USB "Device-Charge-Detect" feature a mistake?

[brunopaillard]

The on-line (web) documentation about the K22 family indicates that the USB module features "Device-Charge-Detect", but the USB section of the K22F sub-family reference manual says nothing about charge-detect logic. Is this a mistake?

Thanks

Bruno

[Paul_Tian]

Hi, Bruno

Would you please help to show the URL of the document you mentioned? Thanks.

Best Regards

Paul

[brunopaillard]

Hi Paul

Look into http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=K22_120

Open the "Connectivity and Communications" bullet. The first item "USB" says "USB 2.0 On-The-Go (full-speed). Device charge detect optimizes charging current/time for portable USB devices"

I have also seen it at ARM Cortex-M4 Cores|Kinetis K2x MCUs|Freescale

in the intro.

Bruno

[Jorge_Gonzalez]

Hello Bruno:

Sorry for the confusing information you found. Freescale recently launched new K22_120 MHz devices such as the one in FRDM-K22F (K22FN512VLH12). However there were legacy K22_120 MHz devices released a time ago. The info you found about Device Charge Detect only applies for those "old" parts, but we have not updated the info, thank you for reporting this. For details you can check the next product selection guide. Refer to page 9 about K22 parts:

http://cache.freescale.com/files/microcontrollers/doc/selector_guide/KINETISKMCUSELGD.pdf

Regards!,
Jorge Gonzalez

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[brunopaillard]

Hi Jorge

Are those "older" K22_120_MHz devices still available? Can one still design with them?

Charge-Detection is a very useful feature, especially in the applications that we are considering.

Do you know why the old K22 were obsoleted?

[Jorge_Gonzalez]

Hello Bruno:

Yes, those are still available and good for a new design, not obsolete. The new K22_120 MHz just have some changes, such as improved power consumption, crystal-less USB, High Speed Run mode, etc, but you miss peripherals and features like USB Charge Detect, CAN and available Flash/RAM. Let's say new parts are the low end K22_120 while legacy parts are high end. Right now the part numbering is as follows:

New: K22FN512, K22FN256.

Legacy: K22FX512, K22FN1M0.

And as evaluation board, instead of the FRDM-K22F, you would need a TWR-K21F120M.

Regards!,
Jorge Gonzalez

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[brunopaillard]

Thanks again Jorge!

I ordered the TWR-K21F120M devkit.

Thanks

Bruno

[Jorge_Gonzalez]

Good to know Bruno.

I just posted a document explaining the differences I mentioned above. Please notice USB DCD refers to "Device Charge Detect". All K22 devices have USB module.

Here is the link:

Kinetis K22_120 MHz devices

Regards!,
Jorge Gonzalez

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