSR Structure question Hi NXP technician, This is Ted from Melecs Wuxi, nice to contact you. I have one question about the structure of S32M276 IC. ( pls. refer to the attached file: Schematic- S32M276). I did the design as datasheet recommendation, connect the 9pin-VDD_AE10, 12pin,25pin,37pin-VDD_HV_A together with beads. from my understanding, 9pin-VDD_AE10 P5V output voltage is generated by internal regulator, then supply the MCU-die on VDD_HV_A pin. But I removed L300, and after that, the PCBA could still working as normal. So my question is that the VDD_AE10 pin and VDD_HV_A pin are internally connected together? Otherwise, after removing L300 system still work, which does not make sense.. Re: NXP S32M276CHABMKHSR Structure question Hi Ted,
When L300 is removed, what voltage do you measure on VDD_HV_A?
The MCU-side power supply domain VDD_HV_A is likely powered through the GPIOs that are shared between the MCU and the AE side, because all GPIOs are clamped to VDD_HV_A. In other words, VDD_HV_A can be powered through any pin if the voltage on that pin is greater than VDD_HV_A. You should therefore measure approximately VDD_HV_A = VDD_AE10 - Vf, not VDD_HV_A = VDD_AE10.
Thank you,
BR, Daniel
Re: NXP S32M276CHABMKHSR Structure question Hi Daniel, Thanks for your reply. 1, So it means that the VDD_AE10 and VDD_HV_A are internally connected? And I could not understand the meaning of this sentence [And you should measure VDD_AE10 - Vf on VDD_HV_A - this can damage the device.] If you could give me some more explanation. Re: NXP S32M276CHABMKHSR Structure question Hi Ted,
The AE die generates VDD_AE10. On the AE side, VDD_AE10 is the power supply of the AE ports, all the ports are clamped to VDD_AE10. On the MCU side, VDD_HV_A is the power supply of the MCU ports, all the ports are clamped to VDD_HV_A. These two dies are interconnected.
If the input voltage on any MCU port is higher than VDD_HV_A + Vf of the clamp, the VDD_HV_A domain is going to be powered by the injected current. And you should measure VDD_AE10 - Vf on VDD_HV_A - this can damage the device.
Regards, Daniel
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