Kinetics selection

[d2014]

I am having trouble selecting the proper Kinetis MCU for evaluation for my new product. I have noticed that the SPI pins are the same as the UART pins. So I need the following connections: 1 or 2 SPI with 7 total CS pins, 2 RS485 UART, USB, DMA, 3.3V, 50+MHz, prefer no BGA package. Application is industrial control.

[anthony_huereca]

Hi David,

  Have you checked out the MCU solution advisor? For certain devices it'll even do the pin muxing solving for you http://freescale.transim.com/solutionadvisor/SolutionAdvisor.aspx?t=features

  Mark has good suggestions as well, those should fit your needs well.

-Anthony

[mjbcswitzerland · Accepted solution]

David

I would start looking at the K20DX256x7 (as on the TWR-K20D72M)

- USB

- 2 SPIs

- 6 UARTs

There are a number of alternative pin mux options for these so you should have no problems finding the combination that you need

- 72MHz

- 100 pin LQFP

Then you could optimise on the package if needed (there are variations with less pins) and possibly on the peripherals (such as the K21 or K22) or choose parts with mort or less FLASH/RAM, max frequency or FPU.

Regards

Mark