About replacing the new U2 problem in teensy 4.1

[Shun]

If I want to replace the old U2 with a new one, what preparatory steps do I need to take?
As far as I know, U2 is responsible for assisting U1 with functions such as initialization and programming.




thanks

 

[jmarsh]

You can order one from PJRC: https://www.pjrc.com/store/ic_mkl02_t4.html
Why exactly would you want to replace the old one?

 

[PaulStoffregen]

Don't do this. U1 and U2 pair with each other using a unique serial number. If you use a different U2 chip with the original U1 chip, the results can be unpredictable. It might work sometimes, might fail other times. Swapping the U2 chip is absolutely outside of what's supported. A brand new U2 chip purchased from PJRC is meant to be paired with a brand new U1 chip. Once paired, those 2 chips are meant to be forever used together, never swapped with any other chips.

 

[Shun]

We want to replace the U1 from MIMXRT1062DVJ6B to MIMXRT1062CVJ5B to achieve higher temperature resistance.

 

[Shun]

Don't do this. U1 and U2 pair with each other using a unique serial number. If you use a different U2 chip with the original U1 chip, the results can be unpredictable. It might work sometimes, might fail other times. Swapping the U2 chip is absolutely outside of what's supported. A brand new U2 chip purchased from PJRC is meant to be paired with a brand new U1 chip. Once paired, those 2 chips are meant to be forever used together, never swapped with any other chips.

We want to replace the U1 from MIMXRT1062DVJ6B to MIMXRT1062CVJ5B to achieve higher temperature resistance.

Is there another solution if we want to accomplish this?

 

[defragster]

Is there another solution if we want to accomplish this?

If you start with a fresh U1 and a PJRC U2 then it should work as @PaulStoffregen posted.

The SDRAM thread boards have been built using the xxxCVL5B chips with the PJRC U2 and they work.

https://forum.pjrc.com/index.php?threads/call-to-arms-teensy-sdram-true.73898/post-346097

 

[Shun]

If you start with a fresh U1 and a PJRC U2 then it should work as @PaulStoffregen posted.

The SDRAM thread boards have been built using the xxxCVL5B chips with the PJRC U2 and they work.

https://forum.pjrc.com/index.php?threads/call-to-arms-teensy-sdram-true.73898/post-346097

So, is the MKL02 purchased from the PJRC official website pre-programmed, or can the NXP original version be used as is?

 

[defragster]

MKL02 purchased from the PJRC official website pre-programmed

Only this version from PJRC is usably programmed to make a 'Teensy bootloader' based device.