S32K144H Cannot Establish Connect

[Tom77854]

Hello, guys. 

l am meeting a problem. l have got some new S32K144H chip. It did not work like this when l try to connect it with j-flash. l cannot unlock it with normal methods.

l have never flash it. I heard a statement，like this "When the chip is empty, the RESET pin will exhibit periodic pulses." 

Is it correct? l test my board, reset pin is always high. There is a 5V pull-up on reset. Is this effect my result or this is not a empty chip.  May be others ever flash it?

[lukaszadrapa]

Hi @Tom77854 

Yes, that's correct, empty chip will reset periodically. It was discussed here, for example:
https://community.nxp.com/t5/S32K/S32K144-New-Empty-Chip-Resets-Automatically-in-a-Certain-Period/m-...

The reset signal works as pseudo open drain. Pull-up resistor will not prevent the device to pull the reset pin down. 

So, the chip is probably not empty. If the "unsecuring" does not work, mass erase may be disabled or CSEc may be enabled. In this case, there's no way to recover. 

Do you know history of the chip? If the reset is not toggling, it's not brand new device. 

Regards,

Lukas

[Tom77854]

Thanks for your answer. l will contact supplier.