Replacement for MC68332 at 2022

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Replacement for MC68332 at 2022

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KizoVinh
Contributor I

Our Company are using MC68332 with external FLASH and RAM for collecting data from thermal sensor. The MCU seems obsolete nowadays and we are finding for a replacement. We want to keep the TPU block and high internal SRAM and FLASH for saving space.

The same packaging form LQFP is also good, and we need a product that can be supported for a long term

I see that the TPU block is for timing and scheduling, so can we use another block for that function, cause as I see in a lot of new MCUs on NXP, they doesn't have that block anymore.

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JerryAndrews
Contributor I

Ok, thanks.

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Hui_Ma
NXP TechSupport
NXP TechSupport

Hi,

I could find MPC5xxx MCU product, such as MPC5775B/E product has eTPU (Enhanced Time Processor Unit). 

From NXP product longevity program, the MPC5775B/E product belongs to 15 years longevity program and still keep active until Jun 2033.

Hui_Ma_0-1656901459777.png

The NXP ARM Cortex-M core MCU products do not have TPU/eTPU module, will provide powerful timer module, such as FlexTimer.

Wish it helps.

Mike

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KizoVinh
Contributor I

Thank you sir, the block diagram of the MPC5775 on nxp website doesn't include the eTPU block so i thought this MCU doesn't have this function.


Therefore, can you show me where can i get the longevity years information of the MCU like the picture above

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TomE
Specialist II

> the block diagram of the MPC5775 on nxp website doesn't include the eTPU block

Below the block diagram it says the MPC5775E has THREE of them, as does the Feature Comparison Table.

Going from a 16MHz (or so, could be 25MHz) 68k in a 132 or 144 pin QFP to a chip with THREE PPC cores running at 264MHz in a 416-pin BGA package with 4M of internal Flash and 512k of internal SRAM seems to be a gigantic step up in performance and complexity.

Are you sure your system needs a TPU? It might have only needed it with the speed of the 68332. A more modern and faster CPU might be able to do whatever the TPU was used for in code, and with the help of some modern timers or SPI controllers or something.

The 68332 has a 16-bit bus and takes 3 clocks to read or write instructions and data. So it can only run at about 4 MIPs. The MPC5775E has 32-bit buses and can probably run multi-issue at the full clock rate. As well as having THREE CPUs inside it.

A 60-120MHz ARM chip (like one of the Kinetis ones), see the KL series) might be able to do what the 68k TPU did on its own, and you can get them in an LQFP as well. If you want better longevity, start with something made later, like the LPC550x. An LPC800 might even be able to do it.

Tom

 

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Hui_Ma
NXP TechSupport
NXP TechSupport

Yes, please refer NXP Product Longevity Program for the product longevity info.

Wish it helps.

Mike

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